Journal
PLASMONICS
Volume 16, Issue 2, Pages 463-469Publisher
SPRINGER
DOI: 10.1007/s11468-020-01313-5
Keywords
Fano resonance; Mid-infrared; Long-range surface phonon resonance; Sub-wavelength grating
Funding
- Natural Science Foundation of Hubei Province [2019CFB598]
- Wuhan Science and Technology Bureau [2018010401011297]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [162301132703, G1323511794, CUG2018JM16]
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By introducing sub-wavelength grating (SWG) waveguide in the long-range surface phonon resonance (LRSPhR) device, a mid-infrared Fano resonance is formed, offering improved sensing performance. The index sensitivity and figure of merit of the sensor reach 7496 RIU-1 and 46,432 respectively, which is 6 times higher compared to conventional waveguide-coupled LRSPhR. The proposed SWG-coupled Fano resonance serves as a promising platform for mid-infrared biochemical sensing.
By introducing the sub-wavelength grating (SWG) waveguide in the long-range surface phonon resonance (LRSPhR) device, a mid-infrared Fano resonance is formed due to the coupling between surface phonon polariton and Bloch mode. By taking advantage of strong light-matter interaction in the SWG, such Fano resonance is expected to offer improved sensing performance. Based on the rigorous coupled-wave analysis (RCWA) method, the index sensitivity and figure of merit of such a sensor reach 7496 RIU-1 and 46,432, respectively, which is 6 times compared with the conventional waveguide-coupled LRSPhR. The proposed SWG-coupled Fano resonance can be a promising platform for mid-infrared biochemical sensing.
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