Cataldo Giuseppe, Hsieh Wen-Ting, Huang Wei-Chung, Moseley S Harvey, Stevenson Thomas R, Wollack Edward J
Appl Opt. 2014 Feb 20;53(6):1094-102. doi: 10.1364/AO.53.001094.
High-performance, integrated spectrometers operating in the far-infrared and submillimeter ranges promise to be powerful tools for the exploration of the epochs of reionization and initial galaxy formation. These devices, using high-efficiency superconducting transmission lines, can achieve the performance of a meter-scale grating spectrometer in an instrument implemented on a 4 inch silicon wafer. Such a device, when combined with a cryogenic telescope in space, provides an enabling capability for studies of the early universe. Here, the optical design process for Micro-Spec (μ-Spec) is presented, with particular attention given to its two-dimensional diffractive region, where the light of different wavelengths is focused on the different detectors. The method is based on the stigmatization and minimization of the light path function in this bounded region, which results in an optimized geometrical configuration. A point design with an efficiency of ~90% has been developed for initial demonstration and can serve as the basis for future instruments. Design variations on this implementation are also discussed, which can lead to lower efficiencies due to diffractive losses in the multimode region.
工作在远红外和亚毫米波段的高性能集成光谱仪有望成为探索再电离时期和早期星系形成的强大工具。这些设备采用高效超导传输线，在一个4英寸硅片上实现的仪器中，能够达到米级光栅光谱仪的性能。这样的设备与太空中的低温望远镜相结合，为早期宇宙的研究提供了一种可行的能力。在此，介绍了微光谱仪（μ-Spec）的光学设计过程，特别关注其二维衍射区域，不同波长的光在该区域聚焦到不同的探测器上。该方法基于在这个有界区域内对光程函数的消像散和最小化，从而得到优化的几何结构。已经开发出一种效率约为90%的点设计用于初步演示，并可作为未来仪器的基础。还讨论了这种实现方式的设计变体，由于多模区域的衍射损耗，这些变体可能导致效率降低。
