PUBLICATIONS

論文紹介

2007-present

  • 143
    Efficient four-wave mixing wavelength conversion in hybrid silicon and polymer microring resonator

    Jianxun Hong, Kenta Rokumyo, Jiawei Mao, Alisa Bannaron, Hiromu Sato, and Shiyoshi Yokoyama

    Optics Express (2022). DOI; 10.1364/OE.475748

  • 142
    Heterogeneous silicon-on-lithium niobate electro-optic modulator for 100-Gbaud modulation

    Jiawei Mao, Hiromu Sato, Guo-Wei Lu, and Shiyoshi Yokoyama

    APL Photonics (2022); DOI: 10.1063/5.0109251

  • 141
    Control of emission diffraction angles and laser threshold in mixed-order sampled distributed feedback laser with organic gain media

    HyunSuk Park, Sahar Alasvand Yazdani, Fatima Bencheikh, Ryutaro Komatsu, Shiyoshi Yokoyama, Takuro Kamiya, Chihaya Adachi

    J. Appl. Phys. (2022). DOI; 10.1063/5.0123476

  • 140
    Efficient silicon and side-cladding waveguide modulator with electro-optic polymer

    J. Mao, H. Sato, A. Bannaron, J. Hong, G. Lu, and S. Yokoyama

    Optics Express 30(2), 1885-1895 (2022). DOI: 10.1364/OE.447616

  • 139
    A 100 Gbaud On-off-Keying Silicon-Polymer Hybrid Modulator Operating at up to 110°C

    H. Sato, J. Mao, A. Bannaron, T. Kamiya, and S. Yokoyama

    IEEE Photonics Technology Letters,33(24). 1507-1510 (2021). DOI: 101.1109/LPT.2021.3126945

  • 138
    Power-efficient O-band 40 Gbit/s PAM4 transmission based on dual-drive cascaded carrier-depletion and carrier-injected silicon Mach-Zhender modulator with binary driving electronics at CMOS voltages

    G. W. Lu, H. Zhang, S. Shinada, J. Hong, Y. heng, and S. Yokoyama

    IEEE J. Selected Topics in Quantum Electronics 27, pp1-8 (2021) DOI: 10.1109/JSTQE.2021.3056721

  • 137
    Frequency correlated photon generation at telecom band using silicon nitride ringe cavitlies

    Z. Yin, S. Sugiura, H. Takashima, R. Okamoto, F. Qiu, S. Yokoyama and S. Takeuchi

    Optics Express 29 pp. 4821-4829 (2021). DOI 10.1364/OE.416165

  • 136
    High-temperature-resistant silicon-polymer hybrid modulator operating at up to 200 Gbits-1 for energy-efficient datacentres and hash-environment applications

    G. Lu, J. Hong, F. Qiu, A. M. Spring, T. Kashino, J. Oshima, M. Ozawa, H.i Nawata, and S. Yokoyama

    Nature Communications, 11, 4224 1-9 (2020). https://doi.org/10.1038/s41467-020-18005-7

  • 135
    A verified equivalent-circuit model for slot waveguide modulatorA

    H. Zwickel S. Singer, C. Kinneger, Y. Kutuvantavida, N. Muradyan, T. Wahlobrink, S. Yokoyama, S. Randel, W. Freude, and C. Koos

    Optics Express, 28, 129251-12978 (2020). Doi.org/10.1364/EO.383120

  • 134
    High efficient silicon nitride waveguide grating coupler with a multilayer bottom reflector

    J. Hong, A. M. Spring, F. Qiu, and S. Yokoyama

    Scientific Reports 9, 12988 (2019), https://doi.org/10.1038/s41598-019-49324-5

  • 133
    Adamantyl and carbazole containing trans-poly(norbornene-dicarboximide)s as electro-optic chromophore hosts

    A. M. Spring, F. Qiu, J. Hong, A. Bannaron, X. Cheng, and S. Yokoyama

    Polymer 172, 382-390 (2019). https://doi.org/10.1016/j.polymer.2019.04.015

  • 132
    Camera Sensor Platform for HIgh Speed Video Data Transmission Using a Wideband Electro-optic Polymer Modulator

    X. Cheng, F. Qiu, , A. M. Spring, M. Sasaki, T. Kashino, M. Ozawa, H.i Nawata, T. Kita, O. sugihara, and S. Yokoyama

    Optics Express 27, 1877-1883 (2019)

  • 131
    Demonstration of Long-term Thermally Stable Silicon-organic Hybrid Modualtor at 85°C

    C. Kieninger, Y. Kutuvantavida, H. Miura, J. N. Kemal, H. Zwickel, F. Qiu, M. Lauermann, W. Freude, S. Randel, S. Yokoyama, and C. Koos

    Optics Express 26, 27955-27964 (2018), https://doi.org/10.1364/OE.26.027955

  • 130
    Plate-slot Polymer Waveguide Modulaor on Silicon-on-insulator

    F. Qiu, A. M. Spring, J. hong, and S. Yokoyama

    Optics Express 26, 11213-11221 (2018). https://doi.org/10.1364/OE26.011213

  • 129
    A High Efficiency and Wide Bandwidth Segmented Silicon Grating Coupler

    J. Hong, F. Qiu, A. M. Spring, and S. Yokoyama

    Applied Optics 57, 3301-3305 (2018). https://doi.org/101364/AO.57.003301

  • 128
    High Thermal Stability 40 GHz Electro-optic Polymer Modulator

    H. Miura, F. Qiu, A. M. Spring, T. Kashino, T. Kikuchi, M. Ozawa, H. Nawata, K. Odoi, and S. Yokoyama

    Optics Express 25, 28643-28649 (2017)

