2023.9.12 由硕士研究生吴仲博完成的研究论文”Characterization of CCTRC waveguide and measurement of vitamin C concentration”被《Plasmonics》录用！祝贺！

Abstract

In order to realize optical sensing with high sensitivity and the figure of merit, in this study, we propose a metal-insulator-metal (MIM) waveguide structure based on the transmission properties of surface plasmon excitations (SPPs). This structure consists of main waveguide with a metal baffle (MWMB) combined with a copper coin-type ring cavity (CCTRC) and a double semi-elliptical ring cavity (DSERC). We study the electromagnetic characteristics, transmission performance, and sensing performance of the structure by simulating numerical calculations using the finite element method. In addition, we optimize the structural parameters. The results indicate when the TM wave is incident on the main waveguide, the designed MIM waveguide structure exhibits double Fano resonance peaks at incident wavelengths at 842 nm and 926 nm, with total electric field energies of 2.93×10 -14 J and 2.35×10 -14 J, respectively. At the same wavelengths ， total magnetic field energies is 1.33×10 -14 J and 1.32×10 -14 J, respectively. Therefore, the proposed structure can be used for the refractive index sensor. The extant structure's sensitivity and the figure of merit are 1150nm/RIU and 115, respectively. The resonance wavelength shift was identified, allowing the present structure to measure the concentration of aqueous vitamin C solutions.