Journal
IEEE ACCESS
Volume 8, Issue -, Pages 219525-219533Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.3039503
Keywords
Metamaterials; Magnetic materials; Refractive index; Metals; Substrates; Sensitivity; Biosensors; Magnetic resonance; electric resonance; sensitivity; terahertz metamaterial sensing
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Funding
- National Natural Science Foundation of China [61205204, 61701207, 61804071]
- China Scholarship Council Foundation [201406185011]
- Natural Science Foundation of Gansu Province [1606RJZA068, 17JR5RA119, 18JR3RA297]
- State Key Laboratory of Millimeter Waves of Southeast University [K201717]
- Fundamental Research Funds for the Central Universities of China [lzujbky-2018-129, lzujbky-2018-127]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
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To overcome the effect of analyte thickness and limitation of single wavelength sensing, we propose an ultra-sensitive stereo metamaterial biosensor with double resonance frequencies based on coupling electric resonance and magnetic resonance. The electromagnetic analysis demonstrates that the double resonance coupling, induced by the stereo double-layer structure, can significantly improve sensitive biosensing at the terahertz frequency. The results show that by changing the size of the structure, each resonance frequency can be independently tuned in the range of 0.5-1.8 THz and the maximum refractive index sensitivity is 930.4 GHz/RIU. These results have significant implications for the detection of samples with different frequency points. The proposed ultra-sensitive stereo metamaterial structure has excellent potential for application in biomolecule detection and differentiation.
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