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Koichi Okamoto
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Journal Articles

Enhancement of the bandgap emission from GaN epilayer by surface plasmon resonance in the quadrupole oscillation mode using Ag nanoparticles protected by an oxide thin film

Seiya Kaito, Tetsuya Matsuyama, Kenji Wada, Mitsuru Funato, Yoichi Kawakami, Koichi Okamoto
Journal: Applied Physics Letters
Appl. Phys. Lett. 122, 151110 (2023)
https://doi.org/10.1063/5.0143725
Published: April 2023
View article titled, Enhancement of the bandgap emission from GaN epilayer by surface plasmon resonance in the quadrupole oscillation mode using Ag nanoparticles protected by an oxide thin film
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Includes: Supplementary data
Journal Articles

Erratum: “Morphological and optical properties of α - and β -phase zinc (II) phthalocyanine thin films for application to organic photovoltaic cells” [J. Chem. Phys. 153, 144704 (2020)]

Masahiro Kato, Masato Nakaya, Yuki Matoba, Shinta Watanabe, Koichi Okamoto, Jean-Pierre Bucher, Jun Onoe
Journal: The Journal of Chemical Physics
J. Chem. Phys. 155, 149901 (2021)
https://doi.org/10.1063/5.0071182
Published: October 2021
View article titled, Erratum: “Morphological and optical properties of α - and β -phase zinc (II) phthalocyanine thin films for application to organic photovoltaic cells” [J. Chem. Phys. 153, 144704 (2020)]
Open the PDF for Erratum: “Morphological and optical properties of α - and β -phase zinc (II) phthalocyanine thin films for application to organic photovoltaic cells” [J. Chem. Phys. 153, 144704 (2020)] in another window
Journal Articles

Erratum: “Photopolymerization effects on the external quantum efficiency of fullerene/zinc phthalocyanine heterojunction solar cells” [AIP Adv. 11, 075227 (2021)]

Masahiro Kato, Masato Nakaya, Shinta Watanabe, Koichi Okamoto, Jun Onoe
Journal: AIP Advances
AIP Advances 11, 109901 (2021)
https://doi.org/10.1063/5.0071181
Published: October 2021
View article titled, Erratum: “Photopolymerization effects on the external quantum efficiency of fullerene/zinc phthalocyanine heterojunction solar cells” [AIP Adv. 11, 075227 (2021)]
Open the PDF for Erratum: “Photopolymerization effects on the external quantum efficiency of fullerene/zinc phthalocyanine heterojunction solar cells” [AIP Adv. 11, 075227 (2021)] in another window
Journal Articles

Photopolymerization effects on the external quantum efficiency of fullerene/zinc phthalocyanine heterojunction solar cells

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Masahiro Kato, Masato Nakaya, Shinta Watanabe, Koichi Okamoto, Jun Onoe
Journal: AIP Advances
AIP Advances 11, 075227 (2021)
https://doi.org/10.1063/5.0052714
Published: July 2021
View article titled, Photopolymerization effects on the external quantum efficiency of fullerene/zinc phthalocyanine heterojunction solar cells
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Includes: Supplementary data
Journal Articles

Morphological and optical properties of α - and β -phase zinc ( ∥ ) phthalocyanine thin films for application to organic photovoltaic cells

Masahiro Kato, Masato Nakaya, Yuki Matoba, Shinta Watanabe, Koichi Okamoto, Jean-Pierre Bucher, Jun Onoe
Journal: The Journal of Chemical Physics
J. Chem. Phys. 153, 144704 (2020)
https://doi.org/10.1063/5.0022262
Published: October 2020
View article titled, Morphological and optical properties of α - and β -phase zinc ( ∥ ) phthalocyanine thin films for application to organic photovoltaic cells
Open the PDF for Morphological and optical properties of α - and β -phase zinc ( ∥ ) phthalocyanine thin films for application to organic photovoltaic cells in another window
Journal Articles

Finite-difference time-domain simulations of inverted cone-shaped plasmonic nanopore structures

