Opt Lett. 2023 Feb 1;48(3):783-786. doi: 10.1364/OL.476387.
Bianisotropic media can be used to engineer absorbance, scattering, polarization, and dispersion of electromagnetic waves. However, the demonstration of a tunable light-induced bianisotropy at optical frequencies is still lacking. Here, we propose an experimentally feasible concept for a light-induced tunable bianisotropic response in a homogeneous sphere made of an epsilon-near-zero (ENZ) material. By exploiting the large linear absorption and the large possible intensity-dependent changes in the permittivity of ENZ materials, the direction-dependent scattering and absorption cross sections could be obtained. Our findings pave the way for further studies and applications in the optical regime requiring full dynamic control of the bianisotropic behavior.
双各向异性媒质可用于设计电磁波的吸收率、散射率、偏振度和色散率。然而，在光学频率下演示可调谐光致双各向异性仍然缺乏。在这里，我们提出了一种在由近零介电常数（ENZ）材料制成的均匀球体中实现光诱导可调谐双各向异性响应的实验可行概念。通过利用 ENZ 材料的大线性吸收和可能的大强度相关介电常数变化，可以获得方向相关的散射和吸收截面。我们的发现为在需要对双各向异性行为进行完全动态控制的光学波段的进一步研究和应用铺平了道路。
