High Figure of Merit Refractive Index Sensor Derived From the Axial Length Ratio of Elliptically Polarized Light of Chiral Plasmonic Structure Arrays

The refractive index sensor based on the Fano resonance effect (that is, sensor) is one promising branch of plasmonic sensing applications owing to its narrow spectral line shape. Further improvement in sensitivity and figure merit (FOM) main issue this field. In contrast sensor, herein, we report a novel ultra-sensitive axial length ratio transmitted elliptically polarized light chiral structure arrays sensor). Compared with optimized same asymmetric arrays, proposed shows better performance 556.9 nm/RIU, that 1.31 times higher than sensor. Specifically, quality factor shape FOM reach 121.6 60, respectively, are 2.14 2.92 those respectively. Our study proposes potential path achieve high-quality sensing.