利用3D打印技术制备太赫兹器件

高性能的太赫兹器件在控制太赫兹波方面起到重要的作用,因此寻求一种简单有效的太赫兹器件加工方案非常必要。本文以太赫兹波导和太赫兹滤波器为例,分别选用Kagome型光子晶体结构的波导和一维光子晶体结构的滤波器,运用商用的3D打印机加工样品,并采用透射式太赫兹时域光谱系统对样品的参数进行测量。实验结果表明:加工的波导在0.2~1.0 THz范围内传输损耗平均值约为0.02 cm~(-1),最小值可达到0.002 cm~(-1),且可运用机械拼接的方式将多个波导进行简单的连接从而获得更长的波导而不引起严重的损耗;滤波器的透射谱在0.1~0.5 THz之间有两个明显高损耗带;这两组实验结果均与理论预计非常接近。本文运用太赫兹波导和滤波器的实例证实了3D打印技术加工太赫兹器件的可行性,将会成为获取性能可控、价格低廉的太赫兹器件的有效途径。

Fabrication of terahertz device by 3D printing technology

High performance terahertz devices play an essential role in controlling terahertz waves to realize diverse applications. Here we report our work on the design of THz devices manufactured by a commercially available 3D printer, and the parameters of samples are measured by transmission terahertz time-domain spectroscopy system. Taking terahertz waveguide and terahertz filter as examples, Kagome photonic crystal waveguide and one-dimensional photonic crystal structure filter are chosen respectively, and we experimentally demonstrate that the obtained waveguide features average power propagation loss of 0.02 cm^-1(the minimum is about 0.002 cm^-1) in the range of 0.2-1.0 THz. More interesting, it could be simply mechanically spliced to obtain longer waveguides without causing serious loss. Besides, Terahertz filter features two apparent high loss bands between 0.1-0.5 THz. The transmission characteristics of both the waveguide and the filter are well predicted by the corresponding numerical simulation. The fabricated approach of THz devices based on the 3D printing technique will be a promising solution to fabricate terahertz device with well controllable characteristics and low cost.