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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 6 — Feb. 20, 2014
  • pp: 1094–1102

Micro-Spec: an ultracompact, high-sensitivity spectrometer for far-infrared and submillimeter astronomy

Giuseppe Cataldo, Wen-Ting Hsieh, Wei-Chung Huang, S. Harvey Moseley, Thomas R. Stevenson, and Edward J. Wollack  »View Author Affiliations

Applied Optics, Vol. 53, Issue 6, pp. 1094-1102 (2014)

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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.

© 2014 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(220.2740) Optical design and fabrication : Geometric optical design
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 22, 2013
Revised Manuscript: December 17, 2013
Manuscript Accepted: January 7, 2014
Published: February 13, 2014

Giuseppe Cataldo, Wen-Ting Hsieh, Wei-Chung Huang, S. Harvey Moseley, Thomas R. Stevenson, and Edward J. Wollack, "Micro-Spec: an ultracompact, high-sensitivity spectrometer for far-infrared and submillimeter astronomy," Appl. Opt. 53, 1094-1102 (2014)

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