A universal 3D imaging sensor on a silicon photonics platform

Abstract

Accurate 3D imaging is essential for machines to map and interact with the physical world. While numerous 3D imaging technologies exist, each addressing niche applications with varying degrees of success, none have achieved the breadth of applicability and impact that digital image sensors have achieved in the 2D imaging world. A large-scale two-dimensional array of coherent detector pixels operating as a light detection and ranging (LiDAR) system could serve as a universal 3D imaging platform. Such a system would offer high depth accuracy and immunity to interference from sunlight, as well as the ability to directly measure the velocity of moving objects. However, due to difficulties in providing electrical and photonic connections to every pixel, previous systems have been restricted to fewer than 20 pixels. Here, we demonstrate the first large-scale coherent detector array consisting of 512 ($32\times 16$) pixels, and its operation in a 3D imaging system. Leveraging recent advances in the monolithic integration of photonic and electronic circuits, a dense array of optical heterodyne detectors is combined with an integrated electronic readout architecture, enabling straightforward scaling to arbitrarily large arrays. Meanwhile, two-axis solid-state beam steering eliminates any tradeoff between field of view and range. Operating at the quantum noise limit, our system achieves an accuracy of $3.1\mathrm{mm}$ at a distance of 75 metres using only $4\mathrm{mW}$ of light, an order of magnitude more accurate than existing solid-state systems at such ranges. Future reductions of pixel size using state-of-the-art components could yield resolutions in excess of 20 megapixels for arrays the size of a consumer camera sensor. This result paves the way for the development and proliferation of low cost, compact, and high performance 3D imaging cameras.

18 pages, 9 figures

References in corpus (4)

• Deep Learning with Coherent Nanophotonic Circuits
• Massively parallel coherent laser ranging using soliton microcombs
• Efficient, Compact and Low Loss Thermo-Optic Phase Shifter in Silicon
• Squeezing the Local Oscillator Does Not Improve Signal-to-Noise Ratio in Heterodyne Laser Radar

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• Generating free-space structured light with programmable integrated photonics
• Integrated Metasurfaces on Silicon Photonics for Emission Shaping and Holographic Projection
• Parallelized computational 3D video microscopy of freely moving organisms at multiple gigapixels per second
• Quantum and Non-local Effects Offer LiDAR over 40dB Advantage
• Broadband behavior of quadratic metalenses with a wide field of view
• A microcomb-empowered Fourier domain mode-locked LiDAR
• Ultra-broadband surface-normal coherent optical receiver with nanometallic polarizers
• Machine-Learning-Assisted Photonic Device Development: A Multiscale Approach from Theory to Characterization
• Ultrafast one-chip optical receiver with functional metasurface
• Inert gas as electronic impurity in semiconductors: The case for active infrared absorption in silicon
• Linear and Nonlinear Characterization of broadband integrated Si-rich silicon nitride racetrack ring resonator for on-chip applications
• Passive silicon nitride integrated photonics for spatial intensity and phase sensing of visible light
• Identity-enabled CDMA LiDAR for massively parallel ranging with a single-element receiver