Dr. Kouichi Akahane Profile

Dr. Kouichi Akahane

Director at NICT

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Author

Publications (41)

Proceedings Article | 13 March 2024 Poster

64-Gbps NRZ-OOK wavelength demultiplexing filter with cascaded silicon Mach-Zehnder interferometer

Chih-Hsien Cheng, Yu-Lun Juan, Kuo-Fang Chung, Ding-Wei Huang, Atsushi Matsumoto, Naokatsu Yamamoto, Gong-Ru Lin, Kouichi Akahane

Proceedings Volume PC12891, PC128910J (2024) https://doi.org/10.1117/12.3002026

KEYWORDS: Tunable filters, Silicon, Wavelength division multiplexing, Mach-Zehnder interferometers, Waveguides, Optical transmission, Directional couplers, Data communications, Telecommunications, Standards development

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Proceedings Article | 13 March 2024 Presentation

Ge CWDM receiver with MZI demultiplexer for 480-Gbps O-band SMF link over 2 km without DSP compensation

Chih-Hsien Cheng, Atsushi Matsumoto, Naokatsu Yamamoto, Ding-Wei Huang, Gong-Ru Lin, Kouichi Akahane

Proceedings Volume PC12891, PC128910C (2024) https://doi.org/10.1117/12.2692275

KEYWORDS: Digital signal processing, Germanium, Coarse wavelength division multiplexing, Wavelength division multiplexing, Single mode fibers, Receivers, Wavelet packet decomposition, Standards development, Demultiplexers, 3D imaging standards

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Proceedings Article | 11 March 2024 Presentation + Paper

60-GHz low-phase noise optical-electrical oscillator using newly developed high-power photoreceiver module

T. Umezawa, Y. Yamaguchi, A. Matsumoto, A. Kanno, K. Akahane, N. Yamamoto

Proceedings Volume 12885, 128850E (2024) https://doi.org/10.1117/12.2691056

KEYWORDS: Oscillators, Modulators, Design, Photocurrent, Feedback loops, Telecommunications, Integrated optics, Signal attenuation, Optical modulators, Frequency response

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Proceedings Article | 9 March 2024 Presentation

Experimental investigation of DSP complexity of low-power beyond-300G IM-DD short-reach links

Paikun Zhu, Yuya Yamaguchi, Yuki Yoshida, Tien Dat Pham, Masayuki Motoya, Shingo Takano, Ryo Shimizu, Kouichi Akahane, Ken-ichi Kitayama

Proceedings Volume PC12894, PC1289402 (2024) https://doi.org/10.1117/12.2692260

KEYWORDS: Digital signal processing, Radio optics, Forward error correction, Transmitters, Receivers, Standards development, Pulse signals, Power consumption, Optical transmission, Modulation

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Proceedings Article | 8 March 2024 Presentation + Paper

Improved efficiency of generating femtosecond photon echoes from quantum dots using chirped pulses and time resolved measurement by frequency up-conversion technique

Yuta Kochi, Yutaro Kinoshita, Sunao Kurimura, Kouichi Akahane, Junko Ishi-Hayase

Proceedings Volume 12884, 128840E (2024) https://doi.org/10.1117/12.3002122

KEYWORDS: Quantum memory, Pulse signals, Quantum dots, Femtosecond phenomena, Quantum efficiency, Quantum reading, Quantum measurement, Inhomogeneities, Quantum signals

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Proceedings Article | 18 March 2023 Presentation + Paper

Silica nanoparticles coating in silicon nitride photonic label-free biosensing of S100 calcium-binding protein A6

Suruk Udomsom, Phornsawat Baipaywad, Pathinan Paengnakorn, Ukrit Mankong, Nipon Theera-Umpon, Toshimasa Umezawa, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Kouichi Akahane, Manuel Mendez-Astudillo, Nithi Atthi, Wittawat Yamwong, Nipapan Klunngien, Rattanawan Meananeatra, Kitti Intuyod, Somchai Pinlaor, Tetsuya Kawanishi, Kazuo Imai

