| 吉岡 宏晃（よしおか ひろあき） | データ更新日：2024.04.20 |
准教授 ／
システム情報科学研究院
情報エレクトロニクス部門
| 1. | Hiroshi Yamagishi, Keitaro Fujita, Junnosuke Miyagawa, Yuya Mikami, Hiroaki Yoshioka, Yuji Oki, Naoki Takada, Soumei Baba, Shimpei Saito, Satoshi Someya, Zhan-Hong Lin, Jer-Shing Huang, Yohei Yamamoto, Pneumatically Tunable Droplet Microlaser, LASER & PHOTONICS REVIEWS, 10.1002/lpor.202200874, 17, 5, 2023.05. |
| 2. | Nasim Obata, Yuya Mikami, Hiroaki Yoshioka, Yuji Oki, Embedding Optical Microcavities in Nanoporous SiO2 Film via Infill Inkjet Printing, Advanced Photonics Research, 10.1002/adpr.202200018, 2200018, 2022.05, ナノシリカ粒子を堆積させたナノポーラスフィルムに有機ポリマー溶液を浸透させマイクロ光学構造を実装するインフィル印刷法に関する研究である。. |
| 3. | Daichi Takagoshi, Keisuke Nakakubo, Yuya Mikami, Yushi Yoshioka, Nasim Obata, Takuji Kotani, Hiroaki Yoshioka, and Yuji Oki, Regenerative DFB Lasing From new Silicone Elastomer Waveguide for Printable and Imprintable Optics Fabrication, 2022 Conference on Lasers and Electro-Optics, CLEO 2022 - Proceedings, 2022.05. |
| 4. | Junfeng Zhu, Lei Wan, Chenxi Zhao, Weiping Liu, Yuji Oki, and Hiroaki Yoshioka, Narrow-bandpass transparent/diffusing materials using soft scattering based on dispersed refractive index difference, OPTICAL MATERIALS EXPRESS, 10.1364/OME.447592, 12, 2, 738-750, 2022.02. |
| 5. | Keisuke Nakakubo, Daichi Takagoshi, Yuya Mikami, Hiroaki Yoshioka, Takuji Kotani, and Yuji Oki, Solid phase dye molecular dispersion property of PDMS-based thermoplastic elastomer, Optical Materials Express, 10.1364/OME.446342, 12, 1, 196-203, 2022.01. |
| 6. | Yuya Mikami, Hiroaki Yoshioka, Nasim Obata, Sangmin Han, and Yuji Oki, Polarization-dependent refractive index analysis for nanoporous microcavities by ray tracing of a propagating electromagnetic field, Optical Materials Express, 10.1364/OME.434394, 11, 9, 2924-2937, 2021.08, 有機無機ハイブリッド材料における基礎的な屈折率のふるまいを明らかにするために、ナノシリカ粒子凝集体を用いてFDTD法によりs、p偏光それぞれにおける斜入射光のふるまいを詳細に解析した。その結果、s、p偏光それぞれで遮蔽効果を受ける割合が異なることが分かり、偏光状態で実効的な屈折率が異なることを明らかにした。また、実際にナノシリカ粒子凝集体を用いた印刷マイクロディスクのＷＧＭレーザー発振も行った。. |
| 7. | Wey Yih Heah, Hiroshi Yamagishi, Keitaro Fujita, Megumi Sumitani, Yuya Mikami, Hiroaki Yoshioka, Yuji Oki and Yohei Yamamoto, Silk fibroin microspheres as optical resonators for wide range humidity sensing and biodegradable lasers, Materials Chemistry Frontiers, 10.1039/D1QM00451D, 5, 5653-5657, 2021.08. |
| 8. | Keisuke Nakakubo, Hiroaki Yoshioka, Kinichi Morita, Ryoichi Ishimatsu, Abolfazl Kiani, Hans Hallen, Michael D. Dickey, and Yuji Oki, Dynamic control of reflective/diffusive optical surfaces on EGaIn liquid metal, OPTICAL MATERIALS EXPRESS, 10.1364/OME.425432, 11, 7, 2099-2108, 2021.07. |
| 9. | Junfeng Zhu, Lei Wan, Chenxi Zhao, Ryo Sakai, Yuya Mikami, Tianhua Feng, Cong Chen, Weiping Liu, Hiroaki Yoshioka, Zhaohui Li, and Yuji Oki, Tunable and flexible deep-ultraviolet bandpass filters based on micro- and nanoparticle/polydimethylsiloxane hybrid membranes, OPTICAL MATERIALS, 10.1016/j.optmat.2021.111073, 115, 2021.05. |
| 10. | Junfeng Zhu, Chenxi Zhao, Ryo Sakai, Hiroaki Yoshioka, Yuji Oki, The particle size distribution influence on the spectroscopic performance of CaF2 dispersed PDMS hybrid materials, Proc. SPIE, 10.1117/12.2581237, 11682, 116821I, 2021.03, [URL], A novel UV transparent visible scattering spectroscopic material based on refractive index matching by dispersing specific CaF2 particles into the PDMS matrix was proposed. This hybrid material can be used to develop a UV bandpass filter that showed high transmittance around 260-280 nm and wider bandwidth in the UV region. Furthermore, micro-CaF2 particle size with narrower size distribution that can be fabricated by grinding, precipitation, and centrifugal separation, showed narrower bandwidth of transmittance spectra after dispersing in the PDMS matrix.. |
| 11. | Keisuke Nakakubo, Hiroki Inoue, Hiroaki Yoshioka, Kinichi Morita, Takuji Kotani, Yuji Oki, Flexible waveguides composed of PDMS based elastomer by pen-drawing technique for printable optics, Proc. SPIE, 10.1117/12.2582700, 11682, 116820J, 2021.03, [URL], Super-PDMS with solvent dispersibility promises flexible PDMS-based waveguides in both the cladding and the core. The PDMS can fabricate a micro ~ submicron scale structure easily like waveguide by wet process, as oppose to conventional PDMS which uses imprinting to create microstructures. The refractive index of the PDMS is about 0.1 higher than that of conventional one. Super PDMS solutions dispersed in 1,2 dichloroethane solvent maintained transparent crystals in spontaneous drying after drawing, even at a high concentration of 15 wt.%. A flexible PDMS waveguide with a conventional PDMS cladding and a super PDMS core propagated light even with a waveguide bend radius of 2.5 mm, which is smaller than the minimum bend radius of a typical optical fiber.. |
