Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 231, Issue -, Pages 74-80Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2015.02.040
Keywords
Metamaterials perfect absorber; Optically tuning; Flexible; Terahertz
Funding
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1309835] Funding Source: National Science Foundation
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We present our recent progress on a highly flexible tunable perfect absorber at terahertz frequencies. Metamaterial unit cells were patterned on thin GaAs patches, which were fashioned in an array on a 10 mu m thick polyimide substrate via semiconductor transfer technique, and the backside of the substrate was coated with gold film as a ground plane. Optical-pump THz-probe reflection measurements show that the absorptivity can be tuned up to 25% at 0.78 THz and 40% at 1.75 THz through photo-excitation of free carriers in GaAs layers in presence of 800 am pump beam. Our flexible tunable metamaterial perfect absorber has potential applications in energy harvesting, THz modulation and even camouflages coating. (C) 2015 Elsevier B.V. All rights reserved.
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