MOE-based optics for FMCW LiDAR

Original (Chinese)

Optical sensing apparatus includes a transmitter, which emits frequency-modulated (FM) coherent optical radiation along a transmit axis toward a target, and a receiver, which is disposed alongside the transmitter and comprises an array of detectors. An objective optic focuses the optical radiation that is reflected from the target onto the receiver along a receive axis. A transparent slab, disposed over the transmitter and receiver, includes a diffractive surface, which deflects a part of the FM coherent optical radiation to form a local beam propagating diagonally within the transparent slab and reflecting from within the slab toward the receive axis. A collimating metasurface on the slab, intercepting the receive axis, deflects and collimates the reflected local beam onto the array of detectors, whereby the local beam mixes at the array with the optical radiation reflected from the target.