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List of Papers
Shiyoshi Yokoyama Last modified date：2023.11.22

Professor / Department of Advanced Device Materials / Institute for Materials Chemistry and Engineering


Papers
1. Shiyoshi Yokoyama, Jiawei Mao, Futa Uemura, Hiromu Sato, Guo-Wei Lu, 200 Gbit/s Transmitter Based on a Spin-on Ferroelectric Waveguide Modulator, IEEE Explore OFC, 10.1364/OFC.2023.Tu3C.2, Tu3C. 2, 2023.03.
2. Jiawei Mao, Futa Uemura, Shiyoshi Yokoyama, Design and Fabrication of MZI EO Modulator Based on Spin-on Epitaxial Photonic Materials
Platform, IEEE Xplore OECC, 10.23919/OECC/PSC53152.2022.9850081, 17, TuD1-3, 2022.06.
3. Junichi Fujikata, Masataka Noguchi, Tomoki Sakuma, Daisuke Okamoto, Yasuhiko Ishikawa, Shiyoshi Yokoyama, High Performance Si Photonics Devices and InP/EO Polymer Hybrid Optical Modulator for Data
Communication and Computing, IEEE Xplore OECC, 17, TuD-13, 2022.06.
4. Futa Uemura, Jiawei Mao, Shiyoshi Yokoyama, Epitaxial Electro-optical Thin Film and Waveguide on SiO2/Si Substrate, IEEE Xplore OECC, 10.23919/OECC/PSC53152.2022.9849935, 17, TuP-D-5, 2022.06.
5. Alisa Bannaron, Hiromu Sato, Shiyoshi Yokoyama, Organic Electro-optic (EO) Modulator for O-band Intra-datacenter, IEEE Xplore OECC, 10.23919/OECC/PSC53152.2022.9850013, 17, TuP-D-2, 2022.06.
6. HyunSuk Park, Sahar Alasvand Yazdani, Fatima Bencheikh, Ryutaro Komatsu, Shiyoshi Yokoyama, Takuro Kamiya, Chihaya Adachi, Control of emission diffraction angles and laser threshold in mixed-order sampled distributed feedback laser with organic gain media, J. Appl. Phys., 10.1063/5.0123476, 2022.11.
7. Hiromu Sato, Guo-Wei Lu, and Shiyoshi Yokoyama, Heterogeneous silicon-on-lithium niobate electro-optic modulator for 100-Gbaud modulation, Jiawei Mao,, APL Photonics, 10.1063/5.0109251, 2022.11, Integrated lithium niobate (LN) electro-optic (EO) modulators are emerging for applications in next-generation optical fiber communication
networks. To date, LN crystal waveguides have led the technology for high-speed modulators. On the other hand, on-chip LN modulators are
expected to realize scalable signaling devices with mature complementary metal–oxide–semiconductor technology. In this study, a siliconloaded LN modulator on the insulator substrate featuring a small footprint, a low driving voltage, and high-speed EO modulation is designed
and fabricated. No etching or patterning of the LN is required. The measured halfwave-voltage length product is 1.9 V cm with a static modulation extinction ratio of 17.9 dB. The fabricated LN modulator has a modulation bandwidth of 60 GHz and supports high-speed signaling at a data rate up to 200 Gbit/s..
8. Jianxun Hong, Kenta Rokumyo, Jiawei Mao, Alisa Bannaron, Hiromu Sato, and Shiyoshi Yokoyama, Efficient four-wave mixing wavelength conversion in hybrid silicon and polymer microring resonator, Optics Express, 10.1364/OE.475748, 2022.11.
9. Shiyoshi Yokoyama, Guo-Wei Lu, Hiromu Sato, Jiawei Mao, Alisa Bannaron, Highly Reliable Organic Polymer Optical Modulators, IEEE Xplore Optical Fiber Communicaions, 10.1364/OFC.2022.Th1J.4, Th1J. 4-1-Th1J. 4-3, 2022.06.
10. Jiawei Mao, Hiromu Sato, Alisa Bannaron, Jianxun Hong, Guo-Wei Lu, and Shiyoshi Yokoyama, Efficient silicon and side-cladding waveguide modulator with electro-optic polymer, Optics Express, 10.1364/OE.447616, 30, 2, 1885-1895, 2022.01.
11. Alisa Bannaron, Hiromu Sato, Shiyoshi Yokoyama, Fabrication of the electro-optic polymer modulator for O-band intra-datacenter communications, IEEE Xplore CPMT, 192-195, 2021.12.
12. Hiromu Sato, Jiawei Mao, Alisa Bannaron, and Takuro Kamiya, Guo-Wei Lu, and Shiyoshi Yokoyama, A 100 Gbaud On-off-keying Silicon-Polymer Hybrid Modulator Operating at up to 110°C, IEEE Photonics Technology Letters, 10.1109/LPT.2021.312694, 33, 24, 1507-1510, 2021.11.
13. Jiawei Mao, Alisa Bannaron, Hiromu Sato, Shiyoshi Yokoyama, Mode-Confined Ultra Thin Silicon/Polymer Hybrid Electro-Optic Modulator, IEEE Xplore CMPT, 10.1109/ICSJ52620.2021.96488, 112-115, 2021.11.
14. Hiromu Sato, Alisa Bannaron, Shiyoshi Yokoyama, O-Band Silicon-Organic Hybrid EO Modulator, IEEE Xplore IEEE CMPT, 10.1109/ICSJ52620.2021.964890, 196-199, 2021.11.
15. Guo-Wei Lu, Member, IEEE, Hong-Bo Zhang, Satoshi Shinada, Member, IEEE, Jianxun Hong, Yongpeng Cheng, and Shiyoshi Yokoyama, Power-efficient O-band 40 Gbit/s PAM4 Transmitter based on Dual-drive Cascaded Carrier-depletion and Carrier-injection Silicon Mach-Zehnder Modulator with Binary Driving Electronics at CMOS Voltages, IEEE Journal of Selected Topics in Quantum Electronics, 10.1109/JSTQE.2021.3056721, 27, 3, 1-8, 2021.03.
