988 citations · 4.6k across the 54 of their papers we have counts for
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Optical Properties of Chiral Three-Dimensional Photonic Crystals made from Semiconductors
Shun Takahashi, Takeyoshi Tajiri, Yasuhiko Arakawa +2
We perform a theoretical and numerical study of the optical properties of both direct and inverse three-dimensional (3D) chiral woodpile structures, and a corresponding chiral Brag…
Topologically-protected single-photon sources with topological slow light photonic crystal waveguides
Kazuhiro Kuruma, Hironobu Yoshimi, Yasutomo Ota +4
Slow light waveguides are advantageous for implementing high-performance single-photon sources required for scalable operation of integrated quantum photonic circuits (IQPCs), thou…
Unidirectional output from a quantum-dot single-photon source hybrid integrated on silicon
Ryota Katsumi, Yasutomo Ota, Takeyoshi Tajiri +4
We report a quantum-dot single-photon source (QD SPS) hybrid integrated on a silicon waveguide embedding a photonic crystal mirror, which reflects photons and enables efficient uni…
A large-scale single-mode array laser based on a topological edge mode
Natsuko Ishida, Yasutomo Ota, Wenbo Lin +3
Topological lasers have been intensively investigated as a strong candidate for robust single-mode lasers. A typical topological laser employs a single-mode topological edge state,…
Experimental demonstration of topological slow light waveguides in valley photonic crystals
Hironobu Yoshimi, Takuto Yamaguchi, Ryota Katsumi +3
We experimentally demonstrate topological slow light waveguides in valley photonic crystals (VPhCs). We employed a bearded interface formed between two topologically-distinct VPhCs…
Microcavity-based Generation of Full Poincaré Beams with Arbitrary Skyrmion Numbers
Wenbo Lin, Yasutomo Ota, Yasuhiko Arakawa +1
A full Poincaré (FP) beam possesses all possible optical spin states in its cross-section, which constitutes an optical analogue of a skyrmion. Until now, FP beams have been exclus…
Reflectivity of Finite 3D GaAs Photonic Band Gap Crystals
Takeyoshi Tajiri, Shun Takahashi, Cornelis A. M. Harteveld +3
We study the optical reflectivity of three-dimensional (3D) photonic band gap crystals with increasing thickness. The crystals consist of GaAs plates with nanorod arrays that are a…
Active topological photonics
Yasutomo Ota, Kenta Takata, Tomoki Ozawa +6
Topological photonics has emerged as a novel route to engineer the flow of light. Topologically-protected photonic edge modes, which are supported at the perimeters of topologicall…
Single plasmon generation in an InAs/GaAs quantum dot in a transfer-printed plasmonic microring resonator
Akihito Tamada, Yasutomo Ota, Kazuhiro Kuruma +3
We report single plasmon generation with a self-assembled InAs/GaAs quantum dot embedded in a plasmonic microring resonator. The plasmonic cavity based on a GaAs microring is defin…
GaAs valley photonic crystal waveguide with light-emitting InAs quantum dots
Takuto Yamaguchi, Yasutomo Ota, Ryota Katsumi +5
We report a valley photonic crystal (VPhC) waveguide in a GaAs slab with InAs quantum dots (QDs) as an internal light source exploited for experimental characterization of the wave…
Spin-dependent directional emission from an asymmetry optical waveguide with an embedded quantum dot ensemble
Wenbo Lin, Yasutomo Ota, Satoshi Iwamoto +1
In this study, we examine a photonic wire waveguide embedded with an ensemble of quantum dots that directionally emits into the waveguide depending on the spin state of the ensembl…
High-Q nanocavities in semiconductor-based three-dimensional photonic crystals
S. Takahashi, T. Tajiri, K. Watanabe +3
We experimentally demonstrated high quality factors (Q-factors) of nanocavities in three-dimensional photonic crystals by increasing the in-plane area of the structure. Entire stru…
Topological photonic crystal nanocavity laser
Yasutomo Ota, Ryota Katsumi, Katsuyuki Watanabe +2
Topological edge states exist at the interfaces between two topologically-distinct materials. The presence and number of such modes are deterministically predicted from the bulk-ba…
Transfer-printed quantum-dot nanolasers on a silicon photonic circuit
A. Osada, Y. Ota, R. Katsumi +3
Quantum-dot (QD) nanolasers integrated on a silicon photonic circuit are demonstrated for the first time. QD nanolasers based on one-dimensional photonic crystal nanocavities conta…
Giant optical rotation in a three-dimensional semiconductor chiral photonic crystal
S. Takahashi, A. Tandaechanurat, R. Igusa +4
Optical rotation is experimentally demonstrated in a semiconductor-based three-dimensional chiral photonic crystal (PhC) at a telecommunication wavelength. We design a rotationally…