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Quadruple-band anisotropic perfect absorption and terahertz sensing in monolayer black phosphorus with flower-like air hole

Y. PAN1,*

Affiliation

  1. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China

Abstract

We design and study a multi-band anisotropic black phosphorus (BP) based absorber. The proposed absorber is consisting of a monolayer black phosphorus, a crystalline silicon layer, and a gold substrate. Numerical results show that the absorber has four absorption peaks both close to perfect absorption, generated by critical coupling. Absorption can be adjusted by varying key parameters, such as semi-major axis, short-half axis, height, period, and the polarization angle. The sensitivity S of peak 1, peak 2, peak 3, and peak 4 are about 0.85 THz/RIU, 0.875 THz/RIU, 1.15 THz/RIU, and 1.05 THz/RIU, respectively. As well, the FOMs corresponding to resonance peak 1, peak 2, peak 3, and peak 4 are about 8.10 RIU-1, 21.88 RIU-1, 9.35 RIU-1, and 20.25 RIU-1, respectively. The proposed BP-based quadruple-band absorber provides a basis for designing borophene-based sensor and other electronic-photonics devices..

Keywords

Black phosphorus, Critical coupling, Perfect plasmonic absorber.

Submitted at: Sept. 15, 2023
Accepted at: April 10, 2024

Citation

Y. PAN, Quadruple-band anisotropic perfect absorption and terahertz sensing in monolayer black phosphorus with flower-like air hole, Journal of Optoelectronics and Advanced Materials Vol. 26, Iss. 3-4, pp. 91-100 (2024)