16. Zhenghao Yin, Kenta Sugiura, Hideaki Takashima, Ryo Okamoto, Feng Qiu, Shiyoshi Yokoyama, and Shigeki Takeuchi, Frequency correlated photon generation at telecom band using silicon nitride ring cavities
, Optics Express, 10.1364/OE.416165, 29, 4, 4821-4829, 2021.03.
17. Shiyoshi Yokoyama, Guo-Wei Lu, Xiaoyang Cheng, Feng Qiu, Andrew M Spring, 110 Gbit/s On-Off keying transmitter based on a single-drive polymer modulator, IEEE Xplore Optical Fiber Communications, /10.1364/OFC.2019.Tu2H.5, Tu2H.5-1-Tu2H.5-3, 2021.03.
18. Shiyoshi Yokoyama, Guo-Wei Lu, Feng Qiu, and Hiromu Sato, Ultra high speed silicon and polymer hybrid modulator 100 G baud transmission, Proceedings of IEEE Photonics Conference (IPC 2020), 10.1109/IPC47351.2020.9252333, MH.3, 2020.09.
19. Shiyoshi Yokoyama, Guo-Wei Lu, Feng Qiu, and Hiromu Sato, Single 120Gbit/s Operation of Silicon-Polymer Hybrid Modulator, Solid State Devices and Materials (SSDM 2020), 2020.09.
20. Shiyoshi Yokoyama, Guo-Wei Lu, Feng Qiu, Hiromu Sato, Ultra High Speed Silicon and Polymer Hybrid Modulator 100 Gbaud Transmission, IEEE Xplore IPC, 10.1109/IPC47351.2020.925233, 1-3, 2020.09.
21. Shiyoshi Yokoyama, Guo-Wei Lu, Feng Qiu, and Hiromu Sato , Ultra high speed silicon and polymer hybrid modulator 100 Gbaud transmission
, 2020 IEEE Optical Interconnect Conference , 2020.06.
22. Heiner Zwickel, Stefan Singer, Clemens Kinnger, Yasar Kutuvantavida, Nark Muradyan, Thorsten Wahlbrink, Shiyoshi Yokoyama, Sebastian Randel, Wolfgang Freude, and Christian Koos, A verified equivalent-circuit model for slotwaveguide modulators, Optics Express, doi.org/10.1364/OE.383120, 28, 12951-12976, 2020.03.
23. Alisa Bannaron, Andrew Spring, Shiyoshi Yokoyama, High-thermal stable poly (norbornene-dicarboximide) for electro-optic polymer modulator, Organic Photonic Materials and Devices XXII, 10.1117/12.2545453, 11277, 1127101, 2020.03.
24. Jianxun Hong, Andrew M. Spring, Feng Qiu, and Shiyoshi Yokoyama, A high efficiency silicon nitride waveguide grating coupler with multilayer bottom reflector, Scientific Reports, 9, 12988, 2019.09.
25. Shiyoshi Yokoyama, Guo-Wei Lu, Xiaoyang Cheng, Feng Qiu, Andrew M Spring, Tsubasa Kashino, Juro Ohshima, M-A Ozawa, Hideyuki Nawata, Efficient 110 Gbit/s OOK transmitter using silicon hybrid popymer modulator, Proceedings of ECOC, 10.1049/cp.2019.0852, 2019.09.
26. Zhenghao Yin, Kenta Sugiura, Xiaoyang Cheng, Hideaki Takashima, Ryo Okamoto, Shiyoshi Yokoyama, Shigeki Takeuchi, Design and fabrication of a silicon nitride ring resonator for on-chip broadband entangled photon sources, Proceedings of JSAP-OSA Joint Symposia, 21a_E214_7, 2019.09.
27. Guo-Wei Ly, Jianxun Hong, Hongbo Zhang, Feng Qiu, and Shiyoshi Yokoyama , DAC-less PAM4 transmitter using electro-optic polymer dual-drive Mach-Zehnder modulator with imbalanced binary driving electronics
, CLEO2019 , 2019.05.
28. Guo-Wei Lu, Jianxun Hong, Hongbo Zhang, Feng Qiu, Shiyoshi Yokoyama, DAC-less PAM4 Transmitter using Electro-optic Polymer Dual-drive Mach-Zehnder Modulator with Imbalanced Binary Driving Electronics, IEEE Xplore CLEO, 10.1364/CLEO_SI.2019.STh1N.7, STh1N. 7, 2019.05.
29. Andrew M. Spring, Feng Qiu, Jianxun Hong, Alisa Bannaron, Xiaoyang Cheng, Shiyoshi Yokoyama, Adamantyl and carbazole containing trans-poly(norbornene-dicarboximide)s as electro-optic chromophore hosts, Polymer, doi.org/10.1016/j.polymer.2019.04.015, 172, 382-390, 2019.04.
30. Shiyoshi Yokoyama, Guo-Wei Lu, Xiaoyang Cheng, Feng Qiu, Andrew M. Spring, 110 Gbit/s On-off Keying Transmission Based on a Single-drive Polymer Modulator, 2019 Optical Fiber Communication Conference and Exhibition (OFC), 2019.03.
31. S Yokoyama, GW Lu, X Cheng, F Qiu, Long-term Stable Electro-optic Polymer for Hybrid Integration, Proceedings of Optical Fiber Communications, 10.1364/OFC.2019.M3D.4, M3D.4-1-M3D4-3, 2019.03.
32. X. Cheng, F. Qiu, A. M. Spring, M. Sasaki, T. Kashino, M. Ozawa, H. Nawata, T. Kita, O. Sugihara, and S. Yokoyama, Camera Sensor Platform for High Speed Video Data Transmission Using a Wideband Electro-Optic Polymer Modulator
, Optics Express, https://doi.org/10.1364/OE.27.001877, 27, 3, 1877-1883, 2019.01.
