Experimental demonstration of ultrasensitive sensing with terahertz metamaterial absorbers: A comparison with the metasurfaces
Experimental demonstration of ultrasensitive sensing with terahertz metamaterial absorbers: A comparison with the metasurfaces
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DOI：
10.1063/1.4906109
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发表时间：
2015-01-19
影响因子：
4
通讯作者：
Singh, Ranjan
中科院分区：
文献类型：
--
作者：
Cong, Longqing;Tan, Siyu;Singh, Ranjan
平面超颖表面和等离子体谐振器在从微波到光频的电磁域传感应用中表现出了巨大的前景。然而，由于等离子体超材料系统中的辐射和非辐射损耗通道，这些传感器具有较低的品质因数和灵敏度。我们展示了一种基于超材料吸收体的超灵敏传感方案，在太赫兹频率下具有显着增强的灵敏度和一个数量级更高的品质因数相比，平面元表面。阻抗匹配吸收腔中的磁共振场和电共振场增强使得能够与电介质分析物进行更强的相互作用。这一发现为完美的超材料吸收剂提供了机会，可以作为电磁频谱指纹区域的有效传感器，其中有几种有机，爆炸物和生物分子在太赫兹频率下具有独特的光谱特征。(C)2015 AIP Publishing LLC.
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. (C) 2015 AIP Publishing LLC.