Silicon Ribbon-Based Dual-Beam Optical Phased Array with Low Crosstalk and Large FoV

Hsun Yuan Chi, Wei Hong, Hsuan Lai, Shih Hsiang Hsu, Che Chang Chang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this paper, a silicon ribbon (SR)-based microstructure is developed and added to a 32-channel optical phased array (OPA) to reduce the crosstalk between the antennas of grating waveguides. The spacing between the chirped grating antennas can be as close as 600 nm to effectively improve the field of view (FoV) of the OPA in the horizontal direction to 95 degrees. This SR-based approach substantially reduces the side lobe by 10 dB, effectively suppressing the noise and increasing the main lobe by 6 dB and considerably expanding the grating length with linear energy decay. The full width at the half maximum of the light spot reaches about 0.24 degrees. The antenna sites can simultaneously be scanned vertically by bi-directional inputs, effectively increasing the FoV to 30 degrees in the vertical direction.

Original languageEnglish
Article number505
JournalApplied Sciences (Switzerland)
Issue number1
Publication statusPublished - Jan 1 2022


  • LiDAR
  • Optical phased array
  • Waveguide

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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