Revéret Vincent, Rodriguez Louis, Agnèse Patrick
Laboratoire AIM Paris-Saclay, CNRS/INSU CEA/Irfu Université Paris-Diderot, F-91191 Gif-sur-Yvette, France.
Appl Opt. 2010 Dec 10;49(35):6726-36. doi: 10.1364/AO.49.006726.
Future missions for astrophysical studies in the submillimeter region will need detectors with very high sensitivity and large fields of view. Bolometer arrays can fulfill these requirements over a very broad band. We describe a technique that enables bolometer arrays that use quarter-wave cavities to have a high spectral response over most of the submillimeter band. This technique is based on the addition on the front of the array of an antireflecting dielectric layer. The optimum parameters (layer thickness and distance to the array) are determined by a 2D analytic code. This general principle is applied to the case of Herschel PACS bolometers (optimized for the 60 to 210 μm band). As an example, we demonstrate experimentally that a PACS array covered by a 138 μm thick silicon layer can improve the spectral response by a factor of 1.7 in the 450 μm band.
未来在亚毫米波区域进行天体物理研究的任务将需要具有非常高灵敏度和大视场的探测器。测辐射热计阵列能够在很宽的频带上满足这些要求。我们描述了一种技术，该技术能使使用四分之一波长腔的测辐射热计阵列在大部分亚毫米波波段具有高光谱响应。此技术基于在阵列前端添加一层抗反射介电层。最佳参数（层厚度和到阵列的距离）由二维解析代码确定。这一通用原理应用于赫歇尔光谱和光度成像接收器（Herschel PACS）测辐射热计的情况（针对60至210微米波段进行了优化）。例如，我们通过实验证明，覆盖有138微米厚硅层的PACS阵列在450微米波段可将光谱响应提高1.7倍。