Proceedings Volume 12395, 1239502 (2023) https://doi.org/10.1117/12.2648777

KEYWORDS: Nanoparticles, Silica, Silicon nitride, Coating, Biosensing, Silicon photonics, Proteins, Antibodies, Biomedical optics, Waveguides

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Proceedings Article | 15 March 2023 Poster + Paper

Femtosecond time-bin pulse transfer and retrieval on photon-echo-based quantum memory using quantum dots

Yuta Kochi, Yutaro Kinoshita, Sunao Kurimura, Kouichi Akahane, Junko Ishi-Hayase

Proceedings Volume 12430, 1243014 (2023) https://doi.org/10.1117/12.2649556

KEYWORDS: Quantum memory, Quantum dots, Pulse signals, Femtosecond phenomena, Femtosecond pulse shaping, Quantum reading, Picosecond phenomena, Time correlated photon counting, Inhomogeneities, Quantum data

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Proceedings Article | 14 March 2023 Presentation

Fabrication of ultra-low-density InAs quantum dots on InP(311)B substrates for telecom-band single-photon sources (Conference Presentation)

Kouichi Akahane, Kiyora Kaneki, Atsushi Matsumoto, Toshimasa Umezawa, Naokatsu Yamamoto, Tomohiro Maeda, Hideyuki Sotobayashi, Yoriko Tominaga, Atsushi Kanno

Proceedings Volume 12417, 124170C (2023) https://doi.org/10.1117/12.2648147

KEYWORDS: Indium arsenide, Quantum dots, Chemical species, Quantum computing, Quantum communications, Bismuth, Telecommunications, Single photon, Semiconductors, Optical semiconductors

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Proceedings Article | 13 March 2023 Presentation

100 GHz optical-to-radio converter and its startup performance driven by power over fiber

Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto

Proceedings Volume PC12420, PC1242002 (2023) https://doi.org/10.1117/12.2646951

KEYWORDS: Radio optics, Phase only filters, Hybrid fiber radio, Wireless communications, Windows, Radio over Fiber, RF communications, Photodetectors, Optical communications, Optical amplifiers

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Proceedings Article | 10 March 2020 Presentation

90-GHz +15 dBm high-output integrated photoreceiver driven by only photonic power supply (Conference Presentation)

Toshimasa Umezawa, Atsushi Kanno, Pham Dat, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi

Proceedings Volume 11279, 112791L (2020) https://doi.org/10.1117/12.2543105

KEYWORDS: Power supplies, Optical fibers, Radio over Fiber, Phase only filters, Hybrid fiber radio, Photodetectors, Space division multiplexing, Multiplexing, Receivers, Signal attenuation

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Proceedings Article | 9 March 2020 Presentation

Fabrication of a laser diode at 1600 nm with InAs quantum dots using a digital embedding method on an InP(311)B substrate (Conference Presentation)

Kouichi Akahane, Hiroyuki Yamamoto, Atsushi Matsumoto, Toshimasa Umezawa, Hideyuki Sotobayashi, Naokatsu Yamamoto

Proceedings Volume 11301, 1130108 (2020) https://doi.org/10.1117/12.2544589

KEYWORDS: Semiconductor lasers, Indium arsenide, Quantum dots, Superlattices, Metals, Waveguides, Laser damage threshold, Semiconducting wafers, Molecular beam epitaxy, Cladding

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Proceedings Article | 31 December 2019 Paper

Electronic and optical properties of Dirac semimetals in InAs/GaInSb superlattice nanostructures

Mikhail Patrashin, Norihiko Sekine, Kouichi Akahane, Akifumi Kasamatsu, Iwao Hosako

Proceedings Volume 11201, 112010N (2019) https://doi.org/10.1117/12.2541284

KEYWORDS: Indium arsenide, Superlattices, Optical properties, Magnetism, Nanostructures, Crystals, Quasiparticles

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Proceedings Article | 5 March 2019 Presentation

Photon echo generation using chirped pulses in quantum dots (Conference Presentation)

