High-sensitivity Bloch surface wave sensor with Fano resonance in grating-coupled multilayer structures |
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| Affiliation: | 1.Institute of Intelligent Flexible Mechatronics, Jiangsu University, Zhenjiang 212013, China;2.National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China |
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| Abstract: | A new type of device consisting of a lithium niobate film coupled with a distributed Bragg reflector (DBR) was theoretically proposed to explore and release Bloch surface waves for applications in sensing and detection. The film and grating made of lithium niobate (LiNbO3) were placed on both sides of the DBR and a concentrated electromagnetic field was formed at the film layer. By adjusting the spatial incidence angle of the incident light, two detection and analysis modes were obtained, including surface diffraction detection and guided Bloch detection. Surface diffraction detection was used to detect the gas molecule concentrations, while guided Bloch detection was applied for the concentration detection of biomolecule-modulated biological solutions. According to the drift of the Fano curve, the average sensor sensitivities from the analysis of the two modes were 1560 °/RIU and 1161 °/RIU, and the maximum detection sensitivity reached 2320 °/RIU and 2200 °/RIU, respectively. This study revealed the potential application of LiNbO3 as a tunable material when combined with DBR to construct a new type of biosensor, which offered broad application prospects in Bloch surface wave biosensors. |
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| Keywords: | lithium niobate Bloch surface wave Fano resonance grating structure biosensor |
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