Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications

Takuto Yamaguchi; Naoki Fushimi; Masaharu Hida; Hirokazu Hosoi; Manabu Ohtomo; Tetsuya Miyatake; Shoichi Miyahara; Toshiyuki Miyazawa; Kenichi Kawaguchi; Ryoichi Ishihara; Shintaro Sato

doi:10.35848/1347-4065/adb166

Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications

Takuto Yamaguchi^*, Naoki Fushimi, Masaharu Hida, Hirokazu Hosoi, Manabu Ohtomo, Tetsuya Miyatake, Shoichi Miyahara, Toshiyuki Miyazawa, Kenichi Kawaguchi, Ryoichi Ishihara, Shintaro Sato

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

Low-loss visible-light photonic circuits are crucial for high-performance photonic quantum processors. By using aluminum oxide (Al₂O₃) for its low visible-light absorption, we achieved waveguides exhibiting an exceptionally low propagation loss (1.39 dB/cm for the transverse electric mode) at red-light wavelengths. Directional coupler beam splitters fabricated using this platform exhibited good controllability of the optical splitting ratios. Furthermore, we fabricated a half beam splitter, which is an essential component of entangled photon generation in quantum optics. These results represent a significant advance toward developing low-loss photonic circuits, paving the way for improved performance in photonic quantum processors.

Original language	English
Article number	02SP32
Number of pages	7
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	64
Issue number	2
DOIs	https://doi.org/10.35848/1347-4065/adb166
Publication status	Published - 2025

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

alumina
aluminium oxide
beam splitter
optical waveguide
visible light

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10.35848/1347-4065/adb166

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Yamaguchi, T., Fushimi, N., Hida, M., Hosoi, H., Ohtomo, M., Miyatake, T., Miyahara, S., Miyazawa, T., Kawaguchi, K., Ishihara, R., & Sato, S. (2025). Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 64(2), Article 02SP32. https://doi.org/10.35848/1347-4065/adb166

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title = "Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications",

abstract = "Low-loss visible-light photonic circuits are crucial for high-performance photonic quantum processors. By using aluminum oxide (Al2O3) for its low visible-light absorption, we achieved waveguides exhibiting an exceptionally low propagation loss (1.39 dB/cm for the transverse electric mode) at red-light wavelengths. Directional coupler beam splitters fabricated using this platform exhibited good controllability of the optical splitting ratios. Furthermore, we fabricated a half beam splitter, which is an essential component of entangled photon generation in quantum optics. These results represent a significant advance toward developing low-loss photonic circuits, paving the way for improved performance in photonic quantum processors.",

keywords = "alumina, aluminium oxide, beam splitter, optical waveguide, visible light",

author = "Takuto Yamaguchi and Naoki Fushimi and Masaharu Hida and Hirokazu Hosoi and Manabu Ohtomo and Tetsuya Miyatake and Shoichi Miyahara and Toshiyuki Miyazawa and Kenichi Kawaguchi and Ryoichi Ishihara and Shintaro Sato",

note = "Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.",

year = "2025",

doi = "10.35848/1347-4065/adb166",

language = "English",

volume = "64",

journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers",

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Yamaguchi, T, Fushimi, N, Hida, M, Hosoi, H, Ohtomo, M, Miyatake, T, Miyahara, S, Miyazawa, T, Kawaguchi, K , Ishihara, R & Sato, S 2025, 'Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications', Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, vol. 64, no. 2, 02SP32. https://doi.org/10.35848/1347-4065/adb166

Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications. / Yamaguchi, Takuto; Fushimi, Naoki; Hida, Masaharu et al.
In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 64, No. 2, 02SP32, 2025.

Research output: Contribution to journal › Article › Scientific › peer-review

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T1 - Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications

AU - Yamaguchi, Takuto

AU - Fushimi, Naoki

AU - Hida, Masaharu

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AU - Ohtomo, Manabu

AU - Miyatake, Tetsuya

AU - Miyahara, Shoichi

AU - Miyazawa, Toshiyuki

AU - Kawaguchi, Kenichi

AU - Ishihara, Ryoichi

AU - Sato, Shintaro

N1 - Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2025

Y1 - 2025

N2 - Low-loss visible-light photonic circuits are crucial for high-performance photonic quantum processors. By using aluminum oxide (Al2O3) for its low visible-light absorption, we achieved waveguides exhibiting an exceptionally low propagation loss (1.39 dB/cm for the transverse electric mode) at red-light wavelengths. Directional coupler beam splitters fabricated using this platform exhibited good controllability of the optical splitting ratios. Furthermore, we fabricated a half beam splitter, which is an essential component of entangled photon generation in quantum optics. These results represent a significant advance toward developing low-loss photonic circuits, paving the way for improved performance in photonic quantum processors.

AB - Low-loss visible-light photonic circuits are crucial for high-performance photonic quantum processors. By using aluminum oxide (Al2O3) for its low visible-light absorption, we achieved waveguides exhibiting an exceptionally low propagation loss (1.39 dB/cm for the transverse electric mode) at red-light wavelengths. Directional coupler beam splitters fabricated using this platform exhibited good controllability of the optical splitting ratios. Furthermore, we fabricated a half beam splitter, which is an essential component of entangled photon generation in quantum optics. These results represent a significant advance toward developing low-loss photonic circuits, paving the way for improved performance in photonic quantum processors.

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Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications

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