Masanari Watanabe, Naoto Aonuma, Kouichi Akahane, Junko Ishi-Hayase

Proceedings Volume 10916, 109160G (2019) https://doi.org/10.1117/12.2508198

KEYWORDS: Quantum information, Quantum dots, Interfaces, Information technology, Terahertz radiation, Telecommunications, Excitons, Femtosecond phenomena, Numerical simulations

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Proceedings Article | 4 March 2019 Paper

Quantum state tomography of ultrafast optical pulses at telecom wavelength by broadband balanced homodyne detection

Terence Blésin, Rei Matsushita, Kouichi Akahane, Junko Ishi-Hayase

Proceedings Volume 10933, 109330V (2019) https://doi.org/10.1117/12.2507827

KEYWORDS: Homodyne detection, Photons, Oscillators, Ultrafast phenomena, Signal detection, Quantum dots, Reconstruction algorithms, Radon transform, Quantum communications, Tomography

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Proceedings Article | 24 October 2018 Paper

Development of Tm,Ho: YLF laser for future space-based doppler wind lidar

Shoken Ishii, Atsushi Sato, Makoto Aoki, Kouichi Akahane, Shigeo Nagano, Katsuhiro Nakagawa, Kaori Sato, Hajime Okamoto

Proceedings Volume 10779, 1077903 (2018) https://doi.org/10.1117/12.2324388

KEYWORDS: Pulsed laser operation, Laser development, Wind energy, Rod lasers, Wind measurement, LIDAR, Oscillators, Molybdenum, Doppler effect, Thulium

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Proceedings Article | 23 February 2018 Paper

Study of high power generation in UTC-PD at 110-210 GHz

Toshimasa Umezawa, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi

Proceedings Volume 10531, 1053115 (2018) https://doi.org/10.1117/12.2287589

KEYWORDS: Capacitance, Photodetectors, Wireless communications, Chromium, Absorption, Photodiodes, Terahertz radiation, Diffusion, Indium gallium arsenide, Waveguides

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Proceedings Article | 22 February 2018 Presentation + Paper

Characteristics-improvement of QD semiconductor optical amplifier using rapid-thermal annealing process

Budsara Boriboon, Duang-rudee Worasucheep, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Naoya Wada

Proceedings Volume 10528, 105280F (2018) https://doi.org/10.1117/12.2288608

KEYWORDS: Internal quantum efficiency, Quantum dots, Annealing, Semiconductor lasers, Semiconductor optical amplifiers, External quantum efficiency, Quantum optics, Optical amplifiers, Quantum dot lasers

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Proceedings Article | 19 April 2017 Presentation

Growth of GaAs/AlAs distributed Bragg reflector on a concave GaAs substrate (Conference Presentation)

Kouichi Akahane, Tetsuya Ido, Naokatsu Yamamoto, Kazuto Mochizuki, Yusuke Furukawa

Proceedings Volume 10100, 1010019 (2017) https://doi.org/10.1117/12.2251380

KEYWORDS: Free space, Optical resonators, Distributed Bragg reflectors, Gallium arsenide, Dielectrics, Reflection, Free space optics, Mirrors, Crystals, Surface finishing

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Proceedings Article | 20 February 2017 Presentation + Paper

Temperature dependence of gain in a highly stacked quantum-dot semiconductor optical amplifiier

Naoya Yoshida, Yuu Fukae, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Matsumoto, Toshimasa Umezawa, Hideyuki Sotobayashi

Proceedings Volume 10100, 1010017 (2017) https://doi.org/10.1117/12.2251194

KEYWORDS: Semiconductor optical amplifiers, Semiconductors, Optical amplifiers, Indium arsenide, Quantum dots, Fiber optic communications, Optical components, Temperature metrology, Optical communications, Photon transport

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Proceedings Article | 28 January 2017 Presentation + Paper

High-voltage optical power delivery using a light-wave-modulation method

Naokatsu Yamamoto, Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Atsushi Kobayashi, Hiroshi Takai