| 12. | Junfeng Zhu, Ryo Sakai, Chenxi Zhao, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki, Development of ultraviolet down conversion filters based on scattering filter materials, 2020 Conference on Lasers and Electro-Optics, CLEO 2020 2020 Conference on Lasers and Electro-Optics, CLEO 2020 - Proceedings, 10.1364/CLEO_AT.2020.JTu2F.6, 2020.05, [URL], We proposed a novel ultraviolet down conversion filter. It is mainly fabricated based on our scattering filtering materials that can show transparency at specific ultraviolet wavelength owing to refractive index matching.. |
| 13. | A. Nasir, Y. Mikami, T. Takagishi, R. Yatabe, H. Yoshioka, N. Vasa, and Y. Oki, Effect of Edge Angle of Ink-Jet Printed Microdisk Lasers on Mode Shift Due to Protein Adsorption, 2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020, 2020.08. |
| 14. | Y. Mikami, H. Yoshioka, N. Obata, T. Takagishi, S. Han, and Y. Oki, Broadly Refractive Index Design for Porous Microdisk by Tuning Nano-porous Structure, 2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020, 2020.08. |
| 15. | N. Obata, Y. Mikami, T. Takagishi, H. Yoshioka, and Y. Oki, Direct-printing Method of Waveguide and Flow-channel on Transparent Nano-porous SiO2 Film, 2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020, 2020.08. |
| 16. | Abdul Nasir, Yuya Mikami, Taku Takagishi, Rui Yatabe, Hiroaki Yoshioka, Nilesh J. Vasa, Yuji Oki, Fully room temperature bio-sensing using active microdisk fabricated by ink-jet printing method, 2020 Conference on Lasers and Electro-Optics, CLEO 2020 2020 Conference on Lasers and Electro-Optics, CLEO 2020 - Proceedings, 10.1364/CLEO_AT.2020.AW3K.5, 2020.05, [URL], Fluorinated hyper branched polymer based active microdisk was fabricated by ink-jet printing method. The carboxyl functional group of the polymer was used for the biotinylation of microdisk and then adsorption characteristics of avidin were evaluated.. |
| 17. | Abdul Nasir, Yuya Mikami, Rui Yatabe, Hiroaki Yoshioka, Nilesh Vasa, and Yuji Oki, Fully room temperature and label free biosensing based on an ink-jet printed polymer microdisk laser, OPTICAL MATERIALS EXPRESS, 10.1364/OME.415000, 11, 3, 592-602, 2021.03, Materials with biomolecule-compatible functional groups are desirable for the fabrication of microdisk lasers used in bio-sensing applications. In this study, a microdisk laser was fabricated using a low-viscosity hyper branched polymer FC-V-50 using ink-jet printing, and was surface-modified at room temperature within a relatively short time compared to conventional methods. The carboxyl functional group of the FC-V-50 polymer was used for surface modification and biotinylation. The adsorption characteristics of the microdisk laser were evaluated using bovine serum albumin, avidin, and streptavidin. This study reports the first demonstration of label-free biosensing using the FC-V-50 polymer-based microdisk laser.. |
| 18. | Abdul Nasir, Rui Yatabe, Yuya Mikami, Hiroaki Yoshioka, Nilesh Vasa, Yuji Oki, Ink-jet printed, blended polymer-based microdisk resonators for controlling non-specific adsorption of biomolecules, OPTICS LETTERS, 10.1364/OL.412993, 46, 2, 262-265, 2021.01. |
| 19. | Harunobu Takeda, Hiroaki Yoshioka, Hiroaki Minamide, Yuji Oki, Chihaya Aadachi, 0.5–4.5THz band terahertz spectroscopy of thermally activated delayed fluorescence molecules, Optics Communications, 10.1016/j.optcom.2020.126339, 476, 2020.12, [URL], In this work we performed an expanded THz range spectroscopic analysis of organic electroluminescence chromophores; specifically the thermally activated delayed fluorescence (TADF) compounds 4,5-bis(carbazol-9-yl)-1,2-dicyanobenzene (2CzPN), 2,3,5,6-tetrakis(carbazol-9-yl)-1,4-dicyanobenzene (4CzTPN) and 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) as amorphous powders. THz parametric oscillator, injection seeded THz parametric generator, THz time-domain and Fourier transform infrared spectroscopy techniques were all used to assess these compounds over the frequency ranges of 0.50–4.5 and 18–54THz. The resulting experimental spectra were compared with the results of density functional theory (DFT) calculations at the M06-2X/6-31G(d,p) level of theory. THz absorption bands in the experimental spectra were found to be very weak because of the lack of crystallinity in these specimens, even though the DFT calculations predicted absorbance in the THz range. Based on the DFT results, the absorbance lines that were observed are attributed to the wagging, rocking, rotational and out-of-plane bending motions of the carbazole moieties.. |