  • 127
    Electro-optic Polymer Ring Resonator Modulator on a Flat Silicon-on-Insulator

    F. Qiu, A. M. Spring, J. hong, H. Miura, T. Kashino, T. Kikuchi, M. Ozawa, H. Nawata, K. Odoi, and S. Yokoyama

    Laser & Photonics Review 11, 1700061 1-6 (2017). https://doi.org/10.1002/lpor.201700061

  • 126
    Crosslinked Poly(norbornene-dicarboximide)s as Electro-optic Chromophore Hosts

    A. M. Spring, F. Qie, J. Hong, A. Bannaron, T. Kashino, T. Kikuchi, M. Ozawa, H. Nawata, K. Odoi, and S. yokoyama

    Europian Polymer Journal 97, 263-271 (2017). doi.org/10.1016/j.europolymj.2017.10.022

  • 125
    Fabrication of High-Q Factor RIng Resonator using LSCVD Deposited Si3N4 Film

    X. Cheng, J. Hong, A. M. Spring, and S. Yokoyama

    Optical Materilas Express 7, 2182-2187 (2017). https://doi.org/10.1364/OME.7.002182

  • 124
    A High-speed Electro-optic Triple-microring Resonator Modulator

    J. Hong, F. Qiu, X. Chang, A. M. Spring, and S. Yokoyama

    Scientific Reports 7, 4682 (2017) DOI:10.1038/s41598-017-04851-x

  • 123
    Electro-optic Properties of a Side Chain Poly(norbornenedicarboximide) System with an Appended Phenylvinylen Thiophase Chromophore

    A. M. Spring, F. Qiu, J. Hong, A. Bannaron, and S. Yokoyama

    Polymer 119, pp.13-17 (2017) http://dx.doi.org/10.1016/j.polymer.2017.05.005

  • 122
    A Low Driving Voltage Mach-Zehnder Interference Modulator Constructed from an Electro-optic Polymer on Ultra-thin Silicon with a Broadband Operation

    H. Sato, H. Miura, F. Qiu, A. M. Spring, T. Kasjino, T. Kikuchi, M. Ozawa, H. Nawata, K. Odoi, and S. Yokoyama

    Optics Express 25, 768-775 (2017) http://dx.doi.org/10.1364/OE.25.000768

  • 121
    An electro-optic polymer cladded TiO2 waveguide modulator

    F. Qiu, H. Miuro, A. M. Spring, J. Hong, D. Maeda, M. Ozawa, K. Odoi, and S. Yokoyama

    Appl. Phys. Lett. 109, 173301-1-4 (2016) http://dx.doi.org/10.1063/1.4966272

  • 120
    High stability poly(N-adamantyl-exo-norbornene-5,6-dicarboximide) and phenyl vinylene thiophene electro-optic host-guest system

    Andrew M. Spring, Feng Qiu, and Shiyoshi Yokoyama

    Europian Polymer Journal 84, pp.84-99 (2016)

  • 119
    Efficiently Poled Electro-optic Polymer Modulator

    F. Qiu and S. Yokoyama

    Optics Express 24, pp. 19020-19025 (2016). DOI: 10.1364/OE.24.019020

  • 118
    An Athermal Hybrid Silicon/Polymer Ring Resonator Electro-optic Modulator

    F. Qiu, A. M. Spring,H. Miura, D. Maeda, M. Ozawa, K. Odoi, and S. Yokoyama

    ACS Photonics, 3, pp. 780-783 (2016) DOI: 10.1021/acsphotonics.5b00695

  • 117
    Ultra-thin Silicon /Electro-optic Polymer Hybrid Waveguide Modulator

    F. Qiu, H. Sato, A. M. Spring, D. Maeda, M. Ozawa, K. Odoi, I. Aoki, A. Otomo, and S. Yokoyama

    Appl. Phys. Lett. 107, 123302-1-6 (2015) http://dx.doi.org/10.1063/1.4931490

  • 116
    An Athermal and High-Q Hybrid TiO2-Si3N4 Ring Reosonator via an Etching-free Fabrication Technique

    F. Qiu, A. M. Spring, and S. Yokoyama

    ACS Photonics, 2, pp. 405-409 (2015) DOI: 10.102/ph500450n

  • 115
    A Hybrid Electro-optic Polymer and TiO2 Double-slot Waveguide Modulator

    F. Qiu, A. M. Spring, D. Maeda, M. Ozawa, K. Odoi, I. Aoki, A. Otomo, and S. Yokoyama

    Scientific Reports, 5, pp. 85601-1-6 (2015) DOI; 10.1038/srep08561

  • 114
    Glass Transition Temperature Controlled by Poly(norbornene-dicarboximide) Copolymer.

    A. M. Spring, D. Maeda, M. Ozawa, K. Odoi, F. Qiu, K. Yamamoto, and S. Yokoyama

    Polymer Bullten 72, pp. 503-521 (2014) DOI: 10.1007/s00289-014-1283-2

  • 113
    An Analysis of theStructural, Thermal and Optical Characteristics as well as the Electrical Resistivity of tert-butyldiphenylsilyl Substituted Poly(norbornene-dicarboximide)s

    A. M. Spring, D. Maeda, M. Ozaki, K. Odoi, F. Qiu, K. Yamamoto, and S. Yokoyama

    Polymer, 56, pp. 189-198 (2014) DOI: 10.1016/j.polymer.2014.11.043

  • 112
    A Straightforward Electro-optic Polymer Covered Titanium Dioxide Strip Line Modulator with a Low Driving Voltage

    F. Qiu, A. M. Spring, D. Maeda, M. Ozawa, K. Odoi, I. Aoki, A. Otomo, and S. Yokoyama

    Appl. Phys. Lett., 105, pp. 073305-1-4 (2014).