Proceedings Volume 10128, 101280F (2017) https://doi.org/10.1117/12.2250819

KEYWORDS: Radio optics, Modulation, Optical fibers, Receivers, Phase only filters, Transformers, Photonics, Photodetectors, Antennas, Light sources

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Proceedings Article | 28 January 2017 Presentation + Paper

High-responsivity 100GHz waveguide UTC photodetector

T. Umezawa, K. Akahane, A. Matsumoto, A. Kanno, N. Yamamoto, T. Kawanishi

Proceedings Volume 10128, 1012807 (2017) https://doi.org/10.1117/12.2250246

KEYWORDS: Waveguides, Cladding, Photodetectors, Back illuminated sensors, Indium gallium arsenide, Structured optical fibers, Absorption, Optical fibers, Palladium, Measurement devices

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Proceedings Article | 25 February 2016 Paper

High-efficiency W-band hybrid integrated photoreceiver module using UTC-PD and pHEMT amplifier

T. Umezawa, K. Katshima, A. Kanno, K. Akahane, A. Matsumoto, N. Yamamoto, T. Kawanishi

Proceedings Volume 9747, 97470D (2016) https://doi.org/10.1117/12.2209735

KEYWORDS: Amplifiers, Optical amplifiers, Photodetectors, Connectors, Wireless communications, Transistors, Radio over Fiber, Interfaces, Metals, Waveguides

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Proceedings Article | 16 March 2015 Paper

Monolithically integrated quantum dot optical gain modulator with semiconductor optical amplifier for 10-Gb/s photonic transmission

Naokatsu Yamamoto, Kouichi Akahane, Toshimasa Umezawa, Tetsuya Kawanishi

Proceedings Volume 9359, 93591E (2015) https://doi.org/10.1117/12.2077346

KEYWORDS: Integrated optics, Photonic devices, Quantum dots, Terahertz radiation, Optical modulators, Modulators, Semiconductor optical amplifiers, Data transmission, Gallium arsenide, Quantum optics

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Proceedings Article | 14 March 2015 Paper

High-performance PIN photodetector at 67 GHz and beyond for radio over fiber applications

T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, T. Kawanishi

Proceedings Volume 9362, 93620T (2015) https://doi.org/10.1117/12.2078616

KEYWORDS: Absorption, Photodetectors, Resistance, Hybrid fiber radio, Palladium, Radio over Fiber, Metals, Indium gallium arsenide, Signal detection, Fourier transforms

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Proceedings Article | 5 February 2013 Paper

1.3-μm waveband multiple-wavelength InAs/InGaAs quantum dot light source for wide wavelength range of 10 Gb/s transmissions over 8-km long holey fiber

Yasuaki Kurata, Naokatsu Yamamoto, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi, Yuki Yoshioka, Hiroshi Takai

Proceedings Volume 8646, 86460S (2013) https://doi.org/10.1117/12.2002724

KEYWORDS: Light sources, Quantum dots, Wavelength division multiplexing, Data transmission, Quantum wells, Photon transport, Fabry–Perot interferometers, Optical filters, Photonics systems, Gallium arsenide

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Proceedings Article | 15 February 2012 Paper

3.0-μm wavelength-tunable compact light source with 805/1064-nm differential frequency generation using intracavity photon reuse and spectrum shaping techniques

Naokatsu Yamamoto, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi

Proceedings Volume 8235, 823504 (2012) https://doi.org/10.1117/12.907580

KEYWORDS: Mid-IR, Light sources, Crystals, Wavelength tuning, Semiconductor lasers, Fabry–Perot interferometers, Sum-frequency generation, Laser crystals, Mirrors, Light

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Proceedings Article | 9 February 2012 Paper

Stacking-layer-number dependence of highly stacked InAs quantum dot laser diodes fabricated using strain-compensation technique

Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi, Sergio Bietti, Ayami Takata, Yoshitaka Okada

