2025-11-24 東京大学
光学メタサーフェスと薄膜光検出器アレイを集積したワンチップ高速光受信器の模式図
＜関連情報＞
- https://www.t.u-tokyo.ac.jp/press/pr2025-11-24-001
- https://www.t.u-tokyo.ac.jp/hubfs/press-release/2025/1124/001/text.pdf
- https://www.nature.com/articles/s41467-025-65984-6
機能的メタサーフェスを備えた超高速ワンチップ光受信機 Ultrafast one-chip optical receiver with functional metasurface
Go Soma,Tomohiro Akazawa,Eisaku Kato,Kento Komatsu,Mitsuru Takenaka,Yoshiaki Nakano & Takuo Tanemura
Nature Communications Published:24 November 2025
DOI:https://doi.org/10.1038/s41467-025-65984-6
Abstract
High-speed optical receivers are crucial in modern optical communication systems. While complex photonic integrated circuits (PICs) are widely employed to harness the full degrees of freedom (DOFs) of light for efficient data transmission, their waveguide nature inherently constrains two-dimensional spatial scaling to accommodate a large number of optical signals in parallel. Here we present a scalable optical receiver platform that fully exploits the high spatial parallelism and ultrabroad bandwidth of light, while leveraging all DOFs—intensity, phase, and polarization. Our solution integrates a thin metasurface, composed of silicon nanoposts, with ultrafast membrane photodetectors on a compact chip. The metasurface provides all the functionalities of conventional PICs for normal-incident spatially parallelized light, enabling high-speed detection of optical signals in various modulation formats, including simultaneous detection of 320-gigabit-per-second four-channel four-level pulse amplitude modulation (PAM4) signals and coherent detection of 240-gigabit-per-second 64-ary quadrature amplitude modulation (64QAM) signals.