  • 111
    TiO2 Ring-resonator-based EO Polymer Modulator

    F. Qiu, A. M. Spring, D. Maeda, M. Ozawa, K. Odoi, I. Aoki, A. Otomo, and S. Yokoyama

    Opics Express 22, pp. 14101-14107 (2014)

  • 110
    The Preparation of Well-controlled Poly(N-cyclohexyl-exo-norbornene-5,6-dicarboximide) Polymers

    A. M. Spring, F. Yu, F. Qiu,K. Yamamoto, and S. Yokoyama

    Polymer J. 46, pp. 576-583 (2014)

  • 109
    Electro-optic Properties of a Bi-chromophore Norbornene Polymer Brush System

    Y. Jia, A. M. Spring, F. Qiu, F. Yu, K. Yamamoto, I. Aoki, A. Otomo, and S. Yokoyama

    Jpn. J. Appl. Phys., 53, 01AF04 (2014).

  • 108
    Electro-Optic Polymer / Titanium Dioxide Hybrid Core Ring Resonator Modulators

    F. Qiu, A. M. Spring, F. Yu, I. Aoki, A. Otomo, and S. Yokoyama

    Laser Photonics Rev. 7, pp. L87-88 (2013).

  • 107
    A Norbornene Polymer Brush for Electro-Optic Applications

    J. Yue, A. M. Spring, F. Yu, K. Yamamoto, I. Aoki, A. Otomo, and S. Yokoyama

    Thin Solid Films, DOI 10.1016/j.tsf.2013.06.071 (2013)

  • 106
    Thin TiO2 Core and Electro-Optic Polymer Cladding Wavaguide Modulators

    F. Qiu, A. M. Spring, F. Yu, I. Aoki, A. Otomo, and S. Yokoyama

    Appl. Phys. Lett., 102, pp. 233504-1-3 (2013).

  • 105
    CMOS-compatible Athermal Silicon Nitride/Titaniumu Dioxide Hybrid Micro-ring Resonators

    F. Qiu, A. M. Spring, F. Yu, and S. Yokoyama

    Appl. Phys. Lett.,102, pp. 051106-1-3 (2013)

  • 104
    An Enhanced Host-guest Electro-Optical Polymer System using Poly(norbornene-dicarboximides) via ROMP

    F. Yu, A. M. Spring, L. Li, F. Qiu, K. Yamamoto, D. Maeda, M. Ozawa, K. Odoi, and S. Yokoyama

    J. Polym. Sci., Part A, 51, pp. 1278-1284 (2013)

  • 103
    Thermal-sensitive Wavelength Filter Based on Polymer Wavaguide and Polarization Mainitaining Fiber

    F. Qiu, F. Yu, A. M. Spring, and S. Yokoyama

    J. Opt. Soc. Am. B, 29, pp. 3069-3071 (2012).

  • 102
    An Athermal Silicon Nitride Ring Resonator by Photobreaching DR1/PMMA Polymer

    F. Qiu, F. Yu, A. M. Spring, and S. Yokoyama

    Opt. Lett.,37, pp. 4086-4088 (2012).

  • 101
    Large Electro-optic Activity and Enhanced Temporal Stability of Methacrylate-based Crosslinking Hyperbranched Nonlinear Optical Polymer

    Y. Mori, K. Nakaya, X. Piao, K. Yamamoto, A. Otomo, and S. Yokoyama

    J. Polym. Sci., Part A, 50, pp. 1254-1260 (2012).

  • 100
    Nonlinear Behavior of Photoluminescence from Silicon Particles under Two-photon Exitation

    X. Xu and S. Yokoyama

    Appl. Phys. Lett., 99, pp. 251105-1-3 (2011).

  • 99
    Enhancement of Electro-optic Activity by a Simple Donor Strengthening Approach

    X. Piao, X. Zhang, S. Inoue, H. Miki, I. Aoki, A. Otomo, and S. Yokoyama

    Organic Electronics, 12, pp. 1093-1097 (2011).

  • 98
    Nonlinear Optical Side-chain Polymers Postfunctionalized with High-beta Chromophores Exhibiting Large Electro-optic Property

    X. Piao, Z. Zhang, Y. Mori, M. Koishi, A. Nakaya, S. Inoue, I. Aoki, A. Otomo, and S. Yokoyama

    J. Polym. Sci. Part A,49, pp. 47-54 (2011).

  • 97
    Effect of Modified Donor Units on Molecular Hyperpolarizability of Thienyl-Vinylene Nonlinear Optical Chromophores

    X. Zhang, I. Aoki, X. Piao, S. Inoue, H. Tazawa, S. Yokoyama, and A. Otomo

    Tetrahedron Lett., 51, pp. 5873-5876 (2010).

  • 96
    Modification of Two-photon Excited Fluorescence from Quantum Dots on SiN Photonic Crystal

    X. Xu, T. Yamada, and S. Yokoyama

    Opt. Lett., 35, 309-311 (2010).

  • 95
    Enhanced Electro-optic Response of a Poled Polymer in a Reflection-type Microcavity

    A. Inoue, S. Inoue, and S. Yokoyama

    Opt. Comm. 283, 2935-2938 (2010).

