基于光敏半导体材料电导率可被外部泵浦光调控的特性,通过在嵌套的类方环单元结构中嵌入半导体材料砷化镓,设计了一种动态光控单频/双频可切换的超材料吸收器。在此基础上,根据不同波长的泵浦光对不同半导体材料的激发特性,引入第二种半导体材料锗,将第一种结构进行拓展,提出了一种光可控的多频段超材料吸收器,利用不同波长的泵浦光调控半导体材料的电导率,实现了单频/双频/三频吸收状态任意切换的吸收特性。仿真结果表明,所设计的吸收器具有偏振不敏感和宽角度入射的特性,有望在调制器、频率选择器、探测器等领域得到应用。

Based on the characteristic that the conductivity of photosensitive semiconductor material can be controlled by external pump light, a dynamic optical-controlled single-/dual-band switchable metamaterial absorber is designed by embedding the semiconductor material of gallium arsenide into the nested square ring-like cell structure. On this basis, according to the different excitation characteristics of different semiconductor materials pumped by light with different wavelengths, the first structure is expanded by introducing the second semiconductor material of germanium, and an optical-controlled multi-band metamaterial absorber is proposed. The proposed absorber possesses the absorption characteristic of arbitrary switch among the single-/dual-/triple-band absorption states by using pump light with different wavelengths to tune the conductivities of the semiconductors. The simulation results show that the proposed absorber has the characteristics of insensitive polarization and wide-angle incidence, which is expected to be applied in modulators, frequency selectors, detectors, and so on.