Terahertz Behavior of Optical Components and Common Materials

As short range, ground based, surveillance systems operating at terahertz frequencies continue to evolve, increasing attention is being directed towards the behavior of dielectric materials at terahertz frequencies as well as the behavior of optical components used to control terahertz radiation. Th...

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Bibliographic Details
Main Authors: Gatesman, Andrew J, Danylov, Andriy, Goyette, Thomas M, Dickinson, Jason C, Giles, Robert H, Goodhue, William, Waldman, Jerry, Nixon, William E, Hoen, Weber
Format: Report
Language:English
Subjects:
Active & Passive Radar Detection & Equipment
ARTIFICIAL DIELECTRICS
ATTENUATION
DIELECTRIC PROPERTIES
Electricity and Magnetism
FREQUENCY SELECTIVE SURFACES
MATERIALS
OPTICAL PROPERTIES
Optics
TERAHERTZ BANDPASS FILTERS
TERAHERTZ MATERIALS CHARACTERIZATION SYSTEMS
TERAHERTZ RESISTIVE SHEETS
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Summary:As short range, ground based, surveillance systems operating at terahertz frequencies continue to evolve, increasing attention is being directed towards the behavior of dielectric materials at terahertz frequencies as well as the behavior of optical components used to control terahertz radiation. This work provides an overview of several terahertz optical components such as frequency selective filters, laser output couplers, artificial dielectrics, and electromagnetic absorbers. In addition, a database was established that contains terahertz properties of common materials that have been largely unexplored in this region of the spectrum. The database consists of transmittance and reflectance spectra of a variety of materials measured using Fourier transform infrared spectroscopy techniques from 175 GHz - 2 THz. In addition, ultra-stable, CO2 optically pumped, far-infrared gas lasers were used to collect fixed-frequency transmittance data at 326 GHz, 584 GHz, and 1.04 THz. A Gunn oscillator was used for measurements at 94 GHz. Produced in collaboration with the U.S. Army National Ground Intelligence Center, Charlottesville, VA. The original document contains color images.