Proceedings Volume 8277, 827703 (2012) https://doi.org/10.1117/12.907533

KEYWORDS: Semiconductor lasers, Laser damage threshold, Indium arsenide, Fabrication, Diodes, Cladding, Internal quantum efficiency, Quantum dot lasers, Quantum dots, Optical components

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Proceedings Article | 25 January 2012 Paper

Polarization division multiplexed 2x10-Gbps transmissions over 10-km long holey fiber in 1.0-μm waveband photonic transport system

Naokatsu Yamamoto, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi, Yu Omigawa, Yasuaki Kurata, Hideyuki Sotobayashi

Proceedings Volume 8283, 82830A (2012) https://doi.org/10.1117/12.907955

KEYWORDS: Photon transport, Photonics systems, Polarization, Photon polarization, Multiplexing, L band, Data transmission, Wavelength division multiplexing, Optical fibers, Receivers

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Proceedings Article | 13 October 2011 Paper

Type-II InAs/GaInSb superlattices for terahertz range photodetectors

Mikhail Patrashin, Iwao Hosako, Kouichi Akahane

Proceedings Volume 8188, 81880G (2011) https://doi.org/10.1117/12.898759

KEYWORDS: Stereolithography, Indium arsenide, Superlattices, Terahertz radiation, Gallium antimonide, Atomic force microscopy, Photodetectors, Interfaces, Electrons, Sensors

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Proceedings Article | 11 May 2011 Paper

Photonic crystal fiber based ultra-broadband transmission system for waveband division multiplexing

Yu Omigawa, Yuta Kinoshita, Naokatsu Yamamoto, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi

Proceedings Volume 8073, 80732T (2011) https://doi.org/10.1117/12.886609

KEYWORDS: Photon transport, Photonics systems, Photonic crystal fibers, Wavelength division multiplexing, Data transmission, L band, Receivers, Multiplexing, Optical communications, Photonic crystals

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Proceedings Article | 24 January 2011 Paper

Development of broadband optical frequency resource over 8.4-THz in 1.0-um waveband for photonic transport systems

Naokatsu Yamamoto, Yu Omigawa, Yuta Kinoshita, Atsushi Kannno, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi

Proceedings Volume 7958, 79580F (2011) https://doi.org/10.1117/12.874561

KEYWORDS: Photon transport, Photonics systems, Polarization, Wavelength division multiplexing, Photon polarization, Optical fibers, Terahertz radiation, L band, Data transmission, Multiplexing

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Proceedings Article | 16 February 2010 Paper

Self-assembled InAs quantum dots within a vertical cavity structure for all-optical switching devices

C. Y. Jin, O. Kojima, T. Inoue, T. Kita, O. Wada, M. Hopkinson, K. Akahane

Proceedings Volume 7610, 76100Q (2010) https://doi.org/10.1117/12.846621

KEYWORDS: Switching, Reflectivity, Mirrors, Switches, Absorption, Nonlinear optics, Solids, Quantum dots, Picosecond phenomena, Indium arsenide

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Proceedings Article | 23 January 2010 Paper

1-μm waveband and C-band, 10-Gbps error-free operation of ultra-broadband photonic transport system with holey fiber

Naokatsu Yamamoto, Yu Omigawa, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi

Proceedings Volume 7621, 76210N (2010) https://doi.org/10.1117/12.842924

KEYWORDS: Photon transport, Photonics systems, Wavelength division multiplexing, Optical amplifiers, Optical communications, Receivers, Optical fibers, Semiconductors, Fiber amplifiers, Telecommunications

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Proceedings Article | 2 September 2009 Paper

Fabrication of III-V semiconductor quantum dots

Kouichi Akahane, Naokatsu Yamamoto

Proceedings Volume 7395, 739507 (2009) https://doi.org/10.1117/12.824233

KEYWORDS: Indium arsenide, Gallium arsenide, Chemical species, Silicon, Atomic force microscopy, Nanophotonics, Near field scanning optical microscopy, Aluminum, Quantum dots, Semiconductors

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Proceedings Article | 26 January 2009 Paper

