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Proceedings Article

Tunable THz absorption using Al/SiOx planar periodic structures

[+] Author Affiliations
Brian Kearney, Fabio Alves, Dragoslav Grbovic, Gamani Karunasiri

Naval Postgraduate School (United States)

Proc. SPIE 8363, Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense, 836309 (May 1, 2012); doi:10.1117/12.918653
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From Conference Volume 8363

  • Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense
  • A. F. Mehdi Anwar; Nibir K. Dhar; Thomas W. Crowe; Tariq Manzur
  • Baltimore, Maryland, USA | April 23, 2012

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.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Brian Kearney ; Fabio Alves ; Dragoslav Grbovic and Gamani Karunasiri
"Tunable THz absorption using Al/SiOx planar periodic structures", Proc. SPIE 8363, Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense, 836309 (May 1, 2012); doi:10.1117/12.918653; http://dx.doi.org/10.1117/12.918653


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