Lithographed spectrometers for tomographic line mapping of the Epoch of Reionization

• DOI: 10.1117/12.2057319
• Publication Date: 2014-08-19T18:57:34Z
• Authors: R. O'Brient; J. J. Bock; C. M. Bradford; A. Crites; R. Duan; S. Hailey-Dunsheath; J. Hunacek; R. LeDuc; E. Shirokoff; Z. Staniszewski; A. Turner; M. Zemcov
• Keywords: 0103 physical sciences; Epoch of Reionization; spectrometer; 530; 01 natural sciences; 520

The Tomographic Ionized carbon Mapping Experiment (TIME) is a multi-phased experiment that will topographically map [CII] emission from the Epoch of Reionization. We are developing lithographed spectrometers that couple to TES bolometers in anticipation of the second generation instrument. Our design intentionally mirrors many features of the parallel SuperSpec project, inductively coupling power from a trunk-line microstrip onto half-wave resonators. The resonators couple to a rat-race hybrids that feeds TES bolometers. Our 25 channel prototype shows spectrally positioned lines roughly matching design with a receiver optical efficiency of 15-20%, a level that is dominated by loss in components outside the spectrometer.