33. Alisa Bannaron, Andrew Mark Spring, Shiyoshi Yokoyama, Electro-optic (EO) polymer with highly thermal stable norbornene-based polymer backbone, Organic Photonic Materials and Devices XXI, /10.1117/12.2508328, 10915, 109150K, 2019.01.
34. Clemens Kieninger, Yasar Kutuvantavida, Hiroki Miura, Juned N. Kemal, Heiner Zwickel, Feng Qiu, Matthias Lauermann, Wolfgang Freude, Sebastian Randel, Shiyoshi Yokoyama, and Christian Koos, Demonstration of long-term thermally stable Silicon-Organic Hybrid Modulators at 85 °C, Optics Express , https://doi.org/10.1364/OE.26.027955, ２６, 27955-27964, 2018.11.
35. Clemens Kieninger, Yasar Kutuvantavida, Hiroki Miura, Juned N. Kemal, Heiner Zwickel, Feng Qiu, Matthias Lauermann, Wolfgang Freude, Sebastian Randel, Shiyoshi Yokoyama, Christian Koos, Demonstration of long-term thermally stable Silicon-Organic Hybrid Modulators at 85 °C, arXiv, 1807.00774, 2018.09.
36. C. Kieninger, Y. Kutuvantavida, J. N. Kemal, H. Zwickel, H. Miura, S. Randel, W. Freude, Shiyoshi Yokoyama, C. Koos , Demonstration of Long-Term Thermal Stability of a Silicon-Organic Hybrid (SOH) Modulator at 85°C

, 2018 Conference on Lasers and Electro-Optics, CLEO 2018, 2018.08.
37. Shiyoshi Yokoyama, G. W. Lu, H. Miura, Q. Feng, Andrew Mark Spring , 96 Gbit/s PAM-4 Generation using an Electro-Optic Polymer Modulator with High Thermal Stability
, 2018 Conference on Lasers and Electro-Optics, CLEO 2018, 2018.08.
38. S. Yokoyama, G. -W Lu, H. Miura, Q. Feng, and A. M. Spring, High Temperature Resistant 112 Gbit/s PAM4 Modulator Based on Electro-optic Polymer Modulator, 44th Europian COnference on Optical Communication (ECOC), 2018.08.
39. Jianxun Hong, Feng Qiu, Andrew. M. Spring, and Shiyoshi Yokoyama, A High Efficiency and Wide Bandwidth Segmented Silicon Grating Coupler, Applied Optics, https://doi.org/10.1364/AO.57.003301 , 57, 3301-3305, 2018.04.
40. Feng Qiu, Andrew. M. Spring, Jianxun Hong, and Shiyoshi Yokoyama, Plate-slot Polymer Waveguide Modulator on Silicon-on-insulator, Optics Express, https://doi.org/10.1364/OE.26.011213, 26, 11213-11221, 2018.04.
41. Feng Qiu, Andrew. M. Spring, Jianxun Hong, Hiroki Miura, Tsubasa Kashino, Takamasa Kikuchi, Masaaki Ozawa, Hideyuki Nawata, Keisuke Odoi, and Shiyoshi Yokoyama, Electro-optic Polymer Ring Resonator Modulator on a Flat Silicon-on-Insulator, Laser & Photonics Review , https://doi.org/10.1002/lpor.201700061 , １１, 1700061 1-6, 2017.11.
42. Andrew Mark Spring, QIU FENG, Crosslinked poly(norbornene-dicarboximide)s as electro-optic chromophore hosts, Alisa Bannaron, Tsubasa Kashino, Kikuchi, Masaaki, Hideyuki Nawata, Keisuke Odoi, Shiyoshi Yokoyama, Crosslinked poly(norbornene-dicarboximide)s as electro-optic chromophore hosts, European Polymer Journal, 97, 263-271, 2017.10.
43. Hiroki Miura, QIU FENG, Andrew Mark Spring, Tsubasa Kashino, Takamasa Kikuchi, Masaaki Ozawa, Hideyuki Nawata, Keisuke Odoi, Shiyoshi Yokoyama, High thermal stability 40 GHz electro-optic polymer modulators, Optics Express, 25, 28643-28649, 2017.10.
44. Jianxun Hong, QIU FENG, Xiaoyang Chen, Andrew Mark Spring, Shiyoshi Yokoyama, A high-speed electro-optic triple-microring resonator modulator, Scientific Reports, 7, 4682-4682-6, 2017.07.
45. Xiaoyan Cheng, Jianxun Hong, Andrew Mark Spring, Shiyoshi Yokoyama, Fabrication of a high-Q factor ring resonator using LSCVD deposited Si3N4 film, OPTICAL MATERIALS EXPRESS, 10.1364/OME.7.002182, 7, 7, 2182-2187, 2017.07.
46. Andrew Mark Spring, QIU FENG, Jianxun Hong, Alisa Bannaron, Shiyoshi Yokoyama, Electro-optic properties of a side chain poly(norbornenedicarboximide) system with an appended phenylvinylene thiophene chromophore, Polymer, 119, 13-27, 2017.05.
47. Hiromu Sato, Hiroki Miura, QIU FENG, Andrew Mark Spring, Tsubsa Kashino, Takamasa Kikuchi, Masaako Ozawa, Keisuke Odoi, Shiyoshi Yokoyama, Low Driving Voltage Mach-Zehnder Interference Modulator Constructed from an Electro-optic Polymer on Ultr-thin Silicon with a Broadband Operation, Optics Express, http://dx.doi.org/10.1364/OE.25.000768, 25, 768-775, 2017.01.
48. QIU FENG, Hiroki Miura, Andrew Mark Spring, Daisuke Maeda, Masaaki Ozawa, Jianxun Hong, Keisuke Odoi, Shiyoshi Yokoyama, An electro-optic polymer-cladded TiO2 waveguide modulato, Appl. Phys. Lett., http://dx.doi.org/10.1063/1.4966272, 109, 173301-1-173301-4, 2016.10.
