Abstract
A novel band-stop metal–insulator–metal plasmonic waveguide filter with high efficient filtering and high sensitivity is proposed and investigated theoretically. The relationship among the wavelength of the incident wave, the refractive index of the measured material and the transmittance of the incident wave is simulated by finite-difference time-domain (FDTD) and coupled mode theory (CMT) method. The filters which consist of a straight waveