Abstract
A single-layer guided-mode resonance (SGMR) structure as a refractive index sensor is proposed and experimentally demonstrated with enhanced sensing ability. The sensitivity enhancement is discussed based on the distribution of electric fields. It is found that the electric field distribution is concentrated in grating groove at TE polarization resonance, which significantly increases the strength of evanescent waves in analyte region. In the experiment, the bulk sensitivity with TE polarization is 229.43 nm/RIU, and 125.89 nm/RIU in TM polarization. In addition, based on the SGMR structure, the measured figure of merit (FOM) under TE polarization increased by about 351% compared with that under TM polarization. The results show that deep modulation within the SGMR structure leads to higher bulk sensitivity and increased FOM, which is desirable in sensors. The proposed SGMR has a simpler structure, it provides another method for optimizing GMR sensor and facilitates their practical application.
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