| 20. | Taku Takagishi, Hiroaki Yoshioka, Yuya Mikami, Yuji Oki, On-demand inkjet-printed microdisk laser with air cladding by liquid flow microetching, Applied Optics, 10.1364/AO.396061, 59, 21, 6340-6346, 2020.07, [URL], We have novelly, to the best of our knowledge, developed the liquid flow microetching method that can treat a single microdisk in a microregion with precise position control for inkjet-printed microdisk lasers. The injection-drain wet etching setup consisted of two microneedles that successfully performed a formation of a fine undercut structure of an inkjet-printed microdisk on a pre-pedestal layer through the individual wet etching process. Then measurement of the undercut structure using scanning electron microscopy and lasing characteristics with whispering gallery modes were carried out to demonstrate performance of the etched microdisks. The measured lasing threshold decreased by half compared with that of the unetched microdisk directly printed on a fluorine-type film. A point to note is that this etching method exhibits an excellent undercut and lasing characteristics even when using a clad pre-pedestal layer having a refractive index higher than that of core microdisks. This technique, combined with inkjet printing, offers a powerful tool for individually designing a microdisk and can help develop novel devices that comprise several inkjet-printed microdisks being evanescently coupled.. |
| 21. | Chacriya Malasuk, Ryoichi Ishimatsu, Kinichi Morita, Hiroaki Yoshioka, and Yuji Oki, Flow-through optical device based on silicone optical technology (SOT) for determination of iron in drinkable tap water, Microchemical Journal, https://doi.org/10.1016/j.microc.2020.104897, 157, 104897, 2020.05, [URL]. |
| 22. | K.T. AbdulNasir, Yuya Mikami, Taku Takagishi, Hiroaki Yoshioka, Rui Yatabe, Nilesh J. Vasa, Yuji Oki, Mode shift by adsorption of avidin coated on biotinylated microdisk laser printed by ink-jet technique, レーザー学会研究会報告 = Reports the on topical meeting of the Laser Society of Japan, 19, 46, 5-9, 2019.12. |
| 23. | C. Malasuk, K. Nakakubo, R. Ishimatsu, Y. Nakashima, H. Yoshioka, K. Morita, Y. Oki, Compact and on-demand 3D-printed optical device based on silicone optical technology (SOT) for on-site measurement Application to flow injection analysis, Review of Scientific Instruments, 10.1063/1.5118812, 90, 10, 2019.10, [URL], The current trend for analytical systems and devices is to be small, portable, and low in cost because of the flexibility required to ensure their availability for on-site measurement applications. Using the concept of silicone optical technology (SOT), we propose a fully flexible analytical system, and digital fabrication of a compact optical module for flow-injection analysis (FIA) is demonstrated. A simple structure composed of a transparent polydimethylsiloxane (PDMS) optical core with a carbon black-dispersed PDMS cladding acts as a tiny but straightforward optical filter and shows an ability to trap light at tilted incidence; this structure is embedded on a silicone 3D-printed optical module via a simple injection and coating method. The coating properties, the optical trapping performance, and the cross talk test performance of the device were evaluated. The SOT-FIA optical module successfully demonstrated a 99.8% undesired light trapping performance; cross talk of less than 0.5% was observed, illustrating the low-noise detection performance of the SOT-FIA optical system. Colorimetric determination of iron in natural water samples demonstrated excellent linearity, a wide chemical analysis range, and good percentage recovery performance. The results of the determination in real water samples using the proposed SOT-FIA optical device agreed well with the results from the conventional spectrophotometric method. With advantages that include simplicity, low cost, flexibility, portability, and high sensitivity, the proposed optical device will be potentially useful for on-site chemical analysis measurements.. |
| 24. | Taku Takagishi, Hiroaki Yoshioka, Yuya Mikami, Naoya Nishimura, Yuji Oki, Improvement of lasing threshold of ink-jet printed polymeric microdisk cavity by precise controlled wet etching, 2019 Conference on Lasers and Electro-Optics, CLEO 2019 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings, 10.23919/CLEO.2019.8749640, 2019.05, [URL], With well-controlled wet etching process, under-cut structure of ink-jet printed microdisk was successfully formed and we succeeded in lowering the lasing threshold by 10 times, compared with the one on a substrate.. |
