Electrohydrodynamic Jet Printing of 1D Photonic Crystals: Part II-Optical Design and Reflectance Characteristics
Electrohydrodynamic Jet Printing of 1D Photonic Crystals: Part II-Optical Design and Reflectance Characteristics
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DOI：
10.1002/admt.202000431
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发表时间：
2020-08-26
影响因子：
6.8
通讯作者：
Shtein, Max
中科院分区：
文献类型：
--
作者：
Iezzi, Brian;Afkhami, Zahra;Shtein, Max
增材制造系统可以将多种材料任意存款到跨越微米到纳米级的精确3D空间中，从而实现具有有用的热、电和光学特性的新型结构。在这篇配套论文中，研究了电流体动力学喷射（e-jet）打印在沉积具有微米级空间分辨率和纳米级厚度控制的多材料多层膜方面的能力，并演示了这种能力在创建1D光子晶体（1DPC）时的响应接近可见光区域。转移矩阵模拟用于评估不同的材料类别中使用的印刷的1DPC，和商业上可获得的光聚合物具有不同的折射率（n= 1.35至1.70）的基础上选择其相对高的折射率对比度和快速固化时间。然后使用电子喷射印刷来实验性地展示像素化的1DPC，其具有在80和200 nm之间的单个层厚度，小于40 μ m的正方形像素，具有小于20 nm的表面粗糙度。使用空间选择性显微光谱测量的反射特性的印刷的1DPC和相关的传输矩阵模拟。这些结果是实现先进成像设备或光子晶体传感平台的成本效益，定制制造的重要一步。
Additive manufacturing systems that can arbitrarily deposit multiple materials into precise, 3D spaces spanning the micro- to nanoscale are enabling novel structures with useful thermal, electrical, and optical properties. In this companion paper set, electrohydrodynamic jet (e-jet) printing is investigated for its ability in depositing multimaterial, multilayer films with microscale spatial resolution and nanoscale thickness control, with a demonstration of this capability in creating 1D photonic crystals (1DPCs) with response near the visible regime. Transfer matrix simulations are used to evaluate different material classes for use in a printed 1DPC, and commercially available photopolymers with varying refractive indices (n= 1.35 to 1.70) are selected based on their relative high index contrast and fast curing times. E-jet printing is then used to experimentally demonstrate pixelated 1DPCs with individual layer thicknesses between 80 and 200 nm, square pixels smaller than 40 mu m across, with surface roughness less than 20 nm. The reflectance characteristics of the printed 1DPCs are measured using spatially selective microspectroscopy and correlated to the transfer matrix simulations. These results are an important step toward enabling cost-effective, custom-fabrication of advanced imaging devices or photonic crystal sensing platforms.