Deep subwavelength manipulation of terahertz (THz) wave is a key method to realize compact on chip THz devices. It is demonstrated that the refractive index change in a deep subwavelength region of a dielectric layer can effectively manipulate the surface THz wave propagation by the simulation study. The feature size of this area is only 10 μ m (∼1/8 λ ). A slight change of refractive index, position or size of this region is enough to manipulate the surface THz waves with high efficiency, such as the transmissivity or reflectivity of different THz frequencies. Moreover, the change of the deep subwavelength region can be controlled by an ultrafast laser to achieve ultrafast dynamic manipulation of THz waves. This is a concise and efficient method of manipulating electromagnetic waves on the deep subwavelength scale and to fabricate more compact integrated optical devices.

中文翻译：

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等离子体表面对太赫兹波的深亚波长操纵

太赫兹（THz）波的深亚波长操纵是实现紧凑的片上THz器件的关键方法。仿真研究表明，介电层深亚波长区域的折射率变化可以有效地控制表面太赫兹波的传播。该区域的特征尺寸仅为10μm（〜1/8λ）。该区域的折射率，位置或大小的微小变化足以有效地操纵表面THz波，例如不同THz频率的透射率或反射率。此外，可以通过超快激光控制深亚波长区域的变化，以实现THz波的超快动态操纵。