We demonstrated a novel depth sensing system that utilizes metasurfaces and photonic crystal surface-emitting lasers (PCSELs), realizing structured light generation and facial recognition in monocular depth sensing. Our single-shot system projects approximately 10,000 infrared spots from a 300^2 μm^2 metasurface area, which is 233 times smaller than the commercial DOE-based dot projector used in the Face ID on iPhone. The system is lens-free and power consumption due to the utilization of PCSEL, reducing 5-10 times of power compared to VCSEL-array based dot projectors.
We present a novel depth sensing system applying metasurface holograms and photonic crystal surface-emitting lasers (PCSELs). Our lens-free, single-shot system projects 9,500 infrared dots in a 0th order of holographic image from a compact ~3002 μm2 sample area, offering a wide 56.7° field-of-view (FOV) with low power consumption. Our metasurface area is 55 times smaller than that of diffractive optical elements (DOEs) in commercial dot projectors. And our PCSEL has up to 10 times less power consumption than that of vertical-cavity surface-emitting laser (VCSEL) array in commercial dot projectors. The GaAs-based metasurface hologram and simple optical architecture make it lighter and more energy-efficient, suitable for wearable devices. This technology overcomes limitations of bulky dot projectors, paving the way for integration into compact wearable devices.
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