1-μm- band transmission by use of a wavelength tunable quantum-dot laser over a hole-assisted fiber

R. Katouf, N. Yamamoto, K. Akahane, T. Kawanishi, H. Sotobayashi

Proceedings Volume 7234, 72340G (2009) https://doi.org/10.1117/12.815336

KEYWORDS: Semiconductor lasers, Light sources, Photon transport, Tunable lasers, Fiber lasers, Single mode fibers, Dispersion, Eye, Photonics systems, Terahertz radiation

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Proceedings Article | 10 September 2007 Paper

Strain-compensated quantum dots emitting at 1.5 micron: resonant nonlinear optical properties and exciton dynamics

Junko Ishi-Hayase, Kouichi Akahane, Naokatsu Yamamoto, Mamiko Kujiraoka, Kazuhiro Ema, Masahide Sasaki

Proceedings Volume 6779, 677903 (2007) https://doi.org/10.1117/12.732348

KEYWORDS: Excitons, Polarization, Anisotropy, Spectroscopy, Quantum dots, Indium arsenide, Telecommunications, Picosecond phenomena, Crystals, Four wave mixing

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Proceedings Article | 10 September 2007 Paper

Silicon based photonic network devices and materials

N. Yamamoto, K. Akahane, Y. Naka, M. Kishi, H. Sugawara, T. Kawanishi, Y. Nakamura, M. Tsuchiya

Proceedings Volume 6775, 67750O (2007) https://doi.org/10.1117/12.732951

KEYWORDS: Silicon, Waveguides, Silicon photonics, Polarization, Semiconducting wafers, Group III-V semiconductors, Wafer-level optics, Switching, Photonic devices, Nanowires

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Proceedings Article | 2 October 2006 Paper

Sb-based quantum dots for creating novel light-emitting devices for optical communications

Naokatsu Yamamoto, Kouichi Akahane, Shin-ichirou Gozu, Akio Ueta, Naoki Ohtani, Masahiro Tsuchiya

Proceedings Volume 6393, 63930A (2006) https://doi.org/10.1117/12.685665

KEYWORDS: Gallium arsenide, Silicon, Vertical cavity surface emitting lasers, Chemical species, Antimony, Mirrors, Semiconducting wafers, Optical communications, Quantum dots, Gallium

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Proceedings Article | 2 October 2006 Paper

Growth of antimonide compound semiconductor on Si(001) substrate

Kouichi Akahane, Naokatsu Yamamoto, Shin-ichiro Gozu, Akio Ueta, Naoki Ohtani, Masahiro Tsuchiya

Proceedings Volume 6389, 63890O (2006) https://doi.org/10.1117/12.685690

KEYWORDS: Gallium antimonide, Silicon, Quantum wells, Gallium, Crystals, Diffusion, Antimony, Chemical species, Compound semiconductors, Optical components

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Proceedings Article | 2 October 2006 Paper

Nonlinear absorption of highly stacked InAs quantum dot layers on an InP(311) substrate

Toshiro Isu, Jun Inoue, Kouichi Akahane, Hideyuki Sotobayashi, Masahiro Tsuchiya

Proceedings Volume 6393, 639309 (2006) https://doi.org/10.1117/12.685616

KEYWORDS: Transmittance, Mode locking, Absorption, Quantum dots, Indium arsenide, Saturable absorption, Picosecond phenomena, Reflectivity, Semiconductors, Modulation

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Proceedings Article | 28 February 2006 Paper

Exciton dephasing in strain-compensated self-assembled InAs quantum dots

Junko Ishi-Hayase, Kouichi Akahane, Naokatsu Yamamoto, Mamiko Kujiraoka, Kazuhiro Ema, Masahide Sasaki

Proceedings Volume 6115, 61151O (2006) https://doi.org/10.1117/12.661300

KEYWORDS: Excitons, Indium arsenide, Quantum dots, Picosecond phenomena, Polarization, Gallium arsenide, Anisotropy, Four wave mixing, Crystals, Neodymium

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Showing 5 of 41 publications

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