红外, 2011, 32 (3): 1, 网络出版: 2011-04-28
太赫兹波段可调窄带滤波器
A Tunable Narrowband Terahertz Filter
摘要
提出了一种基于FDTD模拟的亚波长阵列结构的太赫兹波段可调窄带滤波器,其结构尺寸由16m 至160m可调,因此可以实现滤波频率在2.5 THz~20 THz大范围内的调节,最小带宽达到0.04THz,实现了非常好的 窄带滤波效应。此外,这种人工复合结构还可以通过改变其与太赫兹偏振夹角的方式改变太赫兹波偏振态,同时实现窄带滤 波和偏振两种调制。该结构比以往结构更简单,便于实现和操作。因此在太赫兹成像系统中使用这种结构,可以有效提高系统 的分辨率,对于今后的太赫兹成像研究具有重要的意义。
Abstract
A tunable narrowband THz filter with a sub-wavelength array structure based on FDTD simulation is presented. Since the array structure is adjustable in the size range of 16m to 160m, its filtering frequency can be tunable in a wide range of 2.5THz to 20THz with a minimum bandwidth down to 0.04THz. With this filter, excellent narrowband filtering is achieved. In addition, the structure can change the THz wave polarization by changing the angle between itself and the THz wave. So it can achieve both narrowband filtering and polarization. Compared with the traditional structures, this structure has the features of simplicity and easy operation. It can improve the resolution of THz imaging systems and is of significance to the future research on THz imaging.
赵冬梅, 周庆莉, 李磊, 施宇蕾, 张存林. 太赫兹波段可调窄带滤波器[J]. 红外, 2011, 32(3): 1. ZHAO Dong-mei, ZHOU Qing-li, LI Lei, SHI Yu-lei, ZHANG Cun-lin. A Tunable Narrowband Terahertz Filter[J]. INFRARED, 2011, 32(3): 1.