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Yuji Oki Last modified date：2024.04.25

Professor / Integrated Electronics
Department of Electronics
Faculty of Information Science and Electrical Engineering


Graduate School
Department of Systems Life Sciences
Graduate School of Systems Life Sciences
「デジタルファブリケーションを活用した教育」外部連携教員
Department of Electrical and Electronic Engineering
Graduate School of Information Science and Electrical Engineering
工学府 分子システムデバイス博士課程リーディングコース
システム情報科学府 分子システムデバイス博士課程リーディングコース
Undergraduate School
Department of Electrical Engineering and Computer Science
School of Engineering
Other Organization
Other
Center of Plasma Nano-interface Engineering
Academia-Industry molecular systems for Devices Research and Education Center
Center for Organic Photonics and Electronics Research(OPERA)


Homepage
https://kyushu-u.elsevierpure.com/en/persons/yuji-oki
　Reseacher Profiling Tool　Kyushu University Pure
https://www.laserlab.ed.kyushu-u.ac.jp/
Laser Laboratory .
Academic Degree
Ph.D
Country of degree conferring institution (Overseas)
No
Field of Specialization
Laser Engineering
Total Priod of education and research career in the foreign country
01years01months
Outline Activities
Research Activities are as follows:

-Laser spectroscopy
LIF, Absorption Spectroscopy, Raman spectroscopy, Laser Radar, Nonlinear Raman Spectroscopy
-Applications due to laser spectroscopy
Trace element/gas detection, Nanometer scaled solid state diagnostic,
Atomospheric diagnostics
-Laser developement for spectroscopic applications
Tunable lasers (Ti:sapphire, dyes, solid state-dyes)
Solid state lasers (Nd:YAG, Ti:sapphire)
Disporsable Film Lasers (proposal)

Computer systems for researching:
-Developement of `Integrated managements system' for depertment of I.S.E.E., Kyushu univ.
based on the Web system.(http://www.isee.kyushu-u.ac.jp)
-Developement of Web system of `Research report on ISEE of kyushu university'
(http://kiyou.isee.kyushu-u.ac.jp)
-On line syllabus / Staff data base / Students data base / Researching data base
Research
Research Interests
  • On-deman fabrication of polymeric micro disk by ink-jet technology
    keyword : Microdisk, Organic material, Ink-jet, Whisper Gallery Mode , Laser
    2012.04～2014.10.
  • 3D fabrication protocols for optical system development
    keyword : PDMS OpticalSystem 3D-printer 3DCAD
    2013.04～2015.03.
  • microrod 3D wiring techniques with microdispenser and WGM lasing sensor
    keyword : Whisper Gallery Mode, micro rod, micro dispenser
    2013.10～2015.05.
  • Terahertz spectroscopy of organic photonic materials
    keyword : Organic photonic material, Terahertz
    2014.05～2015.05.
  • Nano scale tome for SEM by deep-UV laser ablation on organs
    keyword : Laser Ablation, ArF Excimer Laser, Sanning Electron Microscope, Ultra Micro Tome
    2013.04～2015.03.
  • Micro Dispense Method for Laser Waveguide Print-like-fabrication
    keyword : Waveguide Organic Dye laser
    2011.04～2015.03.
  • Developement of organic photodiodes with wavelength resolution with ink-jet technique
    keyword : Photodiode, Organic material, Ink-jet, J-aggregation, cyanine dyes
    2007.09～2012.03.
  • DPSS microchip laser for integrated tunable lasers
    keyword : Microchip lasers, Nd:YAG, Passively Q-switch, Diode pumped solid state lasers,
    2005.04.
  • Laser induced breakdown spectroscopy ofr direct measurement of China Dust in the atmosphere.
    keyword : LIBS, Impurity analysis, trace element analysis, China dust, Yellow sand
    2004.04～2008.04.
  • Developement of printable integrated tunable lasers
    keyword : Tunable lasers, Oprganic polmer, Laser dye, Optical Waveguide
    2005.04.
  • Trace element detection with extremely high spatial resolution based on laser ablation technique.
    keyword : Laser ablations, Nano meter resolution, Trace element analysis
    1998.04～2006.03.
