Optical waveguides and beam splitters using low-loss aluminum oxide for visible-wavelength photonics applications
Takuto Yamaguchi (Fujitsu Limited)
Naoki Fushimi (Fujitsu Limited)
Masaharu Hida (Fujitsu Limited)
Hirokazu Hosoi (Fujitsu Limited)
Manabu Ohtomo (Fujitsu Limited)
Tetsuya Miyatake (Fujitsu Limited)
Shoichi Miyahara (Fujitsu Limited)
Toshiyuki Miyazawa (Fujitsu Limited)
Kenichi Kawaguchi (Fujitsu Limited)
Ryoichi Ishihara (TU Delft - QID/Ishihara Lab, TU Delft - Electrical Engineering, Mathematics and Computer Science, TU Delft - QuTech Advanced Research Centre)
Shintaro Sato (Fujitsu Limited)
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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.