Depth sensing with metasurface and PCSEL integration

Wen Cheng Hsu, Chia Hsun Chang, Yu Heng Hong, Hao Chung Kuo, Yao Wei Huang*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationDesign, Materials, Fabrication, Characterization, and Applications XXI
EditorsTakuo Tanaka, Yu-Jung Lu
ISBN (Electronic)9781510665101
StatePublished - 2023
EventPlasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI 2023 - San Diego, United States
Duration: 20 Aug 202324 Aug 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferencePlasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI 2023
Country/TerritoryUnited States
CitySan Diego


  • depth sensing
  • hologram
  • metasurfaces
  • photonic crystal surface emitting laser
  • structured light


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