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Proceedings Paper

Scanning Fabry-Perot filter for terahertz spectroscopy based on silicon dielectric mirrors
Author(s): Justin W. Cleary; Chris J. Fredricksen; Andrei V. Muravjov; Jasen Enz; Maxim V. Dolguikh; Todd W. Du Bosq; Robert E. Peale; William R. Folks; Sidhartha Pandey; Glenn Boreman; Oliver Edwards
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Paper Abstract

A scanning Fabry-Perot transmission filter composed of a pair of dielectric mirrors has been demonstrated at millimeter and sub-millimeter wavelengths. The mirrors are formed by alternating quarter-wave optical thicknesses of silicon and air in the usual Bragg configuration. Detailed theoretical considerations are presented for determining the optimum design. Characterization was performed at sub-mm wavelengths using a gas laser together with a Golay cell detector and at mm-wavelengths using a backward wave oscillator and microwave power meter. High resistivity in the silicon layers was found important for achieving high transmittance and finesse, especially at the longer wavelengths. A finesse value of 411 for a scanning Fabry-Perot cavity composed of three-period Bragg mirrors was experimentally demonstrated. Finesse values of several thousand are considered to be within reach. This suggests the possibility of a compact terahertz Fabry-Perot spectrometer that can operate in low resonance order to realize high free spectral range while simultaneously achieving a high spectral resolution. Such a device is directly suitable for airborne/satellite and man-portable sensing instrumentation.

Paper Details

Date Published: 8 February 2007
PDF: 12 pages
Proc. SPIE 6472, Terahertz and Gigahertz Electronics and Photonics VI, 64720E (8 February 2007); doi: 10.1117/12.700718
Show Author Affiliations
Justin W. Cleary, Univ. of Central Florida (United States)
Chris J. Fredricksen, Univ. of Central Florida (United States)
Andrei V. Muravjov, Univ. of Central Florida (United States)
Jasen Enz, Univ. of Central Florida (United States)
Maxim V. Dolguikh, Univ. of Central Florida (United States)
Todd W. Du Bosq, Univ. of Central Florida (United States)
Robert E. Peale, Univ. of Central Florida (United States)
William R. Folks, CREOL, Univ. of Central Florida (United States)
Sidhartha Pandey, CREOL, Univ. of Central Florida (United States)
Glenn Boreman, CREOL, Univ. of Central Florida (United States)
Oliver Edwards, Zyberwear Inc. (United States)


Published in SPIE Proceedings Vol. 6472:
Terahertz and Gigahertz Electronics and Photonics VI
Kurt J. Linden; Laurence P. Sadwick, Editor(s)

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