期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 35, 期 4, 页码 175-178出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2022.3228853
关键词
Thermal-electric tunability; graphene; high-quality factor; guided-mode resonance; perfect absorber
We propose a thermally-electrically tunable perfect absorber based on amorphous silicon (a-Si) and graphene, which can achieve narrow bandwidth perfect absorption due to guided-mode resonance. The resonance wavelength can be thermally tuned with high efficiency and linear controllability through Joule heating, thanks to the linear relationship between refractive index of a-Si and temperature. Additionally, by adjusting the gate voltage, the chemical potential of graphene can be electrically modified, enabling a rapid switching of perfect absorption and perfect reflection. The proposed absorber features a simple structure, perfect absorption, and efficient thermal-electric tunability, showing great potential in applications such as modulators, optical switches, and selective filters.
We propose a thermally-electrically tunable perfect absorber based on amorphous silicon (a-Si) and graphene. Numerical results reveal that a perfect absorption with narrow bandwidth can be induced owing to the guided-mode resonance. The thermal tuning of resonant wavelength, realized via the Joule heating, characters a high tuning efficiency and a linear controllability. The linear and thermal tunability is attributed to the linear relationship between refractive index of a-Si and temperature. Moreover, by adjusting the applied gate voltage, the chemical potential of graphene can be electrically modified, leading to a change of optical absorption and enabling 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.
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