  • 94
    Polymer Micro-structure Embedded in Two-Dimensional Photonic Crystals

    K. Sasaki, S. Inoue, K. Nishio, H. Masuda, A. Otomo, and S. Yokoyama

    Opt. Mater., 32, pp. 543-546 (2010).

  • 93
    Correlation between Antibunching and Blinking of Photoluminescence from a CdSe/ZnS Quantum Dot

    X. Xu, T. Yamada, and S. Yokoyama

    Eur. Phys. J. D, 55, 691-697 (2009).

  • 92
    Numerical Simulation of an Ultra-compact Electro-optic Modulator Based on Nanoscale Plasmon Metal Gap Waveguides

    S. Inoue and S. Yokoyama

    Elec. Lett. 45, pp. 1087-1088 (2009).

  • 91
    Nonlinear Optical Responses in Two-Dimensional Photonic Crystals

    S. Inoue and S. Yokoyama

    Thin Solid Films, 518, pp. 470-472 (2009).

  • 90
    Synthesis and Characterization of Binary Chromophore Polymers for Eelectro-optic Application

    X. Piao, S. Inoue, S. Yokoyama, H. Miki, I.. Aoki, A. Otomo, H. Tazawa

    Thin Solid Films, 518, pp. 481-484 (2009).

  • 89
    Enhancement of Two-photon Excited Fluorescence in Two-dimensional Nnonlinear Ooptical Ppolymer Photonic Ccrystal Wwaveguide

    S. Inoue and S. Yokoyama

    Appl. Phys. Lett., 93, pp. 111110-3 (2008).

  • 88
    Direct Determination of Pphotonic Band Structure for Waveguiding Mmodes in Two-dimensional Pphotonic Crystals

    S. Inoue, S. Yokoyama, and Y. Aoyagi

    Opt. Exp., 16, pp. 2461-2468 (2008).

  • 87
    The Fluorescence Behavior from SAM of Dendron with Rhodamine B as a Center

    Y. Naitoh, A. Otomo, H. Miki, I. Aoki, and S. Yokoyama

    Thin Solid Films, 516, pp. 2371-2375 (2008).

  • 86
    Nanosecond and Femtosecond Mass Spectroscopic Analysis of a Molecular Beam Produced by the Spray-jet Technique

    T. Yamada, H. Shinohara, T. Kamikado, Y. Okuno, H. Suzuki, S. Mashiko, and S.Yokoyama

    Thin Solid Films, 516, pp. 2522-2526 (2008).

  • 85
    Theoretical Study of Molecular Rectificafion in Porphyrin Dimer

    Y. Okuno and S. Yokoyama

    Thin Solid Films, 516, pp. 2630-2634 (2008).

  • 84
    Observation of Negative Differential Resistance and Single-electron Tunneling in Electromigrated Break Junctions

    Y. Noguchi, R. Ueda, T. Kubota, T. Kamikado, S. Yokoyama, and T. Nagase

    Thin Solid Films, 516, pp. 2762-2766 (2008).

  • 83
    Superfocusing Modes of Surface Plasmon Polaritons in Conical Geometry Based on the Quasi-separation of Variables Approach

    K. Kurihara, A. Otomo, A. Syouji, J. Takahara, K. Suzuki, and S. Yokoyama

    J. Phy. A, MAT. THEO., 40, pp. 12479-12503 (2007)

  • 82
    Analysis of a Molecular Beam Produced by the Spray-jet Technique with Femtosecond Laser Mass Spectroscopy

    T. Yamada, H. Shinohara, S. Mashiko, and S. Yokoyama

    Mol. Crys. Liq. Crys., 472, pp. 561-569 (2007)

  • 81
    Single-mode Polymer DBR Lasers with Two-dimensional Microcavity Structures

    S. Yokoyama

    IEICE TRANS. ELECT., E 90C, pp. 135-138 (2007)

  • 80
    Interstitial Accommodation of C-60 in a Surface-supported Supramolecular Network

    F. Nishiyama, T. Yokoyama, T. Kamikado, S. Yokoyama, S. Mashiko, K. Sakaguchi, K. Kikuchi

    Adv. Mater., 19, pp. 117-120 (2007).

Before 2006

Polymer Photonics, Polymer Laser, and Polymer Sub-micro Scale Fabrication

  • 79
    Lasing from Two-dimensional Photonic Crystals Using Anodic Porous Alumina

    H. Masuda, M. Yamada, F. Matsumoto, S. Yokoyama, S. Mashiko, M. Nakao, and K. Nishio

    Adv. Mater., 18, pp. 213-126 (2006).

  • 78
    Laser Emission from Three-dimensional Photonic Crystal of Blue-phase Liquid Crystal and Polymer Composite

    S. Yokoyama, S. Mashiko, H. Kikuchi, K. Uchida, and T. Nagamura

    Adv. Mater., 18, pp. 48-51 (2006).

  • 77
    Control of Multiphoton Process within Diffraction Limit Space in Polymer Microstructures

    T. Nakahama, S. Yokoyama, H. Miki, and S. Mashiko

    Thin Solid Films, 499, pp. 406-409 (2006).

  • 76
    Synthesis and Luminescence Properties of Benzylthioether Dendrons Bearing Rhodamine B at the Focal Point

    H. Miki, A. Otomo, S. Yokoyama, and S. Mashiko

    Thin Solid Films, 499, pp. 333-337 (2006).

  • 75
    Photonic Crystal Templates for Organic Solid-state Laser

    S. Yokoyama, T. Nakahama, S. Mashiko, M. Nakao, M. Yamada, K. Nishio, and H. Masuda

    Appl. Phys. Lett., 87, pp. 191101 1-3 (2005).

