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Parity-time-symmetric circular Bragg lasers: a proposal and analysis.

Jiahua Gu1,2, Xiang Xi1, Jingwen Ma1,2

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.

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|November 29, 2016
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Summary

We introduce novel parity-time-symmetric semiconductor lasers using circular Bragg gratings. These lasers offer lower thresholds and better single-mode performance for high-power applications.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Physics

Background:

  • Conventional semiconductor lasers often struggle with mode-hop-free, high-power, single-mode operation.
  • Distributed-feedback lasers typically modulate only the real refractive index.

Purpose of the Study:

  • To propose and analyze a new semiconductor laser design based on parity-time symmetry.
  • To investigate the advantages of this design for high-performance laser applications.

Main Methods:

  • Implementing parity-time symmetry in a two-dimensional circular Bragg grating structure.
  • Modulating both real and imaginary parts of the refractive index radially.
  • Analyzing laser modal properties using a transfer-matrix method.
  • Verifying the design through numerical simulations.

Main Results:

  • The proposed parity-time-symmetric circular Bragg lasers exhibit reduced threshold.
  • Enhanced modal discrimination is achieved compared to conventional lasers.
  • The design offers intrinsic circular symmetry and a large emission aperture.

Conclusions:

  • Parity-time-symmetric circular Bragg lasers present significant advantages for mode-hop-free, high-power, single-mode operation.
  • This novel laser design is promising for demanding laser applications.