期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 54, 期 43, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ac1763
关键词
coherent perfect absorption; metasurface; dynamically tunable
资金
- National Natural Science Foundation of China [61505052, 61775055, 11904096]
- Natural Science Foundation of Hunan Province, China [2020JJ5028]
The composite metasurface made of InSb strips and SiO2 substrate achieves multi-band coherent perfect absorption in the terahertz frequency range. By controlling the relative phase or intensity, absorption at each resonance frequency can be independently modulated. The design also exhibits thermal tunability and sensitivity to refractive index, making it suitable for sensing applications in the terahertz band.
We propose a composite metasurface composed of InSb strips and SiO2 substrate, which can achieve multi-band coherent perfect absorption in the terahertz frequency range. It is demonstrated that InSb strips of different sizes support independent plasmon resonances at different frequencies, which is a linear superposition of each subunit. The absorption at each resonance frequency can be independently and continuously modulated with the modulation depth is up to 1.332 x 10(4) via controlling the relative phase or relative intensity of two beams. Meanwhile, the absorber has the sensitivity of the refractive index to the surrounding environment, thereby facilitating the design of sensing devices. Moreover, it has excellent thermal tunability: we flexibly modulate absorption via controlling the temperature without restructuring. Our design contributes a feasible way of manipulating the interaction between light and matter, which can be applied to the field of micro-nano photonic devices in the terahertz band.
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