Surface plasmon polaritons enhanced magnetic plasmon resonance for high-quality sensing

Abstract

We investigate the metamaterials consisting of the top layer U-shaped metallic split-ring resonators (SRRs), the middle thin dielectric layer, and the bottom thick metal film, which can realize high-quality refractive index sensing. When propagating surface plasmon polaritons are introduced, two ultra-narrow-band hybridized modes will appear, whose full width at half maximum can reach up 2.5 nm. Because of ultra-narrow linewidth and huge magnetic field enhancement at hybridized modes, the metamaterials displays very high sensitivity (S = 912 nm/RIU, S* = 95.64/RIU) and large figure of merit (FOM = 364.8, FOM*= 160740.34), which has great potential in the label-free biomedical sensing.

Sensing Performance of Ethanol Microfiber Probe Augmented by ZnO Nanosheet and UV Glue Film

“…Unlike electrical signal measurement, some optical detection mechanisms, including laser spectra direct absorption, optical thermal spectra, micro/nano-photonics effects, etc., provide effective methods for accurate, real-time, and room temperature monitoring of hazardous gases with flammable and explosive properties [18]. Among miniature and compact optical gas sensors or devices, high-precision detection performance has been demonstrated in plasmonic micro-chips based on noble metal nanostructures [19] and micro-resonators based on dielectric metamaterials [20,21]. Although their excellent performance has been verified, nano-photonics devices are still seriously limited by the stringent requirements for precise nano-processing techniques and the high cost of equipment.…”