标题： 太赫兹光可调谐介电超材料无需微加工 显示英文标题

标题： Terahertz optically tunable dielectric metamaterials without microfabrication

摘要： 我们理论上研究了承载红外光致光栅的半导体板的太赫兹介电响应。 周期性结构是由于两个倾斜的红外平面波的干涉引起的电荷载流子光激发，因此可以通过改变光束强度和入射角分别调节光栅深度和周期。 在光栅周期远小于太赫兹波长的情况下，我们通过借助与红外辐射激发的电荷载流子动力学耦合的电磁全波仿真，数值评估了有效介电张量的寻常分量和非常分量。 我们表明，通过改变光栅可以定制光致超材料的光学响应，其范围从双折射到超棱镜到各向异性负介电，而无需借助微加工技术。 显示英文摘要

摘要： We theoretically investigate the terahertz dielectric response of a semiconductor slab hosting an infrared photoinduced grating. The periodic structure is due to the charge carries photo-excited by the interference of two tilted infrared plane waves so that the grating depth and period can be tuned by modifying the beam intensities and incidence angles, respectively. In the case where the grating period is much smaller than the terahertz wavelength, we numerically evaluate the ordinary and extraordinary component of the effective permittivity tensor by resorting to electromagnetic full-wave simulation coupled to the dynamics of charge carries excited by infrared radiation. We show that the photoinduced metamaterial optical response can be tailored by varying the grating and it ranges from birefringent to hyperbolic to anisotropic negative dielectric without resorting to microfabrication.