以超穎介面和光子晶體面射型雷射的結構光實現單眼深度感知和臉部識別
這裡介紹的新型深度感測系統透過採用超穎介面和光子晶體面射型雷射在單眼深度感測中實現高效的臉部識別，徹底改變了結構光技術。與依賴繞射光學元件和準直透鏡的傳統點投影儀不同，我們的系統從三百微米尺寸的超穎介面投射約四萬五千個紅外線點，比商用基於繞射光學元件的點陣投影儀更多（1.43 倍）且尺寸更小（233 倍）。此系統的測量視場為 158°，點採樣角為 0.611°，無透鏡且重量輕，且功耗比垂直腔表面發射雷射陣列更低，功率降低 5−10 倍。 這項創新利用基於砷化鎵基板的超穎介面和簡化的光學架構，不僅解決了傳統點陣投影儀的缺點，而且還為微型化整合至可穿戴設備中開闢了途徑，在尺寸、功效和廣泛採用的潛力方面提供了顯著的優勢。
關鍵字：超穎介面、光子晶體面射型雷射、結構光、深度感測
本文刊登於 光學工程 (Lidar 光達特輯) 162, 14-22 (2024) - LINK & PDF
Metasurface- and PCSEL-Based Structured Light for Monocular Depth Perception and Facial Recognition
The novel depth-sensing system presented here revolutionizes structured light (SL) technology by employing metasurfaces and photonic crystal surface-emitting lasers (PCSELs) for efficient facial recognition in monocular depth sensing. Unlike conventional dot projectors relying on diffractive optical elements (DOEs) and collimators, our system projects approximately 45,700 infrared dots from a compact 297-μm-dimension metasurface, drastically generate more spots (1.43 times) and has smaller area (233 times) than the DOE-based dot projector in an iPhone. With a measured field-of-view (FOV) of 158° and a 0.611° dot sampling angle, the system is lens-free and lightweight and boasts lower power consumption than vertical-cavity surface emitting laser (VCSEL) arrays, resulting in a 5−10 times reduction in power. Utilizing a GaAs-based metasurface and a simplified optical architecture, this innovation not only addresses the drawbacks of traditional SL depth sensing but also opens avenues for compact integration into wearable devices, offering remarkable advantages in size, power efficiency, and potential for widespread adoption.
Keywords: metasurfaces, photonic crystal surface-emitting laser, structured light, depth sensing
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