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Adjoint Algorithm Design of Selective Mode Reflecting Metastructure for BAL Applications.

Zean Li1,2, Xunyu Zhang1,2, Cheng Qiu1,3

  • 1State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

Nanomaterials (Basel, Switzerland)
|May 10, 2024
PubMed
Summary
This summary is machine-generated.

We developed a novel metasurface waveguide for broad-area lasers (BALs) to improve beam quality. This structure acts as a mode-selective back-reflector, significantly enhancing fundamental mode reflection while suppressing unwanted modes.

Keywords:
adjoint algorithmbroad-area laserinverse designlarge scalemode selection

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Metamaterials

Background:

  • Broad-area lasers (BALs) offer high power but suffer from poor spatial beam quality due to multi-mode operation.
  • Improving beam quality in BALs is critical for numerous high-power applications.

Purpose of the Study:

  • To propose and design a novel metasurface waveguide structure for transverse mode selection in BALs.
  • To enhance the fundamental mode reflection and suppress higher-order modes in BALs.

Main Methods:

  • Utilized a digital adjoint algorithm for inverse design of the metasurface waveguide structure.
  • Investigated a device with a 40 × 20 μm² design area.
  • Performed simulations to evaluate mode selectivity and reflection characteristics.

Main Results:

  • Achieved high fundamental mode reflection exceeding 90%.
  • Suppressed higher-order transverse mode reflections to below 0.2%.
  • Demonstrated the largest device structure designed using inverse methods to date.

Conclusions:

  • The proposed metasurface waveguide effectively acts as a transverse mode selective back-reflector for BALs.
  • The digital adjoint algorithm is suitable for designing large-area, high-degree-of-freedom photonic structures.
  • The designed device exhibits robustness and feasibility for practical applications.