4.6 Article

Dynamically tunable coherent perfect absorption in topological insulators at oblique incidence

Journal

OPTICS EXPRESS
Volume 29, Issue 18, Pages 28652-28663

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OE.435440

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Funding

  1. National Natural Science Foundation of China [61875025]
  2. Natural Science Foundation of Chongqing [cstc2020jcyj-jqX0015]
  3. Graduate Research and Innovation Foundation of Chongqing, China [CYB20059]
  4. Chongqing Talent Plan for Young TopNotch Talents [CQYC201905010]
  5. Chongqing Natural Science Foundation of Innovative Research Groups [cstc2020jcyj-cxttX0005]
  6. Fundamental Research Funds for the Central Universities [2018CDQYGD0022, cqu2018CDHB1B03]
  7. Visiting Scholar Foundation of Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, China

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By utilizing dynamically tunable coherent perfect absorption in a topological insulator, it is possible to manipulate light absorption effectively and achieve high modulation within a wide absorption range. This versatile platform offers potential applications in next-generation coherent detectors, modulators, switches, and processors.
The effective engineering of light absorption has been the focus of intensive research to realize the novel optoelectronic devices based on a topological insulator, a unique topologically protected surface Dirac-state quantum material with excellent prospects in electronics and photonics. Here, we theoretically proposed a versatile platform for manipulating the light-matter interaction employing the dynamically tunable coherent perfect absorption (CPA) in the topological insulator Bi1.5Sb0.5Te1.8Se1.2(BSTS). By simply varying the phase difference between two coherent counter-propagating beams, the BSTS-based CPA device can be continuously switched from the high transparency state to the strong absorption state, leading to the modulation of absorption ranging from 0.2% to 99.998%. Under the illumination of TE-polarized wave, the high absorption (>90%) can be implemented within a broad range from 0.47 to 1.51 mu m through a proper incident angle alteration. In addition, the quasi-CPA wavelength can be flexibly selected by tuning the bulk thickness of BSTS film while maintaining high modulation depth of 10(4). Such BSTS-based CPA device with flexible tunability, wide absorption modulation range, and high modulation depth is expected to be utilized in a wide range of potential applications such as in next-generation coherent detectors, coherent modulators, all-optical switches, and signal processors. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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