Rintaro Matsuda, Sou Ryuzaki, Koichi Okamoto, Yusuke Arima, Makusu Tsutsui, Masateru Taniguchi, Kaoru Tamada
Journal: Journal of Applied Physics
J. Appl. Phys. 127, 243109 (2020)
https://doi.org/10.1063/5.0010418
Published: June 2020
View article titled, Finite-difference time-domain simulations of inverted cone-shaped plasmonic nanopore structures
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Includes: Supplementary data
Journal Articles

Comparison of the mechanical strength of a monolayer of silver nanoparticles both in the freestanding state and on a soft substrate

Pangpang Wang, Sou Ryuzaki, Lumei Gao, Shuhei Shinohara, Noboru Saito, Koichi Okamoto, Kaoru Tamada, Sunao Yamada
Journal: Journal of Applied Physics
J. Appl. Phys. 125, 134301 (2019)
https://doi.org/10.1063/1.5063567
Published: April 2019
View article titled, Comparison of the mechanical strength of a monolayer of silver nanoparticles both in the freestanding state and on a soft substrate
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Includes: Supplementary data
Journal Articles

Comparison of LSPR-mediated enhanced fluorescence excited by S- and P-polarized light on a two-dimensionally assembled silver nanoparticle sheet

Ayumi Ishijima, Pangpang Wang, Sou Ryuzaki, Koichi Okamoto, Kaoru Tamada
Journal: Applied Physics Letters
Appl. Phys. Lett. 113, 171602 (2018)
https://doi.org/10.1063/1.5056211
Published: October 2018
View article titled, Comparison of LSPR-mediated enhanced fluorescence excited by S- and P-polarized light on a two-dimensionally assembled silver nanoparticle sheet
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Includes: Supplementary data
Journal Articles

Stochastic approach to simulation of evaporation-triggered multiple self-assembly of mixed metal nanoparticles and their variable superradiance

Mamoru Tamura, Koichi Okamoto, Kaoru Tamada, Takuya Iida
Journal: Applied Physics Letters
Appl. Phys. Lett. 112, 033106 (2018)
https://doi.org/10.1063/1.5005830
Published: January 2018
View article titled, Stochastic approach to simulation of evaporation-triggered multiple self-assembly of mixed metal nanoparticles and their variable superradiance
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Includes: Supplementary data
Journal Articles

Micro-photoluminescence mapping of surface plasmon enhanced light emissions from InGaN/GaN quantum wells

Kazutaka Tateishi, Pangpang Wang, Sou Ryuzaki, Mitsuru Funato, Yoichi Kawakami, Koichi Okamoto, Kaoru Tamada
Journal: Applied Physics Letters
Appl. Phys. Lett. 111, 172105 (2017)
https://doi.org/10.1063/1.4998798
Published: October 2017
View article titled, Micro-photoluminescence mapping of surface plasmon enhanced light emissions from InGaN/GaN quantum wells
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Includes: Supplementary data
Journal Articles

Enhancement of light emission and internal quantum efficiency in orange and red regions for regularly arrayed InGaN/GaN nanocolumns due to surface plasmon coupling

Takao Oto, Kazuma Kikuchi, Koichi Okamoto, Katsumi Kishino
Journal: Applied Physics Letters
Appl. Phys. Lett. 111, 133110 (2017)
https://doi.org/10.1063/1.5005517
Published: September 2017
View article titled, Enhancement of light emission and internal quantum efficiency in orange and red regions for regularly arrayed InGaN/GaN nanocolumns due to surface plasmon coupling
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Journal Articles

Hydrophilic polymer composites synthesized by electrospinning under dense carbon dioxide

Wahyudiono, Koichi Okamoto, Siti Machmudah, Hideki Kanda, Motonobu Goto
Journal: AIP Conference Proceedings
AIP Conf. Proc. 1699, 040010 (2015)
https://doi.org/10.1063/1.4938325
Published: December 2015
View article titled, Hydrophilic polymer composites synthesized by electrospinning under dense carbon dioxide
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Journal Articles

Silver nanoparticles with tunable work functions

Pangpang Wang, Daisuke Tanaka, Sou Ryuzaki, Shohei Araki, Koichi Okamoto, Kaoru Tamada
Journal: Applied Physics Letters
Appl. Phys. Lett. 107, 151601 (2015)
https://doi.org/10.1063/1.4933253
Published: October 2015
View article titled, Silver nanoparticles with tunable work functions
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Journal Articles

