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Optical near-field excitation using liquid crystals on nanostruc- tured photoreactive molecular thin films

Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1351-1355页

作者： OHDAIRA Yasuo SHINBO Kazunari BABA Akira kato keizo KANEKO Futao Graduate School of Science and Technology Niigata University 2-8050 Ikarashi Nishi-ku Niigata City Niigata 950-2181 Japan Center for Transdisciplinary Research Niigata University 2-8050 Ikarashi Nishi-ku Niigata City Niigata 950-2181 Japan

Optical near-field excitations were investigated on the basis of molecular alignment control of liquid crystals (LCs) on an optically rewritable nanostructure of photoreactive molecular thin films. Twisted nematic (TN) cells of LC molecules were constructed utilizing ITO substrates with 260 nm gratings of an azobenzene molecular thin film, fabricated using standing evanescent waves. The polarization changes of light transmitted through the TN cells, which were due to the alignment changes of LC molecules locally rubbed by the azobenzene nanogratings, were observed. Furthermore, we demonstrated local plasmon excitation of Au nanowires deposited on the azobenzene nanogratings using oblique vacuum evaporation, a phenomenon that produced strong anti-optical absorption spectra. The modulation of the local plasmon resonance in metallic nanowires decorated with LC molecules was confirmed.

关键词： optical near-field azobenzene molecular thin film liquid crystal optical polarization local plasmon excitation

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Enhanced organic solar cell performance: Multiple surface plasmon resonance and incorporation of silver nanodisks into a grating‐structure electrode

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Opto-Electronic Advances 2019年第7期2卷 7-20页

作者： Thitirat Putnin Chutiparn Lertvachirapaiboon Ryousuke Ishikawa Kazunari Shinbo keizo kato Sanong Ekgasit Kontad Ounnunkad Akira Baba Graduate School of Science and Technology Niigata University 8050 Ikarashi-2-nocho Nishi-ku Niigata 950-2181 Japan Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC) Faculty of Science and Center of Excellence in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand Sensor Research Unit Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand

In this study, plasmonic nanostructures were examined to enhance the light harvesting of organic thin-film solar cells (OSCs) by multiple surface plasmon resonance (SPR) phenomena originating from the grating-coupled configuration with a Blu-ray Disc recordable (BD-R)-imprinted aluminum (Al) grating structure and the incorporation of a series of silver nanodisks (Ag NDs). The devices with such a configuration maximize the light utilization inside OSCs via light absorption, light scattering, and trapping via multiple surface plasmon resonances. Different types and sizes of metallic nanoparticles (NPs), i.e., gold nanoparticles (Au NPs), Ag nanospheres (Ag NSs), and Ag NDs, were used, which were blended separately in a PEDOT:PSS hole transport layer (HTL). The device structure comprised of grating- imprinted-Al/P3HT:PCBM/Ag ND:PEDOT:PSS/ITO. Results obtained from the J–V curves revealed that the power conversion efficiency (PCE) of grating-structured Al/P3HT:PCBM/PEDOT:PSS/ITO is 3.16%;this value is ~6% higher than that of a flat substrate. On the other hand, devices with flat Al and incorporated Au NPs, Ag NSs, or Ag NDs in the HTL exhibited PCEs ranging from 3.15% to 3.37%. Furthermore, OSCs with an Al grating substrate were developed by the incorporation of the Ag ND series into the PEDOT:PSS layer. Compared with that of a reference device, the PCEs of the devices increased to 3.32%–3.59%(11%–20% improvement), indicating that the light absorption enhancement at the active layer corresponds to the grating-coupled surface plasmon resonance and localized surface plasmon resonance excitations with strong near-field distributions penetrating into the active layer leading to higher efficiencies and subsequent better current generation.

