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Virtually imaged phased-array-based 2D nonmechanical beam-steering device for FMCW LiDAR.

Zhi Li, Zihan Zang, H Y Fu

    Applied Optics
    |March 10, 2021
    PubMed
    Summary
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    This study introduces a novel 2D nonmechanical beam-steering device using a virtually imaged phased array (VIPA) for frequency-modulated continuous-wave (FMCW) LiDAR. This innovation enables simultaneous 2D beam steering and high-resolution ranging via wavelength tuning.

    Area of Science:

    • Optics and Photonics
    • LiDAR Technology
    • Optical Engineering

    Background:

    • Nonmechanical beam-steering is crucial for advancing LiDAR systems, offering advantages in speed, size, and reliability over traditional mechanical methods.
    • Existing LiDAR technologies often face limitations in beam-steering speed and compactness.
    • Frequency-modulated continuous-wave (FMCW) LiDAR offers high-resolution ranging capabilities.

    Purpose of the Study:

    • To propose and detail a novel 2D nonmechanical beam-steering device for FMCW LiDAR applications.
    • To demonstrate the simultaneous achievement of 2D beam steering and high-resolution ranging using wavelength tuning.
    • To simplify the design of VIPA-based 2D dispersers and establish a feasible design procedure.

    Main Methods:

    • Development of a 2D nonmechanical beam-steering device utilizing a virtually imaged phased array (VIPA).

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  • Integration of wavelength tuning for simultaneous 2D beam steering and FMCW ranging.
  • Application of approximation techniques to simplify VIPA-based 2D disperser design formulas.
  • Proposal of a novel, feasible design procedure for the VIPA device.

    • Main Results:

    • Successful demonstration of a VIPA-based 2D nonmechanical beam-steering device.
    • Simultaneous 2D beam steering and high-resolution FMCW ranging achieved through wavelength tuning.
    • Simplified design formulas and a practical design procedure for VIPA dispersers presented.
    • Exhibition of several design examples with varied optimal properties.

    Conclusions:

    • The proposed VIPA-based device offers a promising solution for fast, compact, and reliable nonmechanical beam steering in FMCW LiDAR.
    • The simplified design approach facilitates the practical implementation of advanced LiDAR systems.
    • This work represents a significant step towards realizing high-performance, nonmechanical LiDAR systems.