  • 74
    Amplified Spontaneous Emission and Laser Emission from a High Optical-gain medium of Dye-doped Dendrimer

    S. Yokoyama, T. Nakahama, and S. Mashiko

    J. Luminescence, 111, pp. 285-290 (2005). (Invited)

  • 73
    Phototunable Photonic Band-gap in a Chiral Liquid Crystal Laser Device

    S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko

    Appl. Phys. Lett., 84, pp.2491-2493 (2004).

  • 72
    Two-photon-induced Polymerization in a Laser Gain Medium for Optical Microstructure

    S. Yokoyama, T. Nakahama, H. Miki, and S. Mashiko

    Appl. Phys. Lett., 82, pp. 3221-3223 (2003).

  • 71
    Tuning of Laser Frequency in Random Media of Dye-doped Polymer and Glass Particle Hybrid

    S. Yokoyama and S. Mahsiko

    Jpn. J. Appl. Phys., 42, pp. L970-973 (2003).

  • 70
    Fabrication of Three-dimensional Microstructure in an Optical Gain Medium Using Two-photon-induced Photopolymerization Technique

    S. Yokoyama, T. Nakahama, H. Miki, and S. Mashiko

    Thin Solid Films, 438, pp. 452-456 (2003).

  • 69
    Electrical Control of the Structure and Lasing in Chiral Photonic Band-gap Liquid Crystals

    S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko

    Appl. Phys. Lett., 82, pp. 16-18 (2003).

  • 68
    Effective Photocrosslinking Reaction of Dendrimers through Triplet Energy Transfer

    S. Furumi, A. Otomo, S. Yokoyama, and S. Mashiko

    Thin Solid Films, 438, pp. 85-89 (2003)

  • 67
    Study on Laser Action from UV-curable Chiral Nematic Liquid Crystals

    S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko

    Thin Sold Films, 438, pp. 423-427 (2003).

  • 66
    Laser Emission from High-gain media of Dye-doped Dendrimer

    S. Yokoyama, A. Otomo, and S. Mashiko

    Appl. Phys. Lett., 80, pp. 7-9 (2002).

  • 65
    Suprafluorescence Action from Rhodamine-cored Dendrimer

    S. Yokoyama, T. Nakahama, A. Otomo, and S. Mashiko

    Coll. Surf. A, 198, pp. 433-438 (2002).

  • 64
    Photochemical Stability of Encapsulated Laser Dyes in Dendritic Nanoboxes Against Singlet Oxygen

    A. Otomo, S. Otomo, S. Yokoyama, and S. Mashiko

    Opt. Lett., 27, pp. 891-893 (2002).

  • 63
    Estimation of Organic-molecular Film Structure using Surface-plasmon Resonance Spectroscopy

    M. Zhou, A. Otomo, S. Yokoyama, and S. Mashiko

    Thin Sold Films, 393, pp. 114-118 (2001).

  • 62
    Spatial Photon Confinement and Supper-radiation from Dye Cored Dendrimer

    S. Yokoyama and S. Mashiko

    Thin Solid Films, 393, pp. 124-128 (2001).

Dendrimer for Optoelectronic Applications

  • 61
    Interaction between Monomeric Units of Donor-Acceptor Functionalized Azobenzene Dendrimers: Effects on Macroscopic Configuration and First Hyperpolarizability

    Y. Okuno, S. Yokoyama, and S. Mashiko

    J. Phys. Chem. B, 105, pp. 2163-2169 (2001).

  • 60
    Intermolecular Coupling Enhancement of the Molecular Hyperpolarizability in Multi-choromophoric Dipolar Dendrons

    S. Yokoyama, T. Nakahama, A. Otomo, and S. Mashiko

    J. Am. Chem. Soc., 122, pp. 3174-3181 (2000).

  • 59
    Intermolecular Coupling Enhancement of the Molecular Hyperpolarizability in NLO Dendrimers

    S. Yokoyama and S. Mashiko

    Nonlinear Optics, 24, pp. 47-50 (2000).

  • 58
    Computational and Experimental Studies of Azobenzene Dendrons for Nonlinear Optical Applications

    S. Yokoyama, S. Mashiko, Y. Yamaguchi, and Y. Yokomichi

    Polym. Adv. Tech., 11, pp. 692-697 (2000).

  • 57
    Super-narrowing Mirrorless Laser Emission in Dendrimer-doped Polymer Waveguide

    A. Otomo, S. Yokoyama, T. Nakahama, and S. Mashiko

    Appl. Phys. Lett., 77, pp. 3881-3883 (2000).

  • 56
    Ab. Initio Calculations of First Hyperpolarizability for Donor-Acceptor Azobenzene and their Dimers

    Y. Okuno, S. Yokoyama, and S. Mashiko

    Nonlinear Optics, 26, pp. 83-90 (2000).

  • 55
    Molecular Design of Novel Azobenzene Dendrimers

    Y. Yamaguchi, Y. Yokomichi, S. Yokoyama, and S. Mashiko

    Polym. Adv. Tech., 674, 11, pp. 674-684 (2000).

  • 54
    Second Harmonic Generation of Dipolar Dendrons in the Assembled Thin Films

    S. Yokoyama, T. Nakahama, A. Otomo, and S. Mashiko

    Thin Solid Films, 331, pp. 248-253 (1998).

  • 53
    Preparation and Assembled Structure of Dipolr Dendrons Based Electron Donor/Acceptor Azobenzene Branching

    S. Yokoyama, T. Nakahama, A. Otomo, and S. Mashiko

    Chem. Lett., pp. 1137-1138 (1997).