| 25. | Chacriya Malasuk, Keisuke Nakakubo, Shota Tsuru, Hiroaki Yoshioka, Kinichi Morita, Yuta Nakashima, Yuji Oki, Silicone Optical Technology Quasi Spatial Filter and its Application for Multichannel Absorption Analysis, 2018 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2018 2018 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2018, 2019.04, Quasi spatial filter was purposed based on silicone optical technology (SOT). A simple structure as coaxial combination of a transparent polydimethylsiloxane (PDMS) core and carbon/PDMS clad was developed and then applied for multichannel absorption analysis.. |
| 26. | Harunobu Takeda, Michika Takeda, Hiroaki Yoshioka, Hiroaki Minamide, Yuji Oki, Chihaya Adachi, Fluorescence lifetime elongation of thermally activated delayed fluorescence 4CzIPN molecules with encapsulation into zeolitic imidazole frameworks ZIF-11, Optical Materials Express, 10.1364/OME.9.001150, 9, 3, 1150-1160, 2019.03, [URL], Encapsulation of fluorescent directives "thermally activated delayed fluorescence" molecules into a zeolitic imidazole frameworks was proposed, and 4CzIPN molecules were successfully encapsulated into ZIF-11 pores by one step process with a loading efficiency of 0.064 of the proportion of 4CzIPN/ZIF-11. Some Spectroscopic studies such as XRD, UV-Vis, FTIR, THz-TDS and time resolved streak measurement, and the suppression of intramolecular vibrational, rotational and librational motions of 4CzIPN molecules were confirmed. Interestingly, the florescence lifetime of 4CzIPN was considerably elongated from 2.37 ns to 14.8 ns, while the phosphorescence lifetime became a little bit short from 2.15 μs to 1.65 μs. The lifetime differences was thought to be due to the suppression of the 4CzIPN molecules' motion by the close ZIF-11 frameworks that affected the reverse intersystem crossing.. |
| 27. | Junfeng Zhu, Keisuke Nakakubo, Yuya Mikami, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki, Investigation and modeling of UV band-passfiltering white compound materials for potting or embedding in micro-optical applications, Optical Materials Express, 10.1364/OME.9.001002, 9, 3, 1002-1014, 2019.03, [URL], A novel white compound material with spectral band pass filtering was proposed and demonstrated in the UV region for wavelengths smaller than 310 nm. This compound material can be obtained by dispersing CaF 2 in polydimethylsiloxane (PDMS). Refractive index matching (RIM) of the compound material resulted in transmittance of up to 80% at RIM wavelength. In no-RIM wavelength region, refractive index difference about 0.005 could result in transmittance of down to 30% due to intense Rayleigh isotropic scattering. A good reproducibility of the transparent wavelength can be obtained with the specific CaF 2 particle and PDMS matrix in this study. Meanwhile, simple calculation based on Rayleigh- Gans-Debye approximation [J. Am. Ceram. Soc. 86(3), 480-486 (2003)] in the soft diffusion model can explain the CaF 2 : PDMS compound film transmittance spectrum in the UV region, and the bandwidth narrowing condition.. |
| 28. | Cong Chen, Jin Yuan, Lei Wan, Hengky Chandrahalim, Zhenshi Chen, Naoya Nishimura, Harunobu Takeda, Hiroaki Yoshioka, Weiping Liu, Yuji Oki, Xudong Fan, Zhaohui Li, Demonstration of on-chip quantum dot microcavity lasers in a molecularly engineered annular groove, Optics Letters, 10.1364/OL.44.000495, 44, 3, 495-498, 2019.02, [URL], The on-chip quantum dot (QD) microcavity laser engineered on an annular groove made of fused silica was demonstrated based on the external quasi-cavity configuration. By incorporating an appropriate dose of polymer into QD film, the spectral purity of the lasing spectrum was significantly enhanced. In contrast to the dye microcavity laser embedded on the same trench profile, a QD laser possesses a lifetime that is over 10 times longer. We have introduced a unique two-step quantum gain deposition process that has remarkably reduced the wavelength drifts of laser emissions in an aqueous environment by approximately 400%. The reconfigurable cavity platform in combination with an appropriately engineered quantum gain medium embedded onto it promises to enable photostable chip-scale coherent light sources for various photonic, chemical, and biochemical sensing applications.. |
| 29. | Chacriya Malasuk, Keisuke Nakakubo, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki, 3D printing optical devices based on silicone optical technology (SOT) and its application on analytical chemistry, Proc. SPIE, 10.1117/12.2508677, 10914, 109141S, 2019.02. |
