Journal
APPLIED SCIENCES-BASEL
Volume 9, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/app9071410
Keywords
metamaterials; triple-band absorption; terahertz; sensing
Categories
Funding
- National Natural Science Foundation of China [51605148, 11647143]
- Natural Science Foundation of Jiangsu [BK20160189]
- Fundamental Research Funds for the Central Universities [JUSRP51721B]
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This paper presents a simple metamaterial design to achieve the triple-band near-perfect absorption response that can be used in the area of sensor application. The introduced absorber consists of an array of Au strip and a bulk flat Au film separated by an insulator dielectric layer. Three narrow-band resonance absorption peaks are obtained by superposing three different modes (a fundamental mode resonance and two high-order responses) of the Au strip. These resonance modes (in particular of the last two modes) have large sensitivity to the changes of the surrounding index, overlayer thickness and the refractive index of the overlayer.
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