Mechanical tuning of a 3D-printed, polymer-based one-dimensional photonic crystal was demonstrated in the terahertz spectral range. The investigated photonic crystal consists of 13 alternating compact and low-density layers and was fabricated through single-step stereolithography. While the compact layers are entirely polymethacrylate without any intentional internal structures, the low-density layers contain sub-wavelength sized slanted columnar inclusions to allow the mechanical compression in a direction normal to the layer interfaces of the photonic crystal. Terahertz transmission spectroscopy of the photonic crystal was performed in a spectral range from 83 to 124 GHz as a function of the compressive strain. The as-fabricated photonic crystal showed a distinct photonic bandgap centered at 109 GHz, which blue shifted under compressive stress. A maximum shift of 12 GHz in the bandgap center frequency was experimentally demonstrated. Stratified optical models incorporating simple homogeneous and inhomogeneous compression approximations were used to analyze the transmission data. A good agreement between the experimental and model-calculated transmission spectra was found.

在太赫兹光谱范围内，对3D打印的，基于聚合物的一维光子晶体进行了机械调谐。被研究的光子晶体由13个交替的致密层和低密度层组成，并且是通过单步立体光刻法制造的。尽管致密层是完全聚甲基丙烯酸酯，没有任何有意的内部结构，但低密度层包含亚波长尺寸的倾斜柱状夹杂物，以允许在垂直于光子晶体层界面的方向上进行机械压缩。根据压缩应变，在83至124 GHz的光谱范围内进行了光子晶体的太赫兹透射光谱。制成的光子晶体在109 GHz处显示出明显的光子带隙，该蓝带在压缩应力作用下发生了蓝移。实验证明带隙中心频率最大偏移为12 GHz。结合简单的均匀和不均匀压缩近似的分层光学模型用于分析传输数据。实验和模型计算的透射光谱之间找到了很好的一致性。