Abstract

We have developed a nonmechanical beam scanner equipped with a Si photonics slow-light grating toward an on-chip frequency-modulated continuous-wave light detection and ranging (FMCW LIDAR) device. An optical beam is scanned thermo-optically, but it is also shifted sensitively to the frequency modulation, which is inconvenient for FMCW LIDAR. In this study, we canceled this shift and obtained step-like beam scanning with synchronized thermo-optic signals, which was confirmed in space–time-domain beam observations. The step-like scanning allows finer angular resolution of the range profile.

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Solid-state FMCW LiDAR with in-fiber beam scanner

Zhi Li, Bonan Liu, Chang Rui Liao, and H. Y. Fu
Opt. Lett. 47(3) 469-472 (2022)

Space-time-domain observation of high-speed optical beam scanning in a thermo-optic Si photonic crystal slow-light beam scanner

Jun Gondo, Hiroyuki Ito, Takemasa Tamanuki, and Toshihiko Baba
Opt. Lett. 46(15) 3600-3603 (2021)

Doppler velocimeter and vibrometer FMCW LiDAR with Si photonic crystal beam scanner

Saneyuki Suyama, Hiroyuki Ito, Ryo Kurahashi, Hiroshi Abe, and Toshihiko Baba
Opt. Express 29(19) 30727-30734 (2021)

Ambient light immunity of a frequency-modulated continuous-wave (FMCW) LiDAR chip

Mikiya Kamata, Takemasa Tamanuki, Riku Kubota, and Toshihiko Baba
Opt. Express 32(3) 3997-4012 (2024)

High-efficiency upward radiation in a slow-light grating beam scanner

Saneyuki Suyama and Toshihiko Baba
Opt. Express 31(13) 22170-22178 (2023)