论文标题
3D打印一维光子晶体的Terahertz光子带隙的机械调整
Mechanical Tuning of the Terahertz Photonic Bandgap of 3D-Printed One-Dimensional Photonic Crystals
论文作者
论文摘要
在Terahertz光谱范围内证明了3D打印的基于聚合物的一维光子晶体的机械调整。研究的光子晶体由13个交替的紧凑型和低密度层组成，并通过单步立体刻光造影制成。虽然紧凑型层完全是多甲基丙烯酸酯，而无需任何有意的内部结构，但低密度层包含次波长尺寸的倾斜柱状夹杂物，以使机械压缩沿正态的方向与光子晶体的层接口界面。光子晶体的Terahertz传输光谱在光谱范围为83至124 GHz作为压缩应变的函数。成熟的光子晶体显示出以109 GHz为中心的明显的光子带隙，蓝色在压缩应力下移动。实验证明了在带隙中心频率中的最大偏移12 GHz。使用简单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。发现了实验和模型计算的传输光谱之间的良好一致性。
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.
