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Triple-band black-phosphorus-based absorption using critical coupling.

Yanli Xu, Hongxu Li, Xin Zhang

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    |October 26, 2020
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    Summary

    A novel triple-band black phosphorus (BP) absorber was developed using a unique rectangular structure. This design achieves high absorption across multiple mid-infrared wavelengths, showing promise for advanced photoelectric devices.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nanotechnology

    Background:

    • Black phosphorus (BP) is a key two-dimensional material for next-generation photoelectric devices.
    • Developing efficient absorbers is crucial for various optoelectronic applications.

    Purpose of the Study:

    • To propose and investigate a novel triple-band absorber based on monolayer black phosphorus coupled with a missing angle rectangular structure.
    • To explore the tunability and polarization-dependent characteristics of the proposed BP absorber.

    Main Methods:

    • Numerical simulation of a monolayer black phosphorus structure coupled with a missing angle rectangular unit.
    • Analysis of absorption spectra under TM polarization at specific mid-infrared wavelengths.
    • Investigation of tunability via electron doping, geometric parameters, and substrate refractive index.

    Main Results:

    • Achieved high absorption peaks of 95.45% at 2901.76 nm, 98.68% at 3810.71 nm, and 98.06% at 4676.97 nm.
    • Demonstrated flexible control over absorption peaks and resonance wavelengths through doping, structural geometry, and substrate properties.
    • Observed polarization-dependent absorption due to the inherent anisotropy of black phosphorus.

    Conclusions:

    • The proposed missing angle rectangular structure effectively creates a triple-band BP absorber with high efficiency.
    • The design offers tunable absorption characteristics, making it adaptable for various mid-infrared applications.
    • This work presents a promising platform for designing advanced photodetectors, modulators, and optical switches.