You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
8 May 2012Tunable THz absorption using Al/SiOx planar periodic structures
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.
The alert did not successfully save. Please try again later.
Brian Kearney, Fabio Alves, Dragoslav Grbovic, 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 (8 May 2012); https://doi.org/10.1117/12.918653