  • 52
    Functional Dendritic Macromolecules: Preparation and Optical Properties

    S. Yokoyama, T. Nakahama, and S. Mashiko

    Mol. Cryst. Liq. Cryst., 294, pp. 19-22 (1997).

Molecular Assemblies and STM Surface Study

  • 51
    Layer-by-Layer Growth of Porphyrin Supermolecular Thin Films

    F. Nishiyama, T. Yokoyama, T. Kamikado, S. Yokoyama, and S. Mashiko

    Appl. Phys. Lett., 88, pp. 253113 1-3 (2006).

  • 50
    Nanoscale Organic Electroluminescence from Tunnel Junctions

    X. -L. Guo, Z. ?C. Dong, A. S. Trifonov, K. Miki, Y. Wakayama, K. Kimura, S.Yokoyama, and S. Mashiko

    Phys. Rev. B, 70, pp. 2332041-4 (2004).

  • 49
    Conformation Selective Assembly of Carboxyphenyl Substituted Porphyrins on Au (111)

    T. Yokoyama, T. Kamikado, S. Yokoyama, and S. Mashiko

    J. Chem. Phys., 121, pp. 11993-11997 (2004).

  • 48
    Adsorption-induced Conformation Changes of Phorphyrin Derivatives and Formation of Twin Superstructures on a Copper Surface

    T. Sekiguchi, Y. Wakayama, S. Yokoyama, T. Kamikado, and S. Mashiko

    Thin Solid Films, 464, pp. 393-397 (2004).

  • 47
    Vibrationally Resolved Fluorescence from Organic Molecules Near Metal Surface in a Scanning Tunneling Microscope

    Z. -C. Dong, X. -L. Guo, A. S. Trifonov, P. S. Dorozhkin, K. Miki, K. Kimura, S. Yokoyama, and S. Mashiko

    Phys. Rev. Let., 92, pp. 86801-4 (2004).

  • 46
    Tunneling-electron-induced Molecular Luminescence from a Nanoscale Layer of Organic Molecules on Metal Substrates

    X. -L. Guo, Z. -C. Dong, A. S. Trifonov, S. Yokoyama, S. Mahsiko, and T. Okamoto

    Appl. Phys. Lett., 84, pp. 969-971 (2004).

  • 45
    Segregation of Molecular Overlayers with Different Structures on a Metal Surface

    H. Suzuki, H. Miki, S. Yokoyama, and S. Mashiko

    Thin Solid Films, 437, pp. 97-100 (2003).

  • 44
    Determining the Conformation of a Phenyene-linked porphyrin Dimer by NMR Spectroscopy and Quantum Chemical Calculations

    Y. Okuno, T. Kamikado, S. Yokoyama, S. Mashiko

    J. Mol. Structure-Theochem, 631, pp. 13-20 (2003).

  • 43
    Molecule Isomers by Using a Scanning Tunneling Microscope

    H. Suzuki, H. Miki, S. Yokoyama, and S. Mashiko

    J. Phys. Chem. B, 107, pp. 3659-3662 (2003).

  • 42
    Tunneling Electron Induced Luminescence from Monolayered Cu-TBP Porphyrin molecules adsorbed on Cu (100)

    Z. -C. Dong, A. Kar, R. Dorozhkin, K. Amemiya, T. Uchihashi, S. Yokoyama, K. Kamikado, S. Mashiko, and T. Okamoto

    Thin Solid Films, 438, pp. 262-267 (2003).

  • 41
    Light Emission from Organic Molecules on Metal Substrate Induced by Tunneling

    X. -L. Guo, Z. ?C. Dong, A. Trifonov, S. Yokoyama, S. Mashiko, and T. Okamoto

    Jpn, J. Appl. Phys., 42, pp. 6937-6940 (2003).

  • 40
    Tunneling Electron Induced Photon Emission from Monolayered H2TBPP porphyrin on Cu (100)

    Z. -C. Dong, A. Trifonov, X. ?L. Guo K. Amemiya, S. Yokoyama, T. Kamikado, T. Yamada, S. Mashiko, and T. Okamoto

    Surface Science, 532, pp. 237-243 (2003).

  • 39
    Novel Rigid-rod 2,6-Diphenylbenzo[1,2-d:4,5-d’]bisthiazole (DPBBT) Derivatives for Second-order Nonlinear Optical Chromophores

    S. -H. Lee, A. Otomo, T. Nakahama, T. Yamada, T. Kamikado, S. Yokoyama, and S. Mashiko

    J. Mater. Chem., 12, pp. 2187-2188 (2002).

  • 38
    Theoretical Study of Aryl-ring Rotation in Arylphorphyrins

    Y. Okuno, T. Kamikado, S. Yokoyama, and S. Mashiko

    J. Mol. Structure-Theochem., 594, pp. 55-60 (2002).

  • 37
    Light Emission from Porphyrin Molecules Induced by a Scannin Tunneling Microspce

    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

    Jpn. J. Appl. Phys., 41, pp. 4898-4902 (2002).

  • 36
    Molecularly Resolved Dynamics for Two-dimensional Nucleation of Supramolecular Assembly

    H. Yanagi, H. Mukai, K. Ikuta, T. Shibutani, T. Kamikado, S. Yokoyama, and S. Mashiko

    Nano Lett., 2, pp. 601-604 (2002).