  • Remote detection of inflamable gases with laser rader technique
    keyword : Lidar, Radar, CH4, Atmosphereic monitering, Gas analysis
    1998.03～2000.03.
  • Gas detection with nonlinear Raman spectroscopy
    keyword : Gas detection, Nonlinear Ram spectroscopy, CArS, PAS, Ch4
    1996.01～2003.03.
Current and Past Project
  • The novel type solid-state dye laser was fabricated on the optical-fiber core. Two color laser radiation waas demonstrated from plastic optical fiber coupled with 532nm micro-chip Nd:YAG laser.
  • Developement of "Universal Laser Array" Chip
Academic Activities
Books
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Reports
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Papers
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1. Hiroaki Nomada, Kin'ichi Morita, Hirokazu Higuchi, Hiroaki Yoshioka, Yuji Oki, Carbon–polydimethylsiloxane-based integratable optical technology for spectroscopic analysis, Talanta, 2015.12, A polydimethylsiloxane (PDMS)-based optical system has been demonstrated. To suppress intense background radiation due to multiple internal scatting in a transparent material, a composite structure of a carbon–PDMS compound and PDMS was proposed. The index matching of the real part of the refractive index can suppress internal scattering, and an absorption of 99%–99.7% was attained by using carbon micro particles and carbon nano tubes. The black-PDMS light channel functions as a light filter for straight pass, and an optical density of 5 was obtained by bending the filter..
2. Hiroaki Yoshioka, Tomoya Ota, Cong Chen, Soichiro Ryu, Kei Yaui, 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, [URL], We experimentally demonstrated an extreme ultra-low lasing threshold from full-polymeric fundamental microdisk cavities fabricated by a novel fabrication method, the ink-jet printing method, which is much simpler and easier than previous methods such as lithography. The ink-jet printing method provides additive, room-temperature atmospheric, rapid fabrication with only two steps: (i) stacking cladding pedestal and waveguiding disk spots using the ink-jet technique, and (ii) partial etching of the cladding pedestal envelope. Two kinds of low-viscosity polymers successfully formed microdisks with high surface homogeneity, and one of the polymers doped with LDS798 dye yielded whispering-gallery-mode lasing. The fundamental disks exhibited an extremely ultra-low lasing threshold of 0.33 μJ/mm2 at a wavelength of 817.3 nm. To the best of our knowledge, this lasing threshold is the lowest threshold obtained among both organic and inorganic fundamental microdisk cavity lasers with a highly confined structure..
3. Takaoaki Kanemaru, Yuji Oki, Ultrathin sectioning with DUV-pulsed laser ablation:
development of a laser ablation nano tome, Microscopy, 10.1093/jmicro/dfv015, 1-4, 2015.04, The electrically automated ultrathin sectioning apparatus, which has been developed in
recent years, can produce consecutive ultrathin sections with a diamond knife and a
gallium ion beam. These newly developed apparatuses, however, have several shortcomings,
such as the limited block cutting area, thermal damage to the sample by the focused
ion beam and a sample electronic charge. To overcome these faults and for easier scanning
electron microscopy three-dimensional fine structural reconstruction, we have developed
a new cutting method using a deep ultraviolet laser, which we have named the
‘LANTome (Light Ablation Nanotome)’. Using this method, we confirmed the widening of
sectioning areas, shortening of the sectioning time, automatic smoothing of rough surfaces,
no sample electronic charge and minimal heat effects on the sample tissue, such as
thermal denaturation..
4. Yuji Oki, Hiroaki Yoshioka, Tokuma Nakamichi, Masayuki Yahiro, Masaya Miyazaki, Masanao Era, Hirofumi Watanabe, 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.
5. Hiroyuki Kubota, Soichiro Oomi, Hiroaki Yoshioka, Hirofumi Watanabe, and Yuji Oki, Optical bending sensor using distributed feedback solid state dye lasers on optical fiber, Optics Express, 20, 4, 20(2011), p.4690-4696, 2011.01.
