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Published September 24, 2012 | Published
Book Section - Chapter Open

SuperSpec: design concept and circuit simulations

Abstract

SuperSpec is a pathfinder for future lithographic spectrometer cameras, which promise to energize extra-galactic astrophysics at (sub)millimeter wavelengths: delivering 200–500 km s^(-1) spectral velocity resolution over an octave bandwidth for every pixel in a telescope's field of view. We present circuit simulations that prove the concept, which enables complete millimeter-band spectrometer devices in just a few square-millimeter footprint. We evaluate both single-stage and two-stage channelizing filter designs, which separate channels into an array of broad-band detectors, such as bolometers or kinetic inductance detector (KID) devices. We discuss to what degree losses (by radiation or by absorption in the dielectric) and fabrication tolerances affect the resolution or performance of such devices, and what steps we can take to mitigate the degradation. Such design studies help us formulate critical requirements on the materials and fabrication process, and help understand what practical limits currently exist to the capabilities these devices can deliver today or over the next few years.

Additional Information

© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). M. Hollister and L. Swenson acknowledge funding from the NASA Postdoctoral Program. C. McKenney, E. Shirokoff, and L. Swenson acknowledge support by the Keck Institute for Space Studies. We also acknowledge funding for the development of SuperSpec by the NASA Astrophysics Research and Analysis grant # 399131.02.06.03.43. P. S. Barry acknowledges the continuing support from the Science and Technology Facilities Council Ph.D studentship programme and grant programmes ST/G002711/1 and ST/J001449/1.

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