| 30. | Lei Wan, Cong Chen, Junfeng Zhu, K. T.Abdul Nasir, Qingyu Cui, Zhenshi Chen, Hiroaki Yoshioka, Weiping Liu, Yuji Oki, Zhaohui Li, Changes in optical characteristics induced by polymer blending in printed colloidal quantum dots microlasers, Optics Letters, 10.1364/OE.27.019615, 27, 14, 19615-19623, 2019.01, [URL], On-chip microlasers are desirable to meet the different control requirements and unique demands in different application scenarios. In this work, we obtained the on-chip microlaser by printing pixelated CdSe/ZnS colloidal quantum dots (CQDs), incorporating the quantum dot self-assembly mechanism and the external cavity-free configuration. The spectral purity of the microlaser can be significantly improved by slightly blending polymer into the CQD matrix. The quasitoroid profile was gradually changed to microdisks as the polystyrene (PS) concentration increased from 0 wt.% to 10 wt.%. Specially, when the PS solution varied from 0 wt.% to 1 wt.%, the lasing threshold of 1.4 μJ/mm2 was increased up to 14 μJ/mm2, meanwhile the emission wavelength range showed a 25 nm blue-shift approximately. The easy printing technologies and the low-cost polymer blending method employed in the obtained microlasers will further facilitate the development of printing photonics and electronics, especially in the high-performance microlaser displays and high-precision sensors.. |
| 31. | K. T.Abdul Nasir, Cong Chen, Yuya Mikami, Taku Takagishi, Hiroaki Yoshioka, Motonobu Matsuyama, Naoya Nishimura, Nilesh J. Vasa, Yuji Oki, Lasing characteristics of a pyrromethene597-doped microdisk laser fabricated by the ink-jet printing method, Japanese Journal of Applied Physics, 10.7567/1347-4065/ab1e3c, 58, SJ, 2019.01, [URL], A microdisk laser based on the fluorinated hyper branched polymer FC-V-50 was fabricated on an FEP (fluorinated ethylene propylene) substrate with the use of the ink-jet printing method. Pyrromethene597 doped 10 wt.% FC-V-50 solution in ethanol was used for the fabrication of a microdisk laser. The FC-V-50 polymer is characterized by a carboxyl functional group, which can be activated and attached to an amine group found in biomolecules. Based on the lasing characteristics, it is found that the microdisk laser has a relatively low lasing threshold of 34.51 μJ mm-2 and a reasonable Q factor of 7.52 × 103 at 586.59 nm. Therefore, the microdisk can be used for biosensing. The root mean square (RMS) of the surface roughness of the microdisk was estimated to be 6.2 nm. The surface roughness results scattering losses and limits the Q factor. This work reports the first demonstration of a microdisk laser based on FC-V-50 for biosensing applications.. |
| 32. | Hiroaki Yoshioka, Shintaro Mitsui, Yuji Oki, Lasing from Printable Organic-Inorganic Microdisk Cavity with Mixed Doping of Laser Dye and ZnO, 2018 European Conference on Optical Communication, ECOC 2018 2018 European Conference on Optical Communication, ECOC 2018, 10.1109/ECOC.2018.8535487, 2018.11, [URL], We have experimentally demonstrated a fabrication and WGM lasing of organic-inorganic microdisk mixed with laser dye and ZnO by the ink-jet printing without co-doping binding polymer for cavity host. This is the first demonstration of binder-free organic-inorganic hybrid microdisk lasers.. |
| 33. | Abdul Nasir, Cong Chen, Yuya Mikami, Hiroaki Yoshioka, Naoya Nishimura, Nilesh Vasa, and Yuji Oki, Lasing characteristics of pyrromethene597 doped fluorinated hyper branched polymer based microdisk laser fabricated by ink-jet printing method, 23rd Microoptics Conference, MOC2018, 2018.10. |
| 34. | Taku Takagishi, Hiroaki Yoshioka, Shintaro Mitsui, Yuya Mikami, Naoya Nishimura, Yuji Oki, Highly Transparent Organic Microdisk Cavity in Visible Range by the Ink-jet Printing Method, 2018 Conference on Lasers and Electro-Optics, CLEO 2018 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings, 2018.08, We experimentally demonstrated the fabrication and the fundamental lasing evaluation of a printed microdisk cavity by focusing on a fluorinated spherical polymer FZ-001 to achieve a microdisk with small absorption loss in the visible range.. |
| 35. | Keisuke Nakakubo, Junfeng Zhu, Yuya Mikami, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki, Novel spectroscopic transparent/scattering material for 260/280nm ultraviolet optical detection, 2018 Conference on Lasers and Electro-Optics, CLEO 2018 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings, 2018.08, Novel type of wavelength filter was proposed and demonstrated. Polydimethylsiloxane was mixed with CaF2 particles. This scattering material of 30wt% provided transparency at specified wavelength of 259 nm and 278nm.. |
| 36. | Keisuke Nakakubo, Hiroaki Nomada, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki, On-demand lens fabrication by liquid phase molding with gallium and Polydimethylsiloxane, 2018 Conference on Lasers and Electro-Optics, CLEO 2018 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings, 2018.08, A new on-demand lens fabrication with gallium molding was proposed and demonstrated. A convex and concave surface of liquid gallium is transferred to Polydimethylsiloxane. The curvature can be controlled between ±0.37 mm-1.. |
