Koichi Okamoto

Metropolitan University — VE

Physics and Astronomy · Physical Sciences

37h-index6.4kcitations376works2.42yr avg
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Research Topics

GaN-based semiconductor devices and materials(94), Plasmonic and Surface Plasmon Research(83), Gold and Silver Nanoparticles Synthesis and Applications(59), Photonic and Optical Devices(42), Optical Coatings and Gratings(40)

Publications376 total

Tunable small-angle nonreciprocal radiation and broadband absorption in a GST–Weyl semimetal resonant structure
Applied Physics Letters·2026
Accelerating Luminescence in Nanostructures: Exploring the Physical Limits and Impact of Ultrafast Emission in Nanoscale Materials
Advanced Photonics Research·2025Open Access
Tunable optical properties via plasmonic metaphotonics with random and regular nanostructures
2025
Enhanced Localized Electric Field from Surface Plasmon Coupling in a Silver Nanostructure Array with a Silver Thin Film for Bioimaging and Biosensing
Photonics·2025Open Access
Emission Enhancement of ZnO Thin Films in Ultraviolet Wavelength Region Using Au Nano-Hemisphere on Al Mirror Structures
Nanomaterials·2025· 4 citedOpen Access
Correlated photoluminescence blinking phenomenon on InGaN/GaN nanopillar structures
Applied Physics Letters·2024
New advancements in semiconductor optical devices based on plasmonics and nanophotonics
2024
Optical Properties and Applications of Diffraction Grating Using Localized Surface Plasmon Resonance with Metal Nano-Hemispheres
Nanomaterials·2024· 4 citedOpen Access
Tunable Plasmon Resonance in Silver Nanodisk-on-Mirror Structures and Scattering Enhancement by Annealing
Nanomaterials·2024· 5 citedOpen Access
High-efficiency green light emission from InGaN/GaN using localized surface plasmon resonance tuned by combination of Ag nanoparticles and dielectric thin film
Optics Express·2024Open Access
Evaluation of Phototoxicity of Short-Wavelength Laser Light Utilizing PCNA Accumulation
Micromachines·2024Open Access
Novel Plasmonic Metamaterials Based on Metal Nano-Hemispheres and Metal-Dielectric Composites
Photonics·2024· 4 citedOpen Access
Effect of thermal annealing on the surface plasmon properties of gold and silver nanodisk structures fabricated by electron beam lithography
Optical Materials Express·2024· 5 citedOpen Access
Design and Optimization of Silver Nanostructured Arrays in Plasmonic Metamaterials for Sensitive Imaging Applications
Photonics·2024· 12 citedOpen Access
Ultrasonic velocity change imaging of a human forearm
Japanese Journal of Applied Physics·2024Open Access
Two-Dimensional Empty Liquid Composed of a Patchy Metal Nanoparticle Network Structure for Transparent Plasmonic Devices
ACS Applied Nano Materials·2024· 1 cited
Spatial and time-resolved properties of emission enhancement in polar/semi-polar InGaN/GaN by surface plasmon resonance
Nanophotonics·2024· 6 citedOpen Access
Optimal Conditions for a Multimode Laser Diode with Delayed Optical Feedback in Terahertz Time-Domain Spectroscopy
Spectroscopy Journal·2023· 2 citedOpen Access
Plasmonic red-light-emission enhancement by honeycomb-latticed InGaN/GaN ordered fine nanocolumn arrays
Applied Physics Express·2023· 4 citedOpen Access
Propagation loss in polyfluorene waveguides due to nanometer-roughness at their interfaces, studied by amplified spontaneous emission measurements
Japanese Journal of Applied Physics·2023Open Access
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Frequent Co-authors

Yoichi Kawakami(12), Axel Scherer(9), Kaoru Tamada(9), Takashi Mukai(8), Yukio Narukawa(7), Masahide Terazima(7), Akio Kaneta(6), Noboru Hirota(5), Shigeo Fujita(4), Sou Ryuzaki(4), Pangpang Wang(4), Isamu Niki(3), H. Watanabe(3), M. Tanaka(3), T. Yanagi(3), Mitsuru Funato(3), ‪Keiji Yanai‬(3), Alexander Shvartser(2), T. Takamura(2), Terrell D. Neal(2)