Journal
OPTICS EXPRESS
Volume 25, Issue 26, Pages 32280-32289Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.032280
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Funding
- Postdoctoral Scientific Research Fund of Heilongjiang [LBH-Q16061]
- 111 project [B13015]
- Fundamental Research Funds for the Central Universities
- Postdoctoral Science Foundation of China [2014M551216]
- National Natural Science Foundation of China
- Chinese Academy of Sciences [U1631239, U1331114]
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We report a compact triple-band tunable perfect terahertz metamaterial absorber (TMA) at the subwavelength scale of thickness, which is composed of a planar metallic disk resonator array above a conductive ground plane separated with liquid crystal (LC) mixture. The calculations of terahertz absorption spectra demonstrate triple near-unity absorption bands in the gap plasmonic resonance coupling regime. Three resonance frequencies of the absorber exhibit continuous linear-tunability as changing the refractive index of LC. Remarkably, each peak absorbance of the triple bands maintains at a level of beyond 99% in the whole tuning operation, and the absorbance can remain more than 90% over a wide range of incident angles. Our work suggests that the LC tunable absorber scheme has the potential to overcome the basic difficulty to perform simultaneously multiband spectral tuning and near-unity absorbance with wide angle of incidence and weak polarization dependence. The proposed LC-tunable multiband perfect TMA is promising in the application of biomolecular spectra-selective terahertz imaging and sensing. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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