| 37. | Yuya Mikami, Hiroaki Yoshioka, Soichiro Ryu, Naoya Nishimura, Yuji Oki, Organic-inorganic hybrid microdisk laser with dye and silica mixed doping prepared by ink-jet printing method, Optics Express, 10.1364/OE.26.007140, 26, 6, 7140-7147, 2018.03, [URL], We developed an ink-jet printing method for fabricating inorganic microdisks at room temperature, which is much lower than the melting point of solid-state inorganic oxide, and have fabricated an organic-inorganic hybrid microdisk laser. Silica was used as the inorganic disk material, and microdisk-shaped aggregates were formed by the ink-jet printing method using a solution in which nanosilica particles were dispersed in propylene glycol monomethylether (PGME) solvent. Then, a microdisk capable of laser oscillation was also prepared by preliminarily adding the laser dye rhodamine 6G to the ink to form a mixed organic material. The structural evaluation of the printed microdisk was first conducted using an optical microscope, a scanning electron microscope (SEM), and an atomic force microscope (AFM). The results of laser oscillation evaluation by optical excitation showed that the printed microdisk sufficiently functions as an optical resonator with a low optical loss. In these evaluations, excellent values such as a surface roughness of 5.83 nm from root mean square (R. M. S.) which is one forth smaller than the particle diameter, and a laser oscillation threshold of 4.76 μJ/mm2 at a wavelength of 601.4 nm were obtained. To the best of our knowledge, this is the first time that an inorganic microdisk has been fabricated at room temperature to realize an organic-inorganic hybrid microdisk laser.. |
| 38. | Cong Chen, Lei Wan, Hengky Chandrahalim, Jian Zhou, Hui Zhang, Sangha Cho, Ting Mei, Hiroaki Yoshioka, Huiping Tian, Naoya Nishimura, Xudong Fan, L. Jay Guo, Yuji Oki, Effects of edge inclination angles on whispering-gallery modes in printable wedge microdisk lasers, Optics Express, 10.1364/OE.26.000233, 26, 1, 233-241, 2018.01, [URL], The ink-jet technique was developed to print the wedge polymer microdisk lasers. The characterization of these lasers was implemented using a free-space optics measurement setup. It was found that disks of larger edge inclination angles have a larger free spectral range (FSR) and a lower resonance wavelength difference between the fundamental transverse electric (TE) and transverse magnetic (TM) whispering-gallery modes (WGMs). This behavior was also confirmed with simulations based on the modified Oxborrow’s model with perfectly matched layers (PMLs), which was adopted to accurately calculate the eigenfrequencies, electric field distributions, and quality parameters of modes in the axisymmetric microdisk resonators. Combined with the nearly equivalent quality factor (Q-factor) and finesse factor (F-factor) variations, the correlations between the TE and left adjacent TM modes were theoretically demonstrated. When the edge inclination angle is varied, the distinguishable mode distribution facilitates the precise estimation of a resonance wavelength shift. Therefore, the flexible and efficient nature of wedge polymer microdisk lasers extends their potential applications in precision sensing technology.. |
| 39. | 吉岡 宏晃, 髙岸 拓, 三井 晨太郎, 三上 裕也, 陳 聰, 西村 直也, 興 雄司, インクジェット印刷法によるフッ素系球状ポリマーのマイクロディスク共振器の作製とレーザー発振評価, レーザー研究, 46, 1, 41-44, 2018.01. |
| 40. | Keisuke Nakakubo, Hiroaki Nomada, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki, Gallium and polydimethylsiloxane molding for self-organized spherical lens surface fabrication, Applied Optics, 10.1364/AO.56.009900, 56, 36, 9900-9906, 2017.12, [URL], We present a new fabrication method for optical surfaces using liquid metal molding. Common optical surfaces are fabricated by the polishing of glasses or plastics. By contrast, the fabrication method we propose involves the transfer of a spherical surface of liquid molded metal with silicone rubber. The concept presented in this paper is of a new molding method in which a mold is placed inside. The curvature can be controlled from ∼0.37 mm−1 to −0.37 mm−1 by wetting the liquid metal. An application of this method is to produce on-demand optical elements (e.g., lenses and mirrors).. |
| 41. | Hiroaki Nomada, Kinichi Morita, Hirokazu Higuchi, Hiroaki Yoshioka, Yuji Oki, Carbon–polydimethylsiloxane-based integratable optical technology for spectroscopic analysis, Talanta, 116, 428-432, 2017.05. |
| 42. | Hiroaki Yoshioka, Yuya Mikami, Soichiro Ryu, Shintaro Mitsui, Cong Chen, Naoya Nishimura, Yuji Oki, Silica-based Inorganic Microdisk Cavity by the Ink-jet Printing Method, CLEO: 2017, 2017.05. |