关键词： grating-coupled surface plasmon resonance localized surface plasmon resonance Ag nanodisks organic solar cells imprinted grating

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Platelet count and sustained virological response in hepatitis C treatment

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World Journal of Hepatology 2013年第4期5卷 182-188页

作者： Tatsuo Kanda keizo kato Akihito Tsubota Nobuo Takada Takayoshi Nishino Shigeru Mikami Tatsuo Miyamura Daisuke Maruoka Shuang Wu Shingo Nakamoto Makoto Arai Keiichi Fujiwara Fumio Imazeki Osamu Yokosuka Department of Gastroenterology and Nephrology Graduate School of MedicineChiba UniversityChiba 260-8677Japan Department of Gastroenterology Narita Red Cross HospitalNarita 286-8523Japan Institute of Clinical Medicine and Research Jikei University School of MedicineKashiwa 277-8567Japan Department of Gastroenterology Toho University Sakura Medical CenterSakura 285-8741Japan Department of Gastroenterology Tokyo Women's Medical University Yachiyo Medical CenterYachiyo 276-8524Japan Department of Medicine Kikkoman HospitalNoda 270-0116Japan

AIM:To examine the epidemiological data,hematological safety and treatment responses of peginterferonalpha 2a plus ribavirin therapy for hepatitis ***:Between March 2008 and February 2011,196 hepatitis C virus(HCV)genotype 1 infected Japanese(127 treatment-naive and 69 treatment-experienced patients)patients treated with peginterferonalpha 2a plus ribavirin were *** examined the epidemiological data and treatment responses were retrospectively analyzed in terms of hematological *** RNA was measured by the COBAS TaqMan HCV ***:Overall sustained virological response(SVR)rates of treatment-naive and treatment-experienced patients were 56% and 39%,*** logistic regression analysis showed that SVR was attained independently of early virological response in both treatment-naive and treatment-experienced *** rates did not differ between the pretreatment hemoglobin < 13 g/dL and ≥ 13 g/dL ***,in treatment-naive patients,the SVR rate of the pretreatment platelet count < 130000/μL group was significantly lower than that of the pretreatment platelet count ≥ 130000/μL ***:Attention should be paid to potential thrombocytopenia in the treatment of chronic hepatitis C patients.

关键词： Anemia Antiviral treatment Chronic hepatitis C Platelet count Sustained virological response

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Magnetic-Field-Induced Phase Transition and a Possible Quantum Hall Effect in the Quasi-One-Dimensional CDW Organic Conductor HMTSF-TCNQ

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Journal of Modern Physics 2014年第8期5卷 673-679页

作者： keizo Murata Yuhei Fukumoto Keiichi Yokogawa Woun Kang Ryo Takaoka Ryota Tada Hikaru Hirayama James S. Brooks David Graf Harukazu Yoshino Takahiko Sasaki Reizo kato Department of Physics Ewha Womans University Seoul Korea Graduate School of Science Osaka City University Osaka Japan Institute for Materials Research Tohoku University Sendai Japan National High Magnetic Field Laboratory/Florida State University Tallahassee USA RIKEN Wako Saitama Japan

In the Temperature-Pressure phase diagram, the quasi-one-dimensional conductor, HMTSF-TCNQ, the ground state at ambient pressure is an insulator of charge density wave (CDW) below 30 K, while it shows a good metallic nature at higher temperature. The CDW insulating state is suppressed by a pressure of 1 GPa, which is considered to be a quantum critical point. Neither at 0 - 0.5 nor 2 GPa but only around this critical point in pressure, field-induced phases appear from 0.2 T through 10 T, where Rxy is almost constant and Rxx is very low. These phenomena are achieved when the magnetic field is applied along the least conducting axis. The behaviors are consistent with a kind of Quantum Hall Effect (QHE). The field-induce phase accompanied by the QHE might be the field-induced CDW (FICDW) similar to that of FISDW, observed in (TMTSF)2X salts. This paper presents the latest result of the Hall effects reviewing the history of the authors’ work on this material from preliminary to the latest ones.

关键词： Charge Density Wave Magnetoresistance Field-Induced CDW Fermi Surface Nesting Quantum Hall Effect

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