Thermally-electrically tunable graphene-based guided-mode resonant perfect absorber

We propose a thermally-electrically tunable perfect absorber based on graphene and amorphous silicon. Numerical results reveal that a perfect absorption with narrow bandwidth can be induced owing to critical coupling with guided-mode resonance. The thermal tuning of resonant wavelength is realized v...

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Bibliographic Details
Published in:IEEE photonics technology letters 2023-02, Vol.35 (4), p.1-1
Main Authors: Huang, Ze-Tao, Jiang, Hao-Yi, Wang, Zi-Ye, Qing, Ye-Ming, Li, Bing-Xiang
Format: Article
Language:English
Subjects:
Absorbers
Absorption
Amorphous silicon
Chemical potential
Couplings
Graphene
guided-mode resonance
high-quality factor
Ohmic dissipation
Optical polarization
Optical refraction
Optical switching
Optical variables control
perfect absorber
Refractivity
Resistance heating
Structural engineering
Thermal-electric tunability
Tuning
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Summary:We propose a thermally-electrically tunable perfect absorber based on graphene and amorphous silicon. Numerical results reveal that a perfect absorption with narrow bandwidth can be induced owing to critical coupling with guided-mode resonance. The thermal tuning of resonant wavelength is realized via the electrically controlled Joule heating with a high tuning efficiency and linear controllability due to the linear relationship between the refractive index of amorphous silicon and the variation of temperature. Moreover, by adjusting the applied gate voltage, the chemical potential of graphene can be electrically modified and lead to a change of optical absorption, henceforth implementing a rapid switching of perfect-absorption and perfect-reflection. It is remarkable that the proposed absorber features a simple structure, perfect absorption, and efficient thermal-electric tunability, manifesting tremendous potential applications in modulator, optical switching, selective filter, etc.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2022.3228853