| 43. | Hiroaki Yoshioka, Controlling mobility speed of dye molecules in polydimethylsiloxane through molecular weight and solubility, OPTICAL MATERIALS EXPRESS, 10.1364/OME.6.003417, 6, 11, 3417-3426, 2016.11. |
| 44. | Harunobu Takeda, Cong Chen, Takeshi Komino, Hiroaki Yoshioka, Yuji Oki, Chihaya Adachi, 0.6-1.6 THz band spectroscopy of organic thermally activated delayed fluorescence materials, OPTICAL MATERIALS EXPRESS, 10.1364/OME.6.003045, 6, 10, 3045-3052, 2016.10. |
| 45. | Hiroaki Yoshioka, Cong Chen, Soichiro Ryu, Jifeng Li, Masaaki Ozawa, Yuji Oki, Ultra-low Threshold Lasing at 0.8 μm from Organic Microdisk Cavity by the Ink-jet Printing Method, CLEO: 2016, 2016.06. |
| 46. | Cong Chen, Jifeng Li, Soichiro Ryu, Hiroaki Yoshioka, Masaaki Ozawa, Yuji Oki, Spectroscopic behavior in whispering-gallery modes by edge formation of printed microdisk lasers, Proc. SPIE, 10.1117/12.2202423, 9668, 96685J, 2015.12. |
| 47. | Soichiro Ryu, Hiroaki Yoshioka, Cong Chen, Kei Yasui, Yuji Oki, High-Q Printable Polymer Microdisk without Etching, 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, 2015.06. |
| 48. | Mitsuhiro Nakano, Noboru Hirakawa, Hiroaki Yoshioka, Yuji Oki, On-site three-dimensional fabrication of organic optical system with micro-dispensing method, 3nd EOS Conference on Optofluidics (EOSOF 2015), 2015.06. |
| 49. | Hiroaki Yoshioka, Noboru Hirakawa, Mitsuhiro Nakano, Yuji Oki, On-Demand Fabrication of Micro-Wired Rods and Nano-Coupling Control for 3D Polymeric Optical System, CLEO: 2015, 2015.05. |
| 50. | Hiroaki Yoshioka, Tomoya Ota, Cong Chen, Soichiro Ryu, Kei Yasui, Yuji Oki, Extreme ultra-low lasing threshold of full-polymeric fundamental microdisk printed with room-temperature atmospheric ink-jet technique, SCIENTIFIC REPORTS, 10.1038/srep10623, 5, 2015.05, 円盤型レーザー素子は、髪の毛の太さ程度の円盤形状をした光を閉じ込め共振させる微小共振器（マイクロディスクキャビティー）から構成され、情報処理分野における集積光回路に実装可能な周波数コム発生素子、医療バイオ分野におけるウイルス１個程度を検出できる超高感度バイオセンサーなど多岐にわたる分野で応用が可能なことから近年大きな注目を集めている。しかしこの円盤型レーザー素子の作製には、従来、フォトリソグラフィー法といった半導体プロセスの高度な技術が用いられてきたため、工場・実験室レベルで扱うものという考えが当該研究分野では常識であった。そこで本研究ではインクジェット技術を利用した室温・大気圧下で作製できる全く新しい分散型産業を指向した「インクジェットレーザー印刷法」を確立した。これは、超省エネルギーの円盤型レーザー素子を必要な場所に必要な数だけ市販のインクジェットプリンターのように簡単に卓上印刷できるという極めて独創的な技術である。当該学術分野のデバイス作製難易度を大きく低下させる「作製プロセスの簡素化」に大きく貢献したことは言うまでもなく、特に簡素な手法でありながら作製されたレーザー素子は駆動に必要なエネルギー（レーザー発振しきい値）において世界記録（従来より22%低いエネルギー）の「超省エネルギー化」を達成したことは学術的貢献が極めて高い。. |
| 51. | Cong Chen, Soichiro Ryu, Hiroaki Yoshioka, Kei Yasui, Yuji Oki, Low-threshold lasing from organic and polymeric microdisk printed by room temperature atmosphere ink-jet technique, Proc. SPIE, 10.1117/12.2078965, 9360, 936007, 2015.03. |
| 52. | Tokuma Nakamichi, Yu Yang, Tomoya Ohta, Hiroaki Yoshioka, Masayuki Yahiro, Masanao Era, Hirofumi Watanabe, Yuanjing Cui, Yuji Oki, Guodong Qian, Stackable spectral-sensitive conductive films based on cyanine aggregates via an inkjet method, DYES AND PIGMENTS, 10.1016/j.dyepig.2013.03.013, 98, 3, 333-338, 2013.09. |
| 53. | Noboru Hirakawa, Hiroyuki Kubota, Hiroaki Yoshioka, Noriyasu Tarumi, Yoshio Kagebayashi, Yuji Oki, Micro-dispensing for three-dimensional direct fabrication of laser waveguides, 2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013.07. |
| 54. | Hiroaki Yoshioka, Yusuke Itoh, Ayumu Kiyomori, Yuji Oki, Degradation self-recovery and durability extension on solid-state dye laser in blue region, CLEO: 2013, OSA Technical Diges, 10.1364/CLEO_SI.2013.CF1I.5, 2013.05. |
| 55. | Tomoya Ota, Hiroaki Yoshioka, Kei Yasui, Daisuke Maeda, Yuji Oki, Printed Fabrication of Microdisk at Room Temperature, Proc. of 2nd EOS Conference on Optofluidics 2013, 2, 1569714735_1-1569714735_2, 2013.05. |
| 56. | Kota Kuwamitsu, Hiroaki Yoshioka, Nahoko Naruishi, Yoshihide Tanaka, Yuji Oki, Print-like Fabrication of Laser Systems in PDMS Flowchip, Proc. of 2nd EOS Conference on Optofluidics 2013, 2, 1569714773_004_1-1569714773_004_2, 2013.05. |
| 57. | Hiroaki Yoshioka, Yuji Oki, Nd:YAG/Cr:GSGG passively Q-switched compact DPSS laser with flexure-frame structure, The 1st. Laser Ignition Conference '13, LIC4-3-1-LIC4-3-2, 2013.04. |
| 58. | Hiroaki Yoshioka, Yusuke Itoh, Ayumu Kiyomori, Masanao Era, Yuji Oki, Fluorene-based chromophore for degradation-recoverable solid-state dye laser, OPTICAL MATERIALS EXPRESS, 3, 2, 176-183, 2013.01. |
| 59. | Yu Yang, Tokuma Nakamichi, Hiroaki Yoshioka, Masayuki Yahiro, Masanao Era, Hirofumi Watanabe, Yuanjing Cui, Yuji Oki, Guodong Qian, Spectral-resolving capable and integratable multilayered conductive films via an inkjet method, JOURNAL OF MATERIALS CHEMISTRY C, 10.1039/c2tc00743f, 1, 9, 1739-1744, 2013.01. |
| 60. | 鍬光 浩太, 吉岡 宏晃, 片岡 周作, 鳴石 奈穂子, 田中 喜秀, 興 雄司, 微小流体光学に向けたチップ内組み込みレーザーの研究, レーザー研究, 40, 951-955, 2012.12. |
