Frequency selective bolometers

M.S. Kowitt, D.J. Fixsen, A. Goldin, S.S. Meyer

Research output: Contribution to journalJournal articleResearchpeer-review


We propose a concept for radiometry in the millimeter, the submillimeter, and the far-IR spectral regions, the frequency selective bolometer (FSB). This system uses a bolometer as a coupled element of a tuned quasi-optical interference filter in which the absorption, the transmission, and the reflection characteristics of the filter depend on the frequency in a controlled manner. Several FSB's can be cascaded within a straight light pipe to produce a high-efficiency, compact, multiband radiometer. A prototype design is presented together with its anticipated performance based on a one-dimensional transmission-line model. Instruments based on FSB technology should have several advantages over current multiband bolometric radiometers including smaller and more compact cryogenic optics; reduced demands on cryostat size and weight, high coupling efficiency, minimum constraints on the geometry in the focal plane. An FSB system can be configured as a multiband, close-packed focal-plane array, permitting efficient use of the throughput of a telescope.
Original languageEnglish
JournalApplied Optics
Issue number28
Pages (from-to)5630-5635
Publication statusPublished - 1996


  • frequency selective bolometer
  • bolometer
  • cryogenic
  • resonance filter
  • resonant mesh


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