Tunable THz absorption using Al/SiOx planar periodic structures
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Authors
Kearney, Brian
Alves, Fabio
Grbovic, Dragoslav
Karunasiri, Gamani
Subjects
perfect absorber
multiband
metamaterial
Terahertz
multiband
metamaterial
Terahertz
Advisors
Date of Issue
2012
Date
Publisher
SPIE
Language
Abstract
To increase the sensitivity of uncooled microbolometer-based THz imagers, absorbing structures (metamaterial films) with resonant absorption that can be tuned to a QCL illuminator frequency are investigated. The metamaterial films are comprised of periodic arrays of aluminum (Al) squares and an Al ground plane separated by a thin silicon-rich silicon oxide (SiOx) dielectric film. Finite element simulations were performed by varying the structural parameters to establish the design criteria for high absorption, spectral tunability and bandwidth. Several structures with single band and multiband absorption characteristics were fabricated. Measured absorption spectra show absorption up to 100% at designed THz frequencies and the spectral characteristics agree with simulations.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1117/12.918653
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
7 p.
Citation
Kearney, Brian, et al. "Tunable THz absorption using Al/SiO x planar periodic structures." Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense. Vol. 8363. International Society for Optics and Photonics, 2012.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.