| 61. | Hiroyuki Kubota, Soichiro Oomi, Hiroaki Yoshioka, Hirofumi Watanabe, Yuji Oki, Optical bending sensor using distributed feedback solid state dye lasers on optical fiber, OPTICS EXPRESS, 20, 14, 14938-14944, 2012.07. |
| 62. | Hiroaki Yoshioka, Wataru Iwasaki, Yukihiro Yamashita, Nobuo Miyadera, Kei Yasui, Daisuke Maeda, Yuji Oki, Nd3+-TFA:HPDA Polymeric Microchip Laser, 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2012.05. |
| 63. | Hiroaki Yoshioka, Yu Yang, Hirofumi Watanabe, Yuji Oki, Fundamental characteristics of degradation-recoverable solid-state DFB polymer laser, OPTICS EXPRESS, 20, 4, 4690-4696, 2012.02. |
| 64. | Kota Kuwamitsu, Hiroaki Yoshioka, Ryo Goto, Hirofumi Watanabe, Nahoko Naruishi, Yoshihide Tanaka, Yuji Oki, Integration of Distributed-feedback (DFB) Solid-state Dye Lasers with Optical Pumping Systems for PDMS Micro Biochemistry Chips, IQEC/CLEO Pacific Rim 2011, 378-380, 2011.08. |
| 65. | Hiroaki Yoshioka, Wang Weibo, Kota Kuwamitsu, Wataru Iwasaki, Yukihiko Yamashita, Noboru Miyadera, Yuji Oki, Laser Action of Nd-Complex-Doped Polymer Laser Based on Liquid, MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 10.1080/15421406.2011.566444, 539, 225-230, 2011.05. |
| 66. | Yu Yang, Tokuma Nakamichi, Hiroaki Yoshioka, Soichiro Omi, Ryo Goto, Hirofumi Watanabe, Yuji Oki, Intensity Sensitive Organic Photodiodes Patterned by Inkjet Method, MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 10.1080/15421406.2011.563689, 538, 136-142, 2011.05. |
| 67. | Hiroaki Yoshioka, Ryo Goto, Soichiro Omi, Yu Yang, Yuji Oki, Degradation Recoverable DFB Lasers Based on P597:PDMS/PTFEMA, The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2011 paper:, 2011.05. |
| 68. | Tokuma Nakamichi, Yu Yang, Soichiro Omi, Hiroaki Yoshioka, Hirofumi Watanabe, Masayuki Yahiro, Masanao Era, Yuji Oki, Monochromatic Organic Photodiodes Made by Stackable Ink-jet Fabrication for Integrated Laser Chips, 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2011.05. |
| 69. | Hiroaki Yoshioka, Ryo Goto, Soichiro Omi, Yu Yang, Yuji Oki, Solid-State Polymer Waveguide DFB Laser with Self Dye-Circulatory Function, 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2011.05. |
| 70. | Soichiro Omi, Hiroyuki Kubota, Hiroaki Yoshioka, Hirofumi Watanabe, Yuji Oki, Direct Laser fabrication on Polymeric Optical Fiber and Its Sensor Application, CLEO: Science and Innovations (CLEO: S and I) 2011 paper:, 2011.05. |
| 71. | Tokuma Nakamichi, Yu Yang, Hiroaki Yoshioka, Soichiro Omi, Hirofumi Watanabe, Yuji Oki, Printable DFB Laser and Wavelength Monitor Systems by On Demand Fabrication on Flexible Films, 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2011.05. |
| 72. | Hiroaki Yoshioka, Wang Weibo, Kota Kuwamitsu, Wataru Iwasaki, Yukihiko Yamashita, Nobuo Miyadera, Yuji Oki, High Efficient Laser Action by Nd3+ Complex, 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2011.05. |
| 73. | Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Dual-wavelength mode-locked Yb:YAG ceramic laser in single cavity, 2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS), 2010.05. |
| 74. | Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Dual-wavelength mode-locked Yb:YAG ceramic laser in single cavity, OPTICS EXPRESS, 18, 2, 1479-1486, 2010.01. |
| 75. | Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, 233-fs mode-locked Yb:YAG ceramic laser, 2009 LASERS & ELECTRO-OPTICS & THE PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1 AND 2, 1248-1249, 2009.09. |
| 76. | Shinki Nakamura, Hiroaki Yoshioka, Takayo Ogawa, Satoshi Wada, Broadly Tunable Yb3+-Doped Y3Al5O12 Ceramic Laser at Room Temperature, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.1143/JJAP.48.060205, 48, 6, 2009.06. |
| 77. | Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Diode-Pumped Mode-Locked Yb:YAG Ceramic Laser, 2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE (IQEC), 2009.06. |
| 78. | Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Diode-pumped mode-locked Yb:YAG ceramic laser, OPTICS EXPRESS, 17, 11, 8919-8925, 2009.05. |
| 79. | 吉岡 宏晃, 中村 真毅, 小川 貴代, 和田 智之, 高効率・広帯域波長可変Yb:YAGセラミックレーザー, レーザー研究, 36, 648-652, 2008.10. |
| 80. | Shinki Nakamura, Hiroaki Yoshioka, Yu Matsubara, Takayo Ogawa, Satoshi Wada, Efficient tunable Yb : YAG ceramic laser, OPTICS COMMUNICATIONS, 10.1016/j.optcom.2008.05.009, 281, 17, 4411-4414, 2008.09. |
| 81. | Hiroaki Yoshioka, Shinki Nakamura, Yu Matsubara, Takayo Ogawa, Satoshi Wada, Efficient tunable diode-pumped Yb:YAG ceramic laser, 2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9, 2601-2602, 2008.05. |
| 82. | Shinki Nakamura, Hiroaki Yoshioka, Yu Matsubara, Takayo Ogawa, Satoshi Wada, 6.8-W High Efficiency Yb:YAG Ceramic Laser at Room Temperature, The Review of Laser Engineering, 36, 1073-1076, 2008.01. |
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