Journal
OPTICAL MATERIALS EXPRESS
Volume 5, Issue 2, Pages 227-235Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.5.000227
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Funding
- National Natural Science Foundation of China [61176116, 11074069]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120161130003]
- Graduate Science and Technology Innovation Program of Hunan province [521298927]
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Metamaterial-based absorbers utilize the intrinsic loss, with the aid of appropriate structure design, to achieve near unity absorption at a certain frequency. The frequency of the reported absorbers is usually fixed and operates over a limited bandwidth, which greatly hampers their practical applications. Active or dynamic control over their resonance frequency is urgently necessary. Herein, we theoretically present a novel frequency tunable terahertz metamaterial absorber formed by a square metallic patch and a ground plane separated by a strontium titanate dielectric layer. Up to 80.2% frequency tuning is obtained by changing the temperature of the absorber, and there is very little variation in the strength of the absorption. The frequency shift is attributed to the temperature-dependent refractive index of the dielectric layer. Furthermore, the ratio between the lattice period and the resonance wavelength is close to 1/36 at 0.111 THz, which is smaller than the previously reported results. The proposed absorber has potential applications in detection, sensors, and selective thermal emitters. (C) 2014 Optical Society of America
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