  • 35
    STM Induced Photon Emission from Adsorbed Porphyrin Molecules on a Cu(100) Surface in Ultrahigh Vacuum

    D. Fujita, T. Ohgi, W. Deng, H. Nejo, T. Okamoto, S. Yokoyama, and S. Mashiko

    Surface Science, 454, pp. 1021-25 (2002).

  • 34
    Theoretical Study of Benzonitrile Clusters in the Gas Phase and Adsorption onto a Au(111)-surface

    Y. Okuno, T. Yokoyama, S. Yokoyama, T. Kamikado, and S. Mashiko

    J. Am. Chem. Soc., 124, pp. 7218-7225 (2002).

  • 33
    STM-induced Photon Emission from Self-assembled Porphyrin Molecules on a Cu (100) surface

    W. Deng, D. Fujita, T. Ohgi, S. Yokoyama, K. Kamikado, and S. Mashiko

    J. Chem. Phys., 117, pp. 4995-5000 (2002).

  • 32
    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

    Y. Yamaguchi, S. Yokoyama, and S. Mashiko

    J. Chem. Phys., 116, pp. 6541-6548 (2002).

  • 31
    Theoretical Prediction of First-order Hyperpolarizabilities of Azobenzene Dendrimers,

    Y. Yamaguchi, Y. Yokomichi, S. Yokoyama, and S. Mashiko

    J. Mol. Structure-Theochem., 545, pp. 187-196 (2001).

  • 30
    Time-dependent Density Functional Calculations of the Q-like Bands of Phenylene-linked Free-base and Zinc Porphyrin Dimers

    Y. Yamaguchi, Y. Yokomichi, S. Yokoyama, and S. Mashiko

    Int. J. Quantum Chem., 84, pp. 338-347 (2001).

  • 29
    Nonplanar Adsorption and Orientational Ordering of Porphyrin Molecules on Au (111)

    T. Yokoyama, S. Yokoyama, T. Kamikado, and S. Mashiko

    J. Chem. Phys., 115, pp. 3814-3818 (2001).

  • 28
    Effect of the Metal/organic Interface Phenomena on the Current-voltage Characteristics of Organic Single Electron Tunneling Device,

    T. Kubota, S. Yokoyama, T. Nakahama, S. Mashiko, Y. Noguchi, Y. Majima, and M. Iwamoto

    Thin Solid Films, 393, pp. 379-382 (2001).

  • 27
    Photon Emission Induced by Tunneling Electrons from a Cu(100) Surface Covered with Porphyrin Molecules

    D. Fujita, T. Ohgi, W. Deng, K. Ishige, T. Okamoto, S. Yokoyama, and S. Mashiko

    Surface Science, 193, pp. 702-707 (2001).

  • 26
    Selective Assembly on a Surface of Supramolecular Aggregates with Controlled Size and Shape

    T. Yokoyama, S. Yokoyama, T. Kamikado, Y. Okuno, and S. Mashiko

    Nature, 413, pp. 619-621 (2001).

  • 25
    A Reaction-path Hamiltonian Described with Quasirectilinear Vibrational Coordinates Constructed from a Nonlinear Combination of Curvilinear Internal Coordinates: Application to Examination of the Reaction CH4+F->CH3+HF

    Y. Okuno, S. Yokoyama, and S. Mashiko

    J. Chem. Phys., 113, pp. 3136-3140 (2000).

  • 24
    STM Induced Photon Emission from Adsorbed Porphyrin Molecules on a Cu(100) Surface in Ultrahigh Vacuum

    D. Fujita, T. Ohgi, W. -L. Deng, H. Hejo, T. Okamoto, S. Yokoyama, K. Kamikado, and S. Mashiko

    Surface Science, 454, pp. 1021-1025 (2000).

Polymer Thin Films, Structure, and Optical Properties

  • 23
    The Preparation, Orientation and Electronic Structure of Poly(p-phenylenevinylene) (PPV) Monolayers on Silicon Surfaces

    M. Keil, A. Rajagopal, S. Yokoyama, H. Sotobayashi, A. M. Bradshaw, M. Kakimoto, and Y. Imai

    Zeitschirift fur Physikalische Chemie, Bd., 202, S.pp. 87-102 (1997).

  • 22
    Surface Observation of Langmuir-Blodgett Films of Polyamic Acid Alkylamine Salts and Polyimide by Atomic Force Microscopy and Friction Force Microscopy

    S. Yokoyama, M. Kakimoto, and Y. Imai

    Synthetic Metals, 81, pp. 265-270 (1996).

  • 21
    STM Studies of Polyimide Monolayers on Gold{111} Surfaces

    S. Yokoyama, M. Keil, H. Sotobayashi, A. M. Bradshaw, M. Kakimoto, Y. Imai, C. L. L. Lamont

    Zeischift fur Physikalische Chemie, Bd., 196, S. pp. 43-54 (1996).

  • 20
    The Structure of PMDA-PDA Polyimide Monolayers adsorbed on Gold Surfaces

    M. Keil, J. J. Paggel, Th. Schedel-Niedrig, S. Yokoyama, H. Sotobayashi, and A. M. Bradshaw

    Applied Surface Science, 90, pp. 377-381 (1995).

  • 19
    Absolute Orientation of Pendant Chromophores Attached to the Polymer Backbone in Monolayers at Interfaces Studied by Phase Measurement of Second Harmonic Generation

    K. Kajikawa, T. Yamada, S. Yokoyama, S Okuda, H. Matsuda, H. Nakanishi, M. Kakimoto, Y. Imai, H. Takezoe, and A. Fukuda

    Langmuir, 12, pp. 580-583 (1996).

