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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 7 — Jul. 1, 2014
  • pp: 1557–1576

Angular and polarization response of multimode sensors with resistive-grid absorbers

Akito Kusaka, Edward J. Wollack, and Thomas R. Stevenson  »View Author Affiliations


JOSA A, Vol. 31, Issue 7, pp. 1557-1576 (2014)
http://dx.doi.org/10.1364/JOSAA.31.001557


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Abstract

High-sensitivity receiver systems with near-ideal polarization sensitivity are highly desirable for development of millimeter and submillimeter radio astronomy. Multimoded bolometers provide a unique solution to achieve such sensitivity, for which hundreds of single-mode sensors would otherwise be required. The primary concern in employing such multimoded sensors for polarimetery is the control of the polarization systematics. In this work, we examine the angular- and polarization-dependent absorption pattern of a thin resistive grid or membrane, which models an absorber used for a multimoded bolometer. The result shows that a freestanding thin resistive absorber with a surface resistivity of η / 2 , where η is the impedance of free space, attains a beam pattern with equal E - and H -plane responses, leading to zero cross-polarization. For a resistive-grid absorber, the condition is met when a pair of grids is positioned orthogonal to each other and both have a resistivity of η / 2 . When a reflective backshort termination is employed to improve absorption efficiency, the cross-polar level can be suppressed below 30 dB if acceptance angle of the sensor is limited to 60 ° . The small cross-polar systematics have even-parity patterns and do not contaminate the measurements of odd-parity polarization patterns, for which many of the recent instruments for cosmic microwave background are designed. Underlying symmetry that suppresses these cross-polar systematics is discussed in detail. The estimates and formalism provided in this work offer key tools in the design consideration of the instruments using the multimoded polarimeters.

© 2014 Optical Society of America

OCIS Codes
(030.4070) Coherence and statistical optics : Modes
(040.0040) Detectors : Detectors
(260.5430) Physical optics : Polarization
(350.1260) Other areas of optics : Astronomical optics
(350.4010) Other areas of optics : Microwaves

ToC Category:
Physical Optics

History
Original Manuscript: January 10, 2014
Revised Manuscript: May 6, 2014
Manuscript Accepted: May 6, 2014
Published: June 24, 2014

Citation
Akito Kusaka, Edward J. Wollack, and Thomas R. Stevenson, "Angular and polarization response of multimode sensors with resistive-grid absorbers," J. Opt. Soc. Am. A 31, 1557-1576 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-7-1557

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