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Coherent perfect absorption and laser modes in a cylindrical structure of conjugate metamaterials

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Title Coherent perfect absorption and laser modes in a cylindrical structure of conjugate metamaterials
Title of Series New Journal of Physics, Volume 20, 2018
Author Fu, Yangyang
Xu, Yadong
Chen, Huanyang
Cummer, Steven A.
License CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/38886
Publisher Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG)
Release Date 2018
Language English

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Subject Area Physics
Abstract In this work, we theoretically find that coherent perfect absorption (CPA) and laser modes can be realized in a two-dimensional cylindrical structure composed of conjugate metamaterials (CMs). The required phase factors of CMs for achieving CPA and laser modes are determined by the geometric size of the CM cylinder, which is a unique feature compared with other non-Hermitian optical systems. Based on this property, we also demonstrate that CPA and laser modes can exist simultaneously in a CM cylinder with an extremely large size, where the excitations of CPA and laser modes depend on the angular momentum of coherent incident light. Therefore, compared with the well known parity time symmetry, our work opens up a brand-new path to obtaining CPA and laser modes, and is a significant advance in non-Hermitian optical systems.

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