Numerical optimization of integrating cavities for diffraction-limited millimeter-wave bolometer arrays

Jason Glenn, Goutam Chattopadhyay, Samantha F. Edgington, Andrew E. Lange, James J. Bock, Philip Mauskopf, Adrian T. Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Far-infrared to millimeter-wave bolometers designed to make astronomical observations are typically encased in integrating cavities at the termination of feedhorns or Winston cones. This photometer combination maximizes absorption of radiation, enables the absorber area to be minimized, and controls the directivity of absorption, thereby reducing susceptibility to stray light. In the next decade, arrays of hundreds of silicon nitride micromesh bolometers with planar architectures will be used in ground-based, suborbital, and orbital platforms for astronomy. The optimization of integrating cavity designs is required for achieving the highest possible sensitivity for these arrays. We report numerical simulations of the electromagnetic fields in integrating cavities with an infinite plane-parallel geometry formed by a solid reflecting backshort and the back surface of a feedhorn array block. Performance of this architecture for the bolometer array camera (Bolocam) for cosmology at a frequency of 214 GHz is investigated. We explore the sensitivity of absorption efficiency to absorber impedance and backshort location and the magnitude of leakage from cavities. The simulations are compared with experimental data from a room-temperature scale model and with the performance of Bolocam at a temperature of 300 mK. The main results of the simulations for Bolocam-type cavities are that (1) monochromatic absorptions as high as 95% are achievable with <1% cross talk between neighboring cavities, (2) the optimum absorber impedances are 400 Ω/sq, but with a broad maximum from ∼150 to ∼700 Ω/sq, and (3) maximum absorption is achieved with absorber diameters ≥1.5λ. Good general agreement between the simulations and the experiments was found.

Original languageEnglish (US)
Pages (from-to)136-142
Number of pages7
JournalApplied Optics
Volume41
Issue number1
StatePublished - Jan 1 2002
Externally publishedYes

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Bolometers
bolometers
Millimeter waves
millimeter waves
Diffraction
cavities
optimization
absorbers
diffraction
Cameras
cameras
Cosmology
Temperature scales
Stray light
simulation
Photometers
impedance
Astronomy
Silicon nitride
temperature scales

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Glenn, J., Chattopadhyay, G., Edgington, S. F., Lange, A. E., Bock, J. J., Mauskopf, P., & Lee, A. T. (2002). Numerical optimization of integrating cavities for diffraction-limited millimeter-wave bolometer arrays. Applied Optics, 41(1), 136-142.

Numerical optimization of integrating cavities for diffraction-limited millimeter-wave bolometer arrays. / Glenn, Jason; Chattopadhyay, Goutam; Edgington, Samantha F.; Lange, Andrew E.; Bock, James J.; Mauskopf, Philip; Lee, Adrian T.

In: Applied Optics, Vol. 41, No. 1, 01.01.2002, p. 136-142.

Research output: Contribution to journalArticle

Glenn, J, Chattopadhyay, G, Edgington, SF, Lange, AE, Bock, JJ, Mauskopf, P & Lee, AT 2002, 'Numerical optimization of integrating cavities for diffraction-limited millimeter-wave bolometer arrays', Applied Optics, vol. 41, no. 1, pp. 136-142.
Glenn J, Chattopadhyay G, Edgington SF, Lange AE, Bock JJ, Mauskopf P et al. Numerical optimization of integrating cavities for diffraction-limited millimeter-wave bolometer arrays. Applied Optics. 2002 Jan 1;41(1):136-142.
Glenn, Jason ; Chattopadhyay, Goutam ; Edgington, Samantha F. ; Lange, Andrew E. ; Bock, James J. ; Mauskopf, Philip ; Lee, Adrian T. / Numerical optimization of integrating cavities for diffraction-limited millimeter-wave bolometer arrays. In: Applied Optics. 2002 ; Vol. 41, No. 1. pp. 136-142.
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