6. Yuji OKI, Shusaku KATAOKA, Noriyuki KAMOGAWA, Hirofumi WATANABE, Kenichi Yamashita, Masaya Miyazaki, Integration of Multiple-DFB Dye Lasers and Microflow-Channel on a Polymeric Chip, Proceedings Advanced Solid State Photonics 2008, 2008.01.
7. Shusaku KATAOKA, Noriyuki KAMOGAWA, Masamitsu TANAKA, Hirofumi WATANABE, Kenichi YAMASHITA, Masaya MIYAZAKI, Satoru KUHARA, Yuji OKI, Polymeric microflowcytometry chip integrated with Mulitple-colored filme DFB Lasers, Technical Digest of The 6th Asia Pacific Laser Symposium, pp.53, 2008.01.
8. Y. Oki, T. Okaguchi, H. Watanabe, T. Okada, Modulatable and monolithic SHG waveguide based on PPLN and EO-phase-modulator, CLEO/Europe 2007, pp.CD8-6-THU, 2007.06.
9. Yuji Oki, Yukinori Ogawa, Hirofumi Watanabe, Mitsuo Maeda, Coupling Control on Quasi-End-Fired DFB Film Dye Laser on a Plastic Chip, Technical digest of CLEO/QELS 2006, pages CFJ2, 2006.05.
10. Yuji Oki, Masamitsu Tanaka, Yukinori Ogawa, Hirofumi Watanabe, Mitsuo Maeda, Development of Quasi-End-Fired Waveguide Plastic Dye Laser, J. of IEEE, Volume QE-42, Number 4, pages 389-396, 2006.04.
11. Y. Oki, S. Miyamoto, M. Tanaka, D. Zuo, M. Maeda, Long Lifetime and High Repetition Rate Operation form Distributed Feedback Plastic Waveguided Dye Lasers, Optics Communications, 10.1016/S0030-4018(02)02125-9, 214, 1-6, 277-283, Vol.214, pp.227-283, 2002.12.
12. Y. Oki, T. Yoshiura, Y. Chisaki, M. Maeda, Fabrication of a Distributed-Feedback Dye Laser with a Grating Structure in its Plastic Waveguide, Appl. Optics, 10.1364/AO.41.005030, 41, 24, 5030-5035, Vol.41, No.24, pp.5030-5035, 2002.08.
13. G. Ramos-Ortiz, Y. Oki, B. Domercq, B. Kippelen, F{o}rster energy transfer from a fluorescent dye to a phosphorescent dopant: a concentration and intensity study, Phys. Chem. Chem. Phys, Vol.4, pp.4109-4114, 2002.08.
14. Y. Oki, S. Miyamoto, M. Maeda, N. J. Vasa, Multiwavelength Distributed-Feedback Dye Laser Array and its Application to Spectroscopy, Optics Letters, 10.1364/OL.27.001220, 27, 14, 1220-1222, Vol.27, No.14, pp.1220-1222, 2002.07.
15. Y. Oki, S. Miyamoto, N. J. Vasa, M. Maeda, Novel Laser Spectroscopy Based on Multi-Wavelength and Multi-Striped Waveguided Solidstate Dye Laser, Technical Digest of CLEO/QELS, pp.213-214, 2002.06.
16. D. Zuo, D. Furukawa, Y. Oki, M. Maeda, Waveguided Dye Laser with Distributed Feedback, Proc. Int. Workshop on Informations and Electrical Engineering(IWIE), pp.199-204, 2002.05.
17. N. J. Vasa, A. Hatada, S. Nakazono, Y. Oki, M. Maeda, Feasibility of Nonlinear Raman Lidar Based on Stimulated Raman Gain Spectroscopy without a Tunable Laser, Appl. Optics, 10.1364/AO.41.002328, 41, 12, 2328-2332, Vol.41, No.12, pp.2328-1332, 2002.04.
18. Development of an Alternating Wavelength Controller for a Laser Rader for the Measurement of CO2 in the Atmosphere.
19. G. Ramos-Ortiz, Y. Oki, B. Domercq, B. Kippelen, F{o}rster Energy Transfer from a Fluorescent Dye to a Phosphorescent Dopant : a Concentration and Intensity Study, Technical Digest of 6th International Conference On Organics Nonlinear Optics (ICONO'6), pp.PS35, 2001.12.