49. Andrew Mark Spring, QIU FENG, Shiyoshi Yokoyama, High stability poly(N-adamantyl-exo-norbornene-5,6-dicarboximide) and phenyl vinylene thiophene electro-optic host-guest system, European Polymer Journal, 84, 89-99, 2016.09.
50. QIU FENG, Shiyoshi Yokoyama, Efficiently poled electro-optic polymer modulators, Optics Express, 24, 19020-19025, 2016.08.
51. QIU FENG, Andrew Mark Spring, Hiroki Miura, Daisuke Maeda, Masa-aki Ozawa, Keisuke Odoi, Shiyoshi Yokoyama, Athermal Hybrid Silicon/Polymer Ring Resonator Electro-optic Modulator, ACS Photonics , 10.1021/acsphotonics.5b00695, 3, 780-783, 2016.04.
52. Qiu Feng, Hiromu Sato, Andrew M. Spring, Daisuke Maeda, Masa-aki Ozawa, Keisuke Ozawa, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, Ultra-thin silicon/electro-optic polymer hybrid waveguide modulators, Appl. Phys. Lett., 10.1063/1.4931490, 107, 123302-1-123302-5, 2015.09.
53. Qiu Feng, Andrew M. Spring, Shiyoshi Yokoyama, Athermal and high-Q hybrid TiO2–Si3N4 ring resonator via an etching-free fabrication technique, ACS Photonics, 10.1021/ph500450n, 2, 405-409, 2015.04.
54. Qiu Feng, Andrew M. Spring, Disuke Maeda, Masaaki Ozawa, Keisuke Odoi, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, A hybrid electro-optic polymer and TiO2 double-slot waveguide modulator, Scientific Reports, 10.1038/srep08561, 5, 8561-1-8561-6, 2015.03, 酸化チタン細線導波路と電気光学ポリマーを使ったハイブリッド光変調デバイスを作製し、理論的な解析と光学計測によって優れた光学特性を評価した。光導波路の電気光学定数は140pm/Vであり、ダブルスロット構造を持つ光導波路内で光変調特性が増強していることを明にした。また、光変調の動作電圧は1.6Vであり、従来の無機系光変調デバイスを凌駕する低電力動作も確認された。.
55. Andrew M. Spring, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi, Qiu Feng, Kazuhiro Yamamoto, Shiyoshi Yokoyama, An Analysis of the Structural, Thermal and Optical Characteristics as well as the Electrical Resistivity of tert-butyldiphenylsilyl Substi-tuted Poly(norbornene-dicarboximide)s, Polymer, 56, 189-198, 2014.12.
56. Andrew M. Spring, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi, Qiu Feng, Kazuhiro Yamamoto, Shiyoshi Yokoyama, Glass Transition Temperature Control by Poly(norbornene-dicarboximide) Copolymers, Polymer Bulletin, 10.1007/s00289-014-1283-2, 2014.11.
57. QIU FENG, SPRING ANDREW, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi, Akira Otomo, Shiyoshi Yokoyama, A Straightforward Electro-optic Polymer Covered Titanium Dioxide Strip Line Modulator with a Low Driving Voltage, Applied Physics Letters, 105, 073305-1-073305-4, 2014.08.
58. Qiu Feng, Andrew M. Spring, D. Maeda, M. Ozawa, K. Odoi, I. Aoki, A. Otomo, Shiyoshi Yokoyama, TiO2 ring-resonator-based EO polymer modulator, Optics Express, 22, 14101-14107, 2014.06.
59. Andrew M. Spring, Feng Yu, Qiu Feng, Kazuhiro Yamamoto, Shiyoshi Yokoyama, The preparation of well-controlled poly(N-cyclohexyl-exo-norbornene-5,6-dicarboximide) polymers, Polymer J. , 10.1038/pj.2014.26, 2014.05.
60. Yue Jya, Andrew Spring, Kazuhiro Yamamoto, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, A Norbornene polymer brush for electro-optic applications, Thin Solid Films, 10.1016/j.tsf.2013.06.071, 554, 175-179, 2014.02.
61. Yue Jia, Andrew M. Spring, Qiu Feng, Yu Feng, Kazuhiro Yamamoto, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, Electro-optic properties of a bi-chromophore norbornene polymer brush system, Japn. J. Appl. Phys. , 53, 01AF04-1-01AF04-5, 2014.01.
62. Qiu Feng, Andrew Spring, Yu Feng, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, Electro-optic polymer / titanium dioxide hybrid core ring resonator modulators, Laser Photoncis Revew, 7, 84-88, 2013.11.
63. Qiu Feng, Andrew Spring, Yu Feng, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, Thin TiO2 core and electro-optic polymer cladding waveguide modulators , Appl. Phys. Lett, 102, 233504-1--3, 2013.07.
64. Kazuhiro Yamamoto, Shiyoshi Yokoyama, Akira Otomo, On-chip superfocusing of surface plasmon using metal-coat tapered optical fiber pairs with nano-gap structures, Proc SPIE, 8632, 863228-1-863228-8, 2013.02.
65. Kazuhiro Yamamoto, Feng Yu, Lu Li, Shiyoshi Yokoyama, Akira Otomo, Kei Yasui, Masaaki Ozawa, Electro-optic waveguide with conductive chromophore contained polymer cladding, Proc SPIE, 8622, 86221K-1-86221K-6, 2013.02.
66. Feng Yu, A. M. Spring, Lu Li, Feng Qiu, Kazuhiro Yamamoto, Daisuke Maeda, Masaaki Ozawa, Keisuke Oodoi, Shiyoshi Yokoyama, An Enhanced Host-guest Optical Polymer System using Poly(norbornene-dicarboximide) via ROMP, J. Polym. Scie. A, 51, 1278-2184, 2012.12.
67. Feng Qiu, Feng Yu, Andrew M. Spring, and Shiyoshi Yokoyama, Thermal-sensitive wavelength filter based on polymer waveguide and polarization-maintaining fiber, J. Opt. Soc. Am. B, 29, 3069-3071, 2012.11.
