4.7 Article

Double-wavelength coherent perfect absorption laser in Thue-Morse PT-symmetric photonic crystals

期刊

RESULTS IN PHYSICS
卷 39, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.rinp.2022.105746

关键词

Coherent perfect absorption; Laser points; Double-wavelength; PT-symmetry; Thue-Morse sequence; Photonic crystal

资金

  1. Science and Technology Program of Hubei Province, China [2019BEC206]
  2. Major Development Program of Hubei Province, China [2020BGC028, 2021BGD022]
  3. Special Project on the Large Corridor for Scientific and Technological Innovation of Guanggu, China [2021BGE030]

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Coherent perfect absorption laser points (CPA-LPs) are investigated in Thue-Morse (Th-M) PT-symmetric photonic crystals. The operating wavelengths of CPA-LPs are dependent on the Th-M sequence number, incident angle, and gain-loss factor of materials, supporting double-wavelength lasers. This study is helpful for potential applications in lasers and highly sensitive sensors.
Coherent perfect absorption laser points (CPA-LPs) are investigated in the Thue-Morse (Th-M) PT-symmetric photonic crystals. CPA-LPs are induced as incident light impinges perpendicularly upon the structure. The operating wavelengths of the CPA-LPs are dependent on the Th-M sequence number, the incident angle and the gain-loss factor of materials. Especially, two CPA-LPs may be achieved with the same value of incident angle for a specific gain-loss factor. Double-wavelength laser consequently is supported in this structure and the corresponding transmittance of the CPA-LPs is optional. An abrupt jump in the calculated reflection coefficient phase could be found at the CPA-LPs as well. This study may be helpful in potential applications for lasers and highly sensitive sensors.

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