20. N. J. Vasa, Y. Oki, T. Okada, M. Maeda, Development of All-Solid State Tunable Laser Sources for Spectroscopic Applications, Recent Res. Devel. Applied Phys., Vol.4, pp.77-85, 2001.10.
21. D. Zuo, N. J. Vasa, Y. Oki, M. Maeda, Numerical Simulation of Waveguided Distributed Feedback Dye Lasers by Coupled Mode Theory, Proc. Int. Symp. Laser - Aided Plasma Diagnostics, pp.265--270, 2001.09.
22. Y. Oki, T. Higotani, T. Takao, M. Maeda, Nano-Scale Solid Surface Analysis Using Laser Ablation Atomic Fluorescence Spectroscopy, Proc. Int. Symp. Laser - Aided Plasma Diagnostics, pp.328--333, 2001.09.
23. A. Hatada, S. Nakazono, N. J. Vasa, Y. Oki, M. Maeda, Proposal of Nonlinear Raman Lidar Based on Stimulated Raman Gain Spectroscopy without Tunable Laser, Technical Digest of CLEO Pacific-Rim2001, 170-171, pp.170--171, 2001.07.
24. S. Miyamoto, Y. Oki, S. Tokuyama, M. Maeda, Polymer-Based Solid-State Multi-Strip Dye Lasers for Laser Spectroscopy without Frequency Scanning, Technical Digest of CLEO Pacific-Rim2001, 214-215, pp.214--219, 2001.07.
25. T. Higotani, M. K. Kim, T. Takao, Y. Oki, M. Maeda, Nanometer-Scale Surface Element Analysis Using Laser Ablation Atomic Fluorescence Spectroscopy, Technical Digest of CLEO Pacific-Rim2001, 34-35, pp.34--35, 2001.07.
26. M. K. Kim, T. Higotani, T. Takao, Y. Oki, M. Maeda, Influence of Irradiation Wavelength on Atomic Emission Spectroscopy Using Laser Ablation, Jpn. J. Appl. Phys., 10.1143/JJAP.40.2556, 40, 4A, 2556-2557, Vol.40, No.4A, pp.2556--2557, 2001.04.
27. M. K. Kim, T. Takao, Y. Oki, M. Maeda, Thin-Layer Ablation of Metals and Silicon by Femtosecond Laser Pulses for Application to Surface Analysis, Jpn.J.Appl.Phys., 10.1143/JJAP.39.6277, 39, 11, 6277-6280, Vol.39, No.11, pp.6277--6280, 2000.11.
28. M. Maeda, Y. Oki, Y. Nonaka, S. Nakazono, Nonlinear Raman Spectroscopy without Tunable Laser and Application to Lidar, Proc. Conf. SPIE Int. Sympo. on Remote Sensing of the Atmosphere, Environment, and Space, 10.1117/12.417061, 4153, 30-41, pp.13, 2000.10.
29. N. J. Vasa, K. Saito, K. Ikuta, Y. Oki, M. Maeda, Development of a Compact Light Source at 1.67 Micrometer for Methane Leak Detection Using DIAL, Proc. Conf. SPIE Int. Sympo. on Remote Sensing of the Atmosphere, Environment, and Space, 10.1117/12.417081, 4153, 471-479, pp.14, 2000.10.
30. MAEDA M., Multi-stripe tunable waveguided DFB laser for New Type of Laser Spectroscopy, Technical Digest of CLEO/Europe 2000, 58, pp.58, 2000.09.
31. M. K. Kim, H. Ishii, T. Takao, Y. Oki, M. Maeda, Analysis of Trace Element in Solids by Using Laser Ablation Atomic Fluorescence Specrtosopy, Technical Digest Conf. Lasers and Electro-Optics CLEO/QELS 2000, pp.164, 2000.05.
