标题： 采用ePTFE膜的多层减反射涂层用于毫米波塑料光学器件 显示英文标题

标题： Multi-layer anti-reflection coats using ePTFE membrane for mm-wavelength plastic optics

摘要： 未来的毫米波长实验旨在通过增加孔径直径和扩展带宽来提高接收器的灵敏度。 这些变化为折射和透射光学元件带来了具有挑战性的抗反射（AR）设计问题。 高频塑料光学元件需要在整个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。 我们介绍了用于高频率BICEP阵列接收器（200-300 GHz）塑料光学元件的多层抗反射涂层，该涂层使用了膨胀聚四氟乙烯（ePTFE）膜，并通过层叠和压缩热结合的方式与自身连接。 这一过程允许在较大半径范围内（33厘米）实现密度范围（从0.3克/立方厘米到1克/立方厘米）和厚度（>0.05毫米），从而以有趣的方向扩展潜在的AR涂层参数空间。 层叠的ePTFE膜已与其他聚合物层结合，分别在高密度聚乙烯和薄高模量聚乙烯窗口上实现了介于0.2%和0.6%之间的平均带宽反射率。 显示英文摘要

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.