  • 18
    Surface Structure and Orientation of Polyamic Acid Alkylamine Salt Langmuir-Blodgett Films Having an Azobenzene Pendant Unit

    S. Yokoyama, M. Kakimoto, Y. Imai, T. Yamada, K. Kajikawa, H. Takezoe, and A. Fukuda

    Thin Solid Films, 273, pp. 254-257 (1996).

  • 17
    Azimuthal Ohotoregulation of a Liquid Crystal with an Azobenzene-Modified Polyimide Langmuir-Blodgett Monolayer

    H. Akiyama, K. Kudo, K. Ichimura, S. Yokoyama, M. Kakimoto, and Y. Imai

    Langmuir, 11, pp. 1033-1037 (1995).

  • 16
    Surface Observation of Phase separated Polymeric LB films Using Scanning Probe Microscopy

    T. Yuba, S. Yokoyama, M. Kakimoto, and Y. Imai

    J. Photopolymer Sci. Tech., 7, pp. 281-284 (1994).

  • 15
    Further Investigation of the Preparation Process of Poy(p-phenylenevinilene) Langmuir-Blodgett Films

    A. Wu, S. Yokoyama, S. Watanabe, M. Kakimoto, Y. Imai, T. Araki, and K. Iriyama

    Thin Solid Films, 244, pp. 750-753 (1994).

  • 14
    Novel Orientation of Azobenzene Pendant Group in Hybrid Monolayer Composed of Polyimide LB Film and Alkyl Polysiloxane Self-Assembled Monolayer

    S. Yokoyama, T. Yamada, K. Kajikawa, M. Kakimoto, Y. Imai, H. Takezoe, and A. Fukuda

    Langmuir, 10, pp. 4599-4605 (1994).

  • 13
    Photochemically Inducible and Erasable Dichroism by Molecular Reorientation of Azobenzene Pendant Unit in Polyimide Langmuir-Blodgett Film

    S. Yokoyama, M. Kakimoto, and Y. Imai

    Langmuir, 10, pp. 4594-4605 (1994).

  • 12
    Imidization Process in a Dye-Labeled Polyamic Acid Langmuir-Blodgett Film Studied by Optical Second-Harmonic Generation

    T. Yamada, S. Yokoyama, K. Kajikawa, K. Ishikawa, H. Takezoe, A. Fukuda, and Y. Imai

    Langmuir, 10, pp. 1160-1163 (1994).

  • 11
    Displacement Current Generation Across Single Monolayers of Polyamic Acids Having Pendant Groups at the Air-Water Interface

    H. Naruse, M. Iwamoto, S. Yokoyama, M. Kakimoto, and Y, Imai

    Thin Sold Films, 24, pp. 220-222 (1994).

  • 10
    Various Orientations of Pendant Dye Attached to Polyamic Acid L and LB Films Studied by Optical Second-Harmonic Generation Interferometry Technique

    T. Tamada, S. Yokoyama, K. Kajikawa, K. Ishikawa, H. Takezoe, A. Fukuda, M. Kakimoto, and Y. Imai

    Thin Sold Films, 244, 754-757 (1994).

  • 9
    Photochemical Memory in Polyimide Langmuir-Blodgett Film with Azobenzene Pendant Group

    S. Yokoyama, M. Kakimoto, and Y. Imai

    Thin Sold Films, 242, pp. 183-186 (1994).

  • 8
    Photochemically Inducible and Erasable Photomemory in the Polyimide LB Films Possessing Azobenzene Pendant Unit

    S. Yokoyama, M. Kakimoto, and Y. Imai

    J. Photopolymer Sci. Tech., 6, pp. 291-294 (1993).

  • 7
    L Film of Dye-Attached Polyamic Acid and the Imidization Process of its LB Film Studied by Second-Harmonic Generation

    T. Yamada, S. Yokoyama, K. Kajikawa, K. Ishikawa, H. Takezoe, A. Fukuda, M. Kakimoto, and Y. Imai

    J. Photopolymer Sci. Tech., 6, pp. 197-200 (1993).

  • 6
    Preparation and In-Plane Anisotropic Photobleaching Properties of Polyimide Langmuir-Blodgett Film Having a Photoresponsive p-Nitrobenzene Pendant Group

    S. Yokoyama, M. Kakimoto, Y. Imai

    Langmuir, 9, pp. 1086-1091(1993).

  • 5
    New Memory System Constructed with Polyimide LB Films Having Azobenzene Pendant Groups: Behavior of In-Plane Anisotropic Photoisomerization, Photoinduced Optical Anisotropy, and Anisotropic Photofading

    S. Yokoyama, M. Kakimoto, and Y. Imai

    Mol. Cryst. Liq. Cryst., 227, pp. 295-307 (1993).

  • 4
    Synthesis of Ultra-Thin Films of Poly(vinylenebenzothiazole) at Air/Water Interface

    S. Yokoyama, A. Yoshida, T. Ueda, M. Watanabe, K. Sanui, and N. Ogata

    Chem. Lett., pp. 779-782 (1990).

  • 3
    Synthesis of Ultra-Thin Films of Polybenzoxazole and Their Electrical Properties

    S. Yokoyama, T. Ueda, M. Watanabe, K. Sanui, and N. Ogata

    New Polymeric Mater., 2, pp. 67-74, (1990).

  • 2
    Synthesis of Ultra-Thin Films of Aromatic Polymers at Air/Water Interface

    T. Ueda, S Yokoyama, M. Watanabe, K. Sanui, and N. Ogata,

    J. Polym. Sci. A, 28, pp. 3221-3230 (1990).