32. 吉浦 豪, 苣木 雄一, 興 雄司[他], 導波型分布帰還固体色素レーザーのRGB領域発振, Research reports on information science and electrical engineering of Kyushu University, 10.15017/1515678, 5, 1, 141-146, Vol.5, No.1, pp.141--146, 2000.03, The laser operation of very compact tunable lasers based on the distributed feedback (DFB) dye lasers in plastic waveguide is evaluated. The tuning range is expanded to the RGB (Red-Green-Blue) region using only a frequency-tripled Nd:YAG laser pumping, and the tuning in each region is achieved by changing the interfering angle of the pump beam. This scheme is suitable for the integrated tunable lasers with some improvements..
33. 興 雄司, 吉浦 豪, 松岡 孝義[他], 導波型固体色素レーザーへの分布帰還構造作製, Research reports on information science and electrical engineering of Kyushu University, 10.15017/1515677, 5, 1, 135-140, Vol.5, No.1, pp.135--140, 2000.03, A grating structure was fabricated on Rhodamine6G doped PMMA film using holographic exposure and wet-etching technique, and distributed feedback (DFB) laser operations were demonstrated on the waveguided solidstate dye laser film. The performances of the fabricated DFB dye laser were evaluated and compared with those of holographically pumped DFB dye laser, and an improvement of diffraction efficiency was obtained. The threshold fluence of 800μJ/cm^2 and energy of 40μJ were achieved, and the wavelength tuning was demonstrated using thermal control..
34. M. Kim, H. Ishii, K. Taoka, Y. Oki, M. Maeda, Nanometer-Scale Surface Element Analysis in Polymers Using Laser Ablation Atomic Fluorescence Spectroscopy, J.Appl.Phys., 10.1063/1.371975, 87, 3, 1029-1033, Vol.87, No.3, pp.1029--1033, 2000.02.
35. K. Igarashi, M. Maeda, T. Takao, Y. Oki, H. Kusama, Dominant Factors of Preventing Rhodamine 6G form Dimer Formation in Aqueous Solutions, Bull.Chem.Soc.Jpn., 10.1246/bcsj.72.1197, 72, 6, 1197-1202, Vol.72, No.6, pp.1197--1202, 1999.10.
36. 生田 光輝, 工藤 務, 興 雄司[他], 漏洩メタン検知に用いる近距離高分解能1.67μmDIALシステム, Research reports on information science and electrical engineering of Kyushu University, 10.15017/1515803, 4, 2, 199-205, Vol.4, No.2, pp.199--205, 1999.09, A differential absorption lidar (light detection and ranging) system is developed as methane leakage detector using 1.67μm absorption band. A detection range of various 100m and 1000ppm•m is estimated by numerical calculation, and 30m resolution of detection is demonstrated experimentally. Since amplifier noise and telescope misalignment spoil the sensitivity and the range of the system, solutions are also proposed. Development of a compact optical parametric oscillator for a transmitter injection-seeded by a laser diode is also reported..
37. 中川 潤, 津村 陽一郎, 勝俣 賢二, レーザレーダによる広域メタンガス漏洩検知技術の開発, 三菱重工技報, 36, 5, 274-277, Vol.36, No.5, pp.274--277, 1999.09.
38. M. Maeda, T. Okada, Y. Oki, N. J. Vasa, Y. Nakata, Very Compact Tunable Lasers form Visible to IR Region, Proc. Int. Sympo. Laser-Aided Plasma Diagnostics (LAPD), pp.357--363, 1999.09.
39. Y. Oki, J. Takafuji, M. Maeda, Nonlinear Raman Spectroscopies with Raman Shifter for Sensitive Gas Detection, Technical Digest Conf. Lasers and Electro-Optics （CLEO/Pacific Rim '99）, pp.1192--1193, 1999.09.
40. M. Maeda, Y. Oki, O. Yamashita, K. Furukawa, Distributed Feedback Laser Operation of Dye Doped Plastic Waveguide, Technical Digest Conf. Lasers and Electro-Optics （CLEO/Pacific Rim '99）, pp.682-683, 1999.09.
41. K. Ikuta, N. J. Vasa, Y. Oki, M. Maeda, M. Uchiumi, Differential Absorption Lidar at 1.67$mu$m for the Detection of Methane Gas Leakage, Technical Digest Conf. Lasers and Electro-Optics （CLEO/Pacific Rim '99）, pp.274--275, 1999.09.
