基于多层石墨烯-黑磷结构可调谐各向异性吸收器

Tunable Anisotropic Absorber Based on Multilayer Graphene-Black Phosphorus Structure

摘要:

基于阻抗匹配理论(IMT)和多层局域表面等离子体共振(LSPR)耦合效应,设计了一种多层石墨烯-黑磷可调谐各向异性吸收器。通过采用时域有限差分法(FDTD)进行模拟仿真计算分析发现,TE偏振下,吸收器在波长20.8~45.34μm范围内可实现94%的宽带平均吸收；TM偏振下,在波长16.6~44.6μm范围内可以实现96.3%的宽带平均吸收,呈现出一定程度的各向异性吸收特性。此外,通过调整石墨烯-黑磷块的宽度,可以调节吸收带宽。同时,动态调节石墨烯的费米能级或黑磷的电子掺杂浓度也能够调节吸收带宽和平均吸收率。该研究成果对动态可调谐红外能量采集、偏振选择性吸收和红外伪装领域具有理论指导意义。

Abstract:

Based on impedance matching theory and the multilayer local surface plasmon resonance coupling effect, we designed a multilayer graphene-black phosphorus tunable anisotropic absorber. We used the finite-difference time-domain method to simulate and analyze the results. Under TE polarization, we achieved an average broadband absorption of 94% in the wavelength range of 20.8~45.34μm. Under TM polarization, we achieved an average broadband absorption of 96.3% in the wavelength range of 16.6~44.6μm, thus indicating a certain degree of anisotropic absorption. In addition, the absorption bandwidth can be altered by adjusting the width of the graphene-black phosphorus block. Simultaneously, dynamically adjusting the Fermi level of graphene or the electron-doping concentration of black phosphorus can alter the absorption bandwidth and average absorption rate. The results of this study are theoretically significant in the fields of dynamic tunable infrared-energy acquisition, polarization-selective absorption, and infrared camouflage.