使用 ePTFE 膜的毫米波塑料光学多层减反射涂层
Multi-layer anti-reflection coats using ePTFE membrane for mm-wavelength plastic optics
AI总结：
针对高频毫米波塑料光学器件的减反射设计难题，提出利用分层压缩热粘合的 ePTFE 膜构建多层 AR 涂层，在宽半径内实现可调密度与厚度，结合其他聚合物层将反射率降至 0.2%-0.6%。
摘要：
未来的毫米波实验旨在增大孔径直径并拓宽带宽以提高接收机灵敏度。这些变化给折射和透射光学器件带来了极具挑战性的减反射（AR）设计问题。高频塑料光学器件需要在宽大面积上保持一致的薄聚合物涂层，而更宽的带宽则需要多层设计。我们提出了一种用于高频 BICEP Array 接收机（200-300 GHz）塑料光学器件的多层 AR 涂层，采用膨胀聚四氟乙烯（ePTFE）膜，分层并压缩热粘合至自身。该工艺允许在宽半径（33cm）内实现一系列密度（从 0.3g/cc 到 1g/cc）和厚度（>0.05mm），为潜在 AR 涂层的参数空间开辟了有趣的方向。分层 ePTFE 膜与其他聚合物层结合，在高密度聚乙烯和薄高模量聚乙烯窗口上分别产生了 0.2% 至 0.6% 的频带平均反射率。
英文摘要：
Future millimeter wavelength experiments aim to both increase aperture diameters and broaden bandwidths to increase the sensitivity of the receivers. These changes produce a challenging anti-reflection (AR) design problem for refracting and transmissive optics. The higher frequency plastic optics require consistently thin polymer coats across a wide area, while wider bandwidths require multilayer designs. We present multilayer AR coats for plastic optics of the high frequency BICEP Array receiver (200-300 GHz) utilizing an expanded polytetrafluoroethylene (ePTFE) membrane, layered and compressively heat-bonded to itself. This process allows for a range of densities (from 0.3g/cc to 1g/cc) and thicknesses (>0.05mm) over a wide radius (33cm), opening the parameter space of potential AR coats in interesting directions. The layered ePTFE membrane has been combined with other polymer layers to produce band average reflections between 0.2% and 0.6% on high density polyethylene and a thin high modulus polyethylene window, respectively.
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