42. M. K. Kim, H. Ishii, K. Taoka, Y. Oki, M. Maeda, Application of Laser Ablation Atomic Fluorescence Spectroscopy for Nanometer Solid Surface Analysis, Technical Digest Conf. Lasers and Electro-Optics （CLEO/Pacific Rim '99）, pp.1194-1195, 1999.09.
43. K. Ikuta, T. Kudo, N. Yoshikane, N. J. Vasa, Y. Oki, M. Maeda, Geometrical Form Factor Improvement for Receiving System of Infrared Lidar, Optical Review, 10.1007/s10043-999-0464-y, 6, 5, 464-470, Vol.6, No.5, pp.464--470, 1999.06.
44. A. Ikeda, T. Sadou, H. Nagashima, K. Kouno, N. Yoshikawa, K. Tsukamoto, Y. Kuroki, Electronic Properties of MOS Capacitor Exposed to Inductively Coupled Hydrogen Plasma, Thin Solid Films, 10.1016/S0040-6090(99)00062-0, 345, 1, 172-177, Vol.345, No.1, pp.172--177, 1999.06.
45. N. J. Vasa, K. Ikuta, Y. Oki, M. Maeda, Remote Monitoring of Methane Gas Leakage at 1.67$mu$m by Differential Absorption Lidar, Technical Digest Conf. Lasers and Electro-Optics （CLEO'99）, pp.158, 1999.05.
46. Y. Oki, J. Takafuji, M. Maeda, Nonlinear Raman Spectroscopies with Raman Shifter for Sensitive Gas Detection, Technical Digest Conf. Lasers and Electro-Optics （CLEO'99）, pp.94, 1999.05.
47. 川田 則幸, 興 祐司, 高藤 潤哉, 前田 三男, 可変波長レーザーを用いない非線形ラマン分光法による大気中微量分子の検知, レーザー研究, 10.2184/lsj.27.194, 27, 3, 194-198, Vol.27, No.3, pp.194--198, 1999.03, A new technique for nonlinear Raman spectroscopy is proposed and discussed theoretically in terms of the detection of gas molecules in atmospheric pressure. In the proposed scheme, only a pulsed Nd: YAG laser is used as a pumping source, and instead of a tunable laser, a Raman shifter filled with the sametype of gas as that to be detected automatically generates the Raman shifted radiation. The detection limits of H2for SRGS (Stimulated Raman Gain Spectroscopy), PARS (Photo-Acoustic Raman Spectroscopy), and CARS (Coherent Anti-Stokes Raman Spectroscopy) are demonstrated experimentally, and the ppm order detection limit can be achieved by PARS. Although the sensitivity of CARS is smaller than that of PARS, the signal tonoise ratio in higher concentration is more effective..
48. Y. Oki, N. Kawada, Y. Abe, M. Maeda, Nonlinear Raman Spectroscopy without Tunable Laser for Sensitive Gas Detection in the Atmosphere, Optics Communication, 10.1016/S0030-4018(98)00660-9, 161, 1-3, 57-62, Vol.161, pp.57--62, 1999.02.
49. K. Ikuta, N. Yoshikane, N. J. Vasa, Y. Oki, M. Maeda, M. Uchiumi, Y. Tsumura, J. Nakagawa, N. Kawada, Differential Absorption Lidar at 1.67$mu$m for Remote Sensing of Methane Leakage, Jpn.J.Appl.Phys., 10.1143/JJAP.38.110, 38, 1A, 110-114, Vol.38, No.1A, pp.110--114, 1999.01.
50. Y. Oki, M. Maeda, Y. Abe, Sensitive Gas Detection in the Atmosphere with Newtype of Photo-Acoustic Raman and Coherent Anti-Stoke Raman Spectroscopy, Technical Digest. Conf. Laser Electro-Optics （CLEO'98）, pp.83, 1998.05.
Works, Software and Database
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Presentations
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Membership in Academic Society
  • the Japan Society of Apllied Physics
  • the Institute of Electrical Engineering in Japan
  • the Laser Society of Japan
  • Japan Sciety of Laser Surgery and Medicine
  • Spectroscopical Society of Japan
Educational
Other Educational Activities
  • 2011.11.


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