Fig. 1: Schematic diagrams of dual-mode 3D detection using tunable hybrid cascaded metasurfaces (THCMs).
From: A dual-mode LiDAR system enabled by mechanically tunable hybrid cascaded metasurfaces
a Schematic of beam scanning in beam array scanning mode. Left-Circularly Polarized (LCP) light passes THCMs to project a beam array. Beam scanning can be achieved by controlling the translation between the input metasurface I (MS I) and the output metasurface II (MS II). b Schematic of beam projection in flash illuminating mode. Right-Circularly Polarized (RCP) light passes through THCMs to achieve large-field-of-view uniform illumination. c Simplified optical path diagram. The beam forming device consists of the THCMs and a micro-actuator. The LCP and RCP incidence switching is achieved by controlling the angle of the Quarter-wave plate. d Exploded view of the beam forming device. The micro-actuator, based on shape memory alloy (SMA), controls the in-plane displacement of MS II to enable beam scanning
