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A Path to High Efficiency Optical Coupling for HIRMESThe high-resolution mid-infrared spectrometer (HIRMES) under development for SOFIA (Stratospheric Observatory for Infrared Astronomy) is an instrument operating in the 25-122 μm spectral range with a spectral resolution R= Δ ʎ /ʎ ~100,000 and has two absorber-coupled transition edge sensor (TES) bolometric detector focal planes. We have developed novel NbTiN low stress absorber coatings which have the required optical impedance across the HIRMES operating band. The low intrinsic stress of these coatings allow for a peak-to-valley corrugation amplitude < 5 μm of the 450 nm thick, 1.4 mm x 1.7 mm detector pixels. Furthermore, these coatings have a superconducting transition temperature ~ 10 K, which allows them to simultaneously serve as an absorber in the desired signal band and a rejection filter at long wavelengths. This attribute makes them especially attractive for ultrasensitive absorber-coupled bolometric detector applications, because it helps in controlling the optical loading from out-of band radiation. We also discuss a novel method for integrating a wedged reflective absorber-termination to the detector array.
Document ID
20180007558
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Miller, Timothy M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brown, Ari-David (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Costen, Nicholas (Stinger Ghaffarian Technologies, Inc. Greenbelt, MD, United States)
Franz, David (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kutyrev, Alexander (Maryland Univ. College Park, MD, United States)
Mikula, Vilem (Catholic Univ. of America Washington, DC, United States)
Miller, Kevin H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moseley, S. Harvey (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Oxborrow, Joseph (SB Microsystems Columbia, MD, United States)
Rostem, Karwan (Maryland Univ. Baltimore, MD, United States)
Wollack, Edward J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
November 7, 2018
Publication Date
July 17, 2017
Subject Category
Astrophysics
Engineering (General)
Report/Patent Number
GSFC-E-DAA-TN58928
Meeting Information
Meeting: 17th International Workshop on Low Temperature Detectors
Location: Kurume
Country: Japan
Start Date: July 17, 2018
End Date: July 21, 2018
Sponsors: Kurume Univ.
Funding Number(s)
CONTRACT_GRANT: NNG17PT01A
CONTRACT_GRANT: NNX15AG60G
CONTRACT_GRANT: GS-10F-049
CONTRACT_GRANT: NNG13CR48C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
bolometers
Detectors

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