Highly enhanced green emission from InGaN quantum wells due to surface plasmon resonance on aluminum films

Kazutaka Tateishi, Mitsuru Funato, Yoichi Kawakami, Koichi Okamoto, Kaoru Tamada
Journal: Applied Physics Letters
Appl. Phys. Lett. 106, 121112 (2015)
https://doi.org/10.1063/1.4916392
Published: March 2015
View article titled, Highly enhanced green emission from InGaN quantum wells due to surface plasmon resonance on aluminum films
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Journal Articles

Quantification of the internal quantum efficiency in GaN via analysis of the heat generated by non-radiative recombination processes

Yoichi Kawakami, Kohei Inoue, Akio Kaneta, Koichi Okamoto, Mitsuru Funato
Journal: Journal of Applied Physics
J. Appl. Phys. 117, 105702 (2015)
https://doi.org/10.1063/1.4914413
Published: March 2015
View article titled, Quantification of the internal quantum efficiency in GaN via analysis of the heat generated by non-radiative recombination processes
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Journal Articles

Highly confined, enhanced surface fluorescence imaging with two-dimensional silver nanoparticle sheets

Eiji Usukura, Shuhei Shinohara, Koichi Okamoto, Jaehoon Lim, Kookheon Char, Kaoru Tamada
Journal: Applied Physics Letters
Appl. Phys. Lett. 104, 121906 (2014)
https://doi.org/10.1063/1.4869560
Published: March 2014
View article titled, Highly confined, enhanced surface fluorescence imaging with two-dimensional silver nanoparticle sheets
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Journal Articles

Fabrication of micro-hollow fiber by electrospinning process in near-critical carbon dioxide

Koichi Okamoto, Wahyudiono, Siti Machmudah, Hideki Kanda, Satoko Okubayashi, Ryuichi Fukuzato, Motonobu Goto
Journal: AIP Conference Proceedings
AIP Conf. Proc. 1586, 43–47 (2014)
https://doi.org/10.1063/1.4866727
Published: February 2014
View article titled, Fabrication of micro-hollow fiber by electrospinning process in near-critical carbon dioxide
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Journal Articles

Low core loss of non-Si quaternary Fe83.3B8P8Cu0.7 nanocrystalline alloy with high Bs of 1.7 T

Akiri Urata, Makoto Yamaki, Masahiko Takahashi, Koichi Okamoto, Hiroyuki Matsumoto, Shigeyoshi Yoshida, Akihiro Makino
Journal: Journal of Applied Physics
Series: Magnetism and Magnetic Materials
J. Appl. Phys. 111, 07A335 (2012)
https://doi.org/10.1063/1.3679467
Published: February 2012
View article titled, Low core loss of non-Si quaternary Fe<sub>83.3</sub>B<sub>8</sub>P<sub>8</sub>Cu<sub>0.7</sub> nanocrystalline alloy with high <em>B<sub>s</sub></em> of 1.7 T
Open the PDF for Low core loss of non-Si quaternary Fe<sub>83.3</sub>B<sub>8</sub>P<sub>8</sub>Cu<sub>0.7</sub> nanocrystalline alloy with high <em>B<sub>s</sub></em> of 1.7 T in another window
Journal Articles

Time resolved photoluminescence spectroscopy of surface-plasmon-enhanced light emission from conjugate polymers

Terrell D. Neal, Koichi Okamoto, Axel Scherer, Michelle S. Liu, Alex K.-Y. Jen
Journal: Applied Physics Letters
Appl. Phys. Lett. 89, 221106 (2006)
https://doi.org/10.1063/1.2397481
Published: November 2006
View article titled, Time resolved photoluminescence spectroscopy of surface-plasmon-enhanced light emission from conjugate polymers
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Journal Articles

Ultralow threshold on-chip microcavity nanocrystal quantum dot lasers

Bumki Min, Sungjee Kim, Koichi Okamoto, Lan Yang, Axel Scherer, Harry Atwater, Kerry Vahala
Journal: Applied Physics Letters
Appl. Phys. Lett. 89, 191124 (2006)
https://doi.org/10.1063/1.2387966
Published: November 2006
View article titled, Ultralow threshold on-chip microcavity nanocrystal quantum dot lasers
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