68. F. Qui, F. Yu, A. M. Spring, and S. Yokoyama, An Athermal Silicon Nitride Ring Resonator by Photobreaching DR1/PMMA Polymer, Opt. Lett., 37, , 4086-4088, 2012.09.
69. X. Piao, X. Zhang, S. Inoue, S. Yokoyama, I. Aoki, H. Miki, A. Otomo, and H. Tazawa, Enhancement of Electro-Optic Activity by Introduction of a Benzyloxy Group to Conventional Donor-p-acceptor Molecules, Organic Electronics, 12, 1093-1097, 2011.05.
70. X. Piao, Z. Zhang, Y. Mori, M. Koishi, A. Nakaya, S. Inoue, I. Aoki, A. Otomo, and S. Yokoyama, Nonlinear Optical Side-chain Polymers Postfunctionalized with High-β Chromophores Exhibiting Large Electro-optic Property
, J. Polym. Sci. Part A, 49, 47-54, 49, 47-54, 2011.01.
71. X. Zhang, I. Aoki, X. Piao, S. Inoue, H. Tazawa, S. Yokoyama, and A. Otomo , Effect of Modified Donor Units on Molecular Hyperpolarizability of Thienyl-Vinylene Nonlinear Optical Chromophores
, Tetrahedron Lett., 51, 5873-5876, 51, 5873-5876, 2010.09.
72. Azusa Inoue, Shin-ichiro Inoue, Shiyoshi Yokoyama, Enhanced electro-optic response of a poled polymer in a reflective microcavity, Optics Communications, 283, 2935-2938, 2010.07.
73. Xingsheng Xu, Toshiki Yamada, and Shiyoshi Yokoyama, Modification of two-photon excited fluorescence from quantum dots on SiN photonic crystals, Optics Letters, 35, 3, 309-311, 35, 3, 309-311, 2010.02.
74. X. Piao, Y. Mori, X. Piao, S. Inoue, and S. Yokoyama, Hyper-branched Polymer for Electro-optic Applicaitons, Proc SPIE, 7599, G1-G10, 7599, G1-10, 2010.01.
75. K. Sasaki, S. Inoue, K. Nishio, H. Masuda, A. Otomo, and S. Yokoyama, Polymer Micro-structure Embedded in Two-Dimensional Photonic Crystals, Opt. Mater., 32, 543-546, 32, 543-546, 2010.01.
76. X. Xu, T. Yamada, and S. Yokoyama, Correlation between Antibunching and Blinking of Photoluminescence from a CdSe/ZnS Quantum Dot, Eur. Phys. J. D, 55, 691-697, 55, 691-697, 2009.11.
77. S. Inoue and S. Yokoyama, Numerical Simulation of an Ultra-compact Electro-optic Modulator Based on Nanoscale Plasmon Metal Gap Waveguides, Elec. Lett., 45, 1087-1088, 45, 1087-1088, 2009.11.
78. S. Furumi, A. Otomo, S. Yokoyama, and S. Mashiko, Photochemical and Photophysical Reactions of Poly(propylene imine) Dendrimers Tethering Cinnamamide Groups, Polymer, 50, 2944-2952, 50, 2944-5952, 2009.05.
79. S. Inoue and S. Yokoyama, Nonlinear Optical Responses in Two-Dimensional Photonic Crystals, Thin Solid Films, 518, 470-472, 2009.02.
80. X. Piao, S. Inoue, S. Yokoyama, H. Miki, I.. Aoki, A. Otomo, H. Tazawa, Synthesis and Characterization of Binary Chromophore Polymers for Eelectro-optic Application, Thin Solid Films, 518, 481-484, 518, 481-484, 2009.02.
81. S. Inoue and S. Yokoyama, Enhancing the two-photon excited fluorescence by two-dimensional nonlinear optical-polymer photonic crystals, Proc. SPIE Int. Soc. Opt. Eng., 7212, 72131I1-8 (2009), 2009.02.
82. A. Inoue,S. Inoue,S. Yokoyama,K. Kojima,K. Yasui,M. Ozawa, and O. Masaaki, One dimensional polymeric photonic crystal doped with second-order nonlinear optical chromophore, Proc. SPIE Int. Soc. Opt. Eng., 7213, 72131C1-8 (200), 2009.02.
83. S. Inoue and S. Yokoyama, Enhancement of two-photon excited fluorescence in two-dimensional nonlinear optical polymer photonic crystal waveguides, Appl. Phys. Lett., 93, 11110-1-5, 2008.09.
84. S. Yokoyama, S. Inoue, and K. Sasaki, Two-photon polymer laser writing in the photonic crystal, Proc. SPIE, 7049, 70490K1-8(2008), 2008.08.
85. Y. Noguchi, R. Ueda, T. Kubota, T. Kamikado, S. Yokoyama, and T. Nagase, Observation of negative differential resistance and single-electron tunneling in electromigrated break junctions, Thin Solid Films, 516, pp. 2762-2766 (2008), 2008.03.
86. Y. Okuno and S. Yokoyama, Theoretical study of molecular rectificafion in porphyrin dimer, Thin Solid Films, 516, pp. 2630-2634 (2008), 2008.03.
87. T. Yamada, H. Shinohara, T. Kamikado, Y. Okuno, H. Suzuki, S. Mashiko, and S.Yokoyama, Nanosecond and femtosecond mass spectroscopic analysis of a molecular beam produced by the spray-jet technique, Thin Solid Films, 516, pp. 2522-2526 (2008), 2008.03.
88. Y. Naitoh, A. Otomo, H. Miki, I. Aoki, and S. Yokoyama, The fluorescence behavior from SAM of dendron with rhodamine B as a center, Thin Solid Films, 516, pp. 2371-2375 (2008), 2008.03.
89. T. Nakahama, S. Yokoyama, H. Miki, and S. Mashiko, Control of Multiphoton Process within Diffraction Limit Space in Polymer Microstructures, Thin Solid Films, 499, pp. 406-409 (2006), 2008.03.
90. K. Kurihara, A. Otomo, A. Syouji, J. Takahara, K. Suzuki, and S. Yokoyama, Superfocusing modes of surface plasmon polaritons in conical geometry based on the quasi-separation of variables approach, J. Phy. A, MAT. THEO., 40, pp. 12479-12503 (2007), 2007.08.
91. T. Yamada, H. Shinohara, S. Mashiko, and S. Yokoyama, Analysis of a molecular beam produced by the spray-jet technique with femtosecond laser mass spectroscopy, Mol. Crys. Liq. Crys, 472, pp. 561-569 (2007), 2007.06.
92. F. Nishiyama, T. Yokoyama, T. Kamikado, S. Yokoyama, S. Mashiko, K. Sakaguchi, K. Kikuchi, Interstitial accommodation of C-60 in a surface-supported supramolecular network, Adv. Mater., 19, pp. 117-120 (2007), 2007.03.
93. T. Kamikado, T. Sekiguchi, S. Yokoyama. and S. Mashiko, Control of Single Supramolecular Chain of Porphyrin ona Copper Surface, Thin Solid Films, 499, 329-332 (2006), 2007.03.
94. S. Yokoyama, Single-mode polymer DBR lasers with two-dimensional microcavity structures, IEICE TRANS. ELECT., E90C, pp. 135-138 (2007), 2007.01.
95. S. Yokoyama, T. Nakahama, and S. Mashiko, Two-photon-photopolymeric Micro-nano Fabrication fot Polymer Device Applications, Proc. SPIE, 6376 (2006), 2007.01.
96. S. Yokoyama, Single-mode Polymer DFB Lasers with Two-dimensional Microcavity Structures, IEICE Transactions on Electronics, E90, 135 (2007), 2007.01.
97. F. Nishiyama, T. Yokoyama, T. Kamikado, S. Yokoyama, and S. Mashiko, Interstitial Accomodation of C-60 in a Surface-supported Supramolecular Network, Adv. Mater., 19, 117 (2007), 2007.01.
98. F. Nishiyama, T. Yokoyama, T. Kamikado, S. Yokoyama, and S. Mashiko, Layer-by-Layer Growth of Porphyrin Supermolecular Thin Films, Appl. Phys. Lett, 88, pp. 253113 1-3 (2006), 2006.06.
99. T. Terui, S. Yokoyama, H. Suzuki, S. Mashiko, M. Sakurai, and T. Moriwaki, Structure of Thin Films of Tertiary-phenyl-porphyrin Derivatives on Gold Surface, Thin Solid Films, 499, pp. 157-160 (2006), 2006.03.
100. S. Furumi, S. Yokoyama. A. Otomo, and S. Mashiko , Control of Photonic bandgap in Chiral Liquid Crystals for Distributed Feedback Effect, Thin Solid FIlms, 2006.03.
101. T. Terui, S. Yokoyama, H. Suzuki, and S. Mashiko, Structure of Thin Films of Tertiary-phenyl-porphyrin Derivatives on Gold Surface, Thin Solid Films, 499, 157-160 (2006), 2006.03.
102. S. Yokoyama, T. Nakahama, H. Miki, and S. Mashiko, Two-phoron-Induced Polymerization in a Photonic Crystal Template for Optical Device Application , Abst. Paper of the Am. Chem. Soc., 231, 69 (2006), 2006.03.
103. H. Miki, A. Otomo, S. Yokoyama, and S. Mashiko, Synthesis and Luminescence Properties of Benzylthioether Dendrons Bearing Rhodamine B at the Focal Point, Thin Solid Films, 499, pp. 333-337 (2006), 2006.03.
104. H. Masuda, M. Yamada, F. Matsumoto, S. Yokoyama, S. Mashiko, M. Nakao, and K. Nishio, Lasing from Two-dimensional Photonic Crystals Using Anodic Porous Alumina, Adv. Mater., 18, pp. 213-126 (2006), 2006.02.
105. S. Yokoyama, S. Mashiko, H. Kikuchi, K. Uchida, and T. Nagamura, Laser Emission from a Polymer-Stabilized Liquid Crystaline Bule Phase, Adv. Mater., 18, pp. 48-51 (2006), 2006.01.
106. S. Yokoyama, T. Nakahama, S. Mashiko, M. Nakao, M. Yamada, K. Nishio, and H. Masuda, Photonic Crystal Templates for Organic Solid-state Laser, Appl. Phys. Lett., 87, pp. 191101 1-3 (2005), 2005.11.
107. S. Yokoyama, T. Nakahama, and S. Mashiko, Amplified Spontaneous Emission and Laser Emission from a High Optical-gain medium of Dye-doped Dendrimer, J. Luminescence, 111, pp. 285-290 (2005), 2005.04.
108. S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, Phototunable Photonic Band-gap in a Chiral Liquid Crystal Laser Device, Appl. Phys. Lett, 84, pp.2491-2493 (2004), 2005.04.
109. X. L. Guo, Z. C. Dong, A. S. Trifonov, K. Miki, Y. Wakayama, K. Kimura, S.Yokoyama, and S. Mashiko, Nanoscale Organic Electroluminescence from Tunnel Junctions, Phys. Rev. B, 70, pp. 2332041-4 (2004).
110. T. Yokoyama, T. Kamikado, S. Yokoyama, and S. Mashiko, Conformation Selective Assembly of Carboxyphenyl Substituted Porphyrins on Au (111), J. Chem. Phys., 121, pp. 11993-11997 (2004).
111. T. Sekiguchi, Y. Wakayama, S. Yokoyama, T. Kamikado, and S. Mashiko, Adsorption-induced Conformation Changes of Phorphyrin Derivatives and Formation of Twin Superstructures on a Copper Surface, Thin Solid Films, 464, pp. 393-397 (2004).
112. Z. C. Dong, X. L. Guo, A. S. Trifonov, P. S. Dorozhkin, K. Miki, K. Kimura, S. Yokoyama, and S. Mashiko, Vibrationally Resolved Fluorescence from Organic Molecules Near Metal Surface in a Scanning Tunneling Microscope, Phys. Rev. Let., 92, pp. 86801-4 (2004).
113. X. L. Guo, Z. C. Dong, A. S. Trifonov, S. Yokoyama, S. Mahsiko, and T. Okamoto, Tunneling-electron-induced Molecular Luminescence from a Nanoscale Layer of Organic Molecules on Metal Substrates, Appl. Phys. Lett, 84, pp. 969-971 (2004).
114. S. Yokoyama, T. Nakahama, H. Miki, and S. Mashiko, Two-photon-induced Polymerization in a Laser Gain Medium for Optical Microstructure, Appl. Phys. Lett, 82, pp. 3221-3223 (2003).
115. S. Yokoyama and S. Mahsiko, Tuning of Laser Frequency in Random Media of Dye-doped Polymer and Glass Particle Hybrid, Jpn. J. Appl. Phys, 42, pp. L970-973 (2003).
116. S. Yokoyama, T. Nakahama, H. Miki, and S. Mashiko, Fabrication of Three-dimensional Microstructure in an Optical Gain Medium Using Two-photon-induced Photopolymerization Technique, Thin Solid Films, 438, pp. 452-456 (2003).
117. S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, Electrical Control of the Structure and Lasing in Chiral Photonic Band-gap Liquid Crystals, Appl. Phys. Lett, 82, pp. 16-18 (2003).
118. S. Furumi, A. Otomo, S. Yokoyama, and S. Mashiko, Effective Photocrosslinking Reaction of Dendrimers through Triplet Energy Transfer, Thin Solid Films, 438, pp. 85-89 (2003).
119. S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, Study on Laser Action from UV-curable Chiral Nematic Liquid Crystals, Thin Sold Films, 438, pp. 423-427 (2003).
120. H. Suzuki, H. Miki, S. Yokoyama, and S. Mashiko, Segregation of Molecular Overlayers with Different Structures on a Metal Surface, Thin Solid Films, 437, pp. 97-100 (2003).
121. Y. Okuno, T. Kamikado, S. Yokoyama, S. Mashiko, Determining the Conformation of a Phenyene-linked porphyrin Dimer by NMR Spectroscopy and Quantum Chemical Calculations, J. Mol. Structure-Theochem, 631, pp. 13-20 (2003).
122. H. Suzuki, H. Miki, S. Yokoyama, and S. Mashiko, Molecule Isomers by Using a Scanning Tunneling Microscope, J. Phys. Chem. B, 107, pp. 3659-3662 (2003).
123. Z. C. Dong, A. Kar, R. Dorozhkin, K. Amemiya, T. Uchihashi, S. Yokoyama, K. Kamikado, S. Mashiko, and T. Okamoto, Tunneling Electron Induced Luminescence from Monolayered Cu-TBP Porphyrin molecules adsorbed on Cu (100), Thin Solid Films, 438, pp. 262-267 (2003).
124. X. L. Guo, Z. ?C. Dong, A. Trifonov, S. Yokoyama, S. Mashiko, and T. Okamoto, Light Emission from Organic Molecules on Metal Substrate Induced by Tunneling, Jpn, J. Appl. Phys, 42, pp. 6937-6940 (2003).
125. Z. C. Dong, A. Trifonov, X. ?L. Guo K. Amemiya, S. Yokoyama, T. Kamikado, T. Yamada, S. Mashiko, and T. Okamoto, Tunneling Electron Induced Photon Emission from Monolayered H2TBPP porphyrin on Cu (100), Surface Science, 532, pp. 237-243 (2003).
126. S. Yokoyama, A. Otomo, and S. Mashiko, Laser Emission from High-gain media of Dye-doped Dendrimer, Appl. Phys. Lett, 80, pp. 7-9 (2002).
127. S. Yokoyama, T. Nakahama, A. Otomo, and S. Mashiko,, Suprafluorescence Action from Rhodamine-cored Dendrimer, Coll. Surf. A, 198, pp. 433-438 (2002).
128. A. Otomo, S. Otomo, S. Yokoyama, and S. Mashiko, Photochemical Stability of Encapsulated Laser Dyes in Dendritic Nanoboxes Against Singlet Oxygen, Opt. Lett., 27, pp. 891-893 (2002).
129. S. H. Lee, A. Otomo, T. Nakahama, T. Yamada, T. Kamikado, S. Yokoyama and S. Mashiko, Novel Rigid-rod 2,6-Diphenylbenzo[1,2-d:4,5-d’]bisthiazole (DPBBT) Derivatives for Second-order Nonlinear Optical Chromophores, J. Mater. Chem., 12, pp. 2187-2188 (2002).
130. Y. Okuno, T. Kamikado, S. Yokoyama, and S. Mashiko, Theoretical Study of Aryl-ring Rotation in Arylphorphyrins, J. Mol. Structure-Theochem, 594, pp. 55-60 (2002).
131. Z. C. Dong, A. Kar, Z. ?Q. Zou, T. Oghi, P. Dorozhkin, D. Fujita, S. Yokoyama, T. Terui, T. Yamada, T. Kamikado, M. Zhou, S. Mashiko, and T. Okamoto, Light Emission from Porphyrin Molecules Induced by a Scannin Tunneling Microspce, Jpn. J. Appl. Phys., 41, pp. 4898-4902 (2002).
132. H. Yanagi, H. Mukai, K. Ikuta, T. Shibutani, T. Kamikado, S. Yokoyama, and S. Mashiko, Molecularly Resolved Dynamics for Two-dimensional Nucleation of Supramolecular Assembly, Nano Lett., 2, pp. 601-604 (2002).
133. D. Fujita, T. Ohgi, W. Deng, H. Nejo, T. Okamoto, S. Yokoyama, and S. Mashiko, STM Induced Photon Emission from Adsorbed Porphyrin Molecules on a Cu(100) Surface in Ultrahigh Vacuum, Surface Science, 454, pp. 1021-25 (2002).
134. Y. Okuno, T. Yokoyama, S. Yokoyama, T. Kamikado, and S. Mashiko, Theoretical Study of Benzonitrile Clusters in the Gas Phase and Adsorption onto a Au(111)-surface, J. Am. Chem. Soc., 124, pp. 7218-7225 (2002).
135. W. Deng, D. Fujita, T. Ohgi, S. Yokoyama, K. Kamikado, and S. Mashiko, STM-induced Photon Emission from Self-assembled Porphyrin Molecules on a Cu (100) surface, J. Chem. Phys., 117, pp. 4995-5000 (2002).
136. Y. Yamaguchi, S. Yokoyama, and S. Mashiko, Strong Coupling of the Single Excitation in the Q-like Bands of Phenylene-linked Free-base and Zinc Bacteriochlorin Dimers: A Time-dependent Density Functional Theory Study, J. Chem. Phys., 116, pp. 6541-6548 (2002).
137. M. Zhou, A. Otomo, S. Yokoyama, and S. Mashiko, Estimation of Organic-molecular Film Structure using Surface-plasmon Resonance Spectroscopy, Thin Sold Films, 393, pp. 114-118 (2001).
138. A. Otomo, S. Otomo, S. Yokoyama, and S. Mashiko, Stimulated Emission in Dendrimer-doped Polymer Waveguide, Thin Solid Films, 393, pp. 278-283 (2001).
139. Y. Okuno, S. Yokoyama, and S. Mashiko, Interaction between Monomeric Units of Donor-Acceptor Functionalized Azobenzene Dendrimers: Effects on Macroscopic Configuration and First Hyperpolarizability, J. Phys. Chem. B, 105, pp. 2163-2169 (2001).
140. Y. Yamaguchi, Y. Yokomichi, S. Yokoyama, and S. Mashiko, Theoretical Prediction of First-order Hyperpolarizabilities of Azobenzene Dendrimers,, J. Mol. Structure-Theochem., 545, pp. 187-196 (2001).
141. Y. Yamaguchi, Y. Yokomichi, S. Yokoyama, and S. Mashiko, Time-dependent Density Functional Calculations of the Q-like Bands of Phenylene-linked Free-base and Zinc Porphyrin Dimers, Int. J. Quantum Chem., 84, pp. 338-347 (2001).
142. T. Yokoyama, S. Yokoyama, T. Kamikado, and S. Mashiko, Nonplanar Adsorption and Orientational Ordering of Porphyrin Molecules on Au (111), J. Chem. Phys., 115, pp. 3814-3818 (2001).
143. T. Kubota, S. Yokoyama, T. Nakahama, S. Mashiko, Y. Noguchi, Y. Majima, and M. Iwamoto, Effect of the Metal/organic Interface Phenomena on the Current-voltage Characteristics of Organic Single Electron Tunneling Device,, Thin Solid Films, 393, pp. 379-382 (2001).
144. D. Fujita, T. Ohgi, W. Deng, K. Ishige, T. Okamoto, S. Yokoyama, and S. Mashiko, Photon Emission Induced by Tunneling Electrons from a Cu(100) Surface Covered with Porphyrin Molecules, Surface Science, 193, pp. 702-707 (2001).
145. T. Yokoyama, S. Yokoyama, T. Kamikado, Y. Okuno, and S. Mashiko, Selective Assembly on a Surface of Supramolecular Aggregates with Controlled Size and Shape, Nature, 413, pp. 619-621 (2001).
146. S. Yokoyama, T. Nakahama, A. Otomo, and S. Mashiko, Intermolecular Coupling Enhancement of the Molecular Hyperpolarizability in Multi-choromophoric Dipolar Dendrons, J. Am. Chem. Soc., 122, pp. 3174-3181 (2000).
147. S. Yokoyama and S. Mashiko, Intermolecular Coupling Enhancement of the Molecular Hyperpolarizability in NLO Dendrimers, Nonlinear Optics, 24, pp. 47-50 (2000).
148. S. Yokoyama, S. Mashiko, Y. Yamaguchi, and Y. Yokomichi, Computational and Experimental Studies of Azobenzene Dendrons for Nonlinear Optical Applications, Polym. Adv. Tech., 11, pp. 692-697 (2000).
149. A. Otomo, S. Yokoyama, T. Nakahama, and S. Mashiko, Super-narrowing Mirrorless Laser Emission in Dendrimer-doped Polymer Waveguide, Appl. Phys. Lett., 77, pp. 3881-3883 (2000).
150. Y. Okuno, S. Yokoyama, and S. Mashiko, Ab. Initio Calculations of First Hyperpolarizability for Donor-Acceptor Azobenzene and their Dimers, Nonlinear Optics, 26, pp. 83-90 (2000).
151. Y. Yamaguchi, Y. Yokomichi, S. Yokoyama, and S. Mashiko, Molecular Design of Novel Azobenzene Dendrimers, Polym. Adv. Tech., 11, pp. 674-684 (2000).
152. D. Fujita, T. Ohgi, W. ?L. Deng, H. Hejo, T. Okamoto, S. Yokoyama, K. Kamikado, and S. Mashiko, STM Induced Photon Emission from Adsorbed Porphyrin Molecules on a Cu(100) Surface in Ultrahigh Vacuum, Surface Science,, 454, pp. 1021-1025 (2000).
153. S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, Control of Photonic Bandgaps in Chiral Liquid Crystals for Distributed Feedback Effect, Thin Solid Films, 499, pp. 322-328 (2006).
154. T. Kamikado, T. Sekiguchi, S. Yokoyama, Y. Wakayama, and S. Mashiko, Control of Single Supramolecular Chain of Porphyrin on a Copper Surface, Thin Solid Films, 499, pp. 329-332 (2006).


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