You are here

UCF Digital Collections ยป ETD Collection

SCANNING FABRY-PEROT SPECTROMETER FOR TERAHERTZ AND GIGAHERTZ SPECTROSCOPY USING DIELECTRIC BRAGG MIRRORS

Download pdf | Full Screen View

Date Issued:
2007
Abstract/Description:
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 including factors that affect achievable finesse. Fundamental loss by lattice and free carrier absorption are considered. High resistivity in the silicon layers was found important for achieving high transmittance and finesse, especially at the longer wavelengths. Also considered are technological factors such as surface roughness, bowing, and misalignment for various proposed manufacturing schemes. Characterization was performed at sub-mm wavelengths using a gas laser together with a Golay cell detector and at millimeter wavelengths using a backward wave oscillator and microwave power meter. A finesse value of 422 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.
Title: SCANNING FABRY-PEROT SPECTROMETER FOR TERAHERTZ AND GIGAHERTZ SPECTROSCOPY USING DIELECTRIC BRAGG MIRRORS.
28 views
15 downloads
Name(s): Cleary, Justin, Author
Peale, Robert, Committee Chair
University of Central Florida, Degree Grantor
Type of Resource: text
Date Issued: 2007
Publisher: University of Central Florida
Language(s): English
Abstract/Description: 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 including factors that affect achievable finesse. Fundamental loss by lattice and free carrier absorption are considered. High resistivity in the silicon layers was found important for achieving high transmittance and finesse, especially at the longer wavelengths. Also considered are technological factors such as surface roughness, bowing, and misalignment for various proposed manufacturing schemes. Characterization was performed at sub-mm wavelengths using a gas laser together with a Golay cell detector and at millimeter wavelengths using a backward wave oscillator and microwave power meter. A finesse value of 422 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.
Identifier: CFE0001563 (IID), ucf:47128 (fedora)
Note(s): 2007-05-01
M.S.
Sciences, Department of Physics
Masters
This record was generated from author submitted information.
Subject(s): Fabry-Perot
terahertz
gigahertz
sub-mm
mm
Bragg mirror
far-IR
etching
dielectric mirror
Persistent Link to This Record: http://purl.flvc.org/ucf/fd/CFE0001563
Restrictions on Access: public
Host Institution: UCF

In Collections