Experimental demonstration of ultrasensitive sensing with terahertz metamaterial absorbers: A comparison with the metasurfaces

Applied Physics Letters - Tập 106 Số 3 - 2015
Longqing Cong1,2, Siyu Tan3,4, Riad Yahiaoui5, Fengping Yan3, Weili Zhang4, Ranjan Singh1,2
1Nanyang Technological University 1 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, , Singapore 637371, Singapore
2Nanyang Technological University 2 Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, , Singapore 637371, Singapore
3Beijing Jiaotong University 4 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC, Institute of Lightwave Technology, , Beijing 100044, People's Republic of China
4Oklahoma State University 3 School of Electrical Engineering and Computer Science, , Stillwater, Oklahoma 87074, USA
5Limoges University 5 XLIM, , CNRS, UMR 7252, 7 rue Jules Vallès, F-19100 Brive, France

Tóm tắt

Planar metasurfaces and plasmonic resonators have shown great promise for sensing applications across the electromagnetic domain ranging from the microwaves to the optical frequencies. However, these sensors suffer from lower figure of merit and sensitivity due to the radiative and the non-radiative loss channels in the plasmonic metamaterial systems. We demonstrate a metamaterial absorber based ultrasensitive sensing scheme at the terahertz frequencies with significantly enhanced sensitivity and an order of magnitude higher figure of merit compared to planar metasurfaces. Magnetic and electric resonant field enhancement in the impedance matched absorber cavity enables stronger interaction with the dielectric analyte. This finding opens up opportunities for perfect metamaterial absorbers to be applied as efficient sensors in the finger print region of the electromagnetic spectrum with several organic, explosive, and bio-molecules that have unique spectral signature at the terahertz frequencies.

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Applied Physics Letters

Tập 106 Số 3

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