Title

Scanning Fabry-Perot Filter For Terahertz Spectroscopy Based On Silicon Dielectric Mirrors

Keywords

Bragg mirror; Dielectric mirror; Fabry-Perot; Far-IR; Millimeter wave; Terahertz

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.

Publication Date

5-23-2007

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

6472

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.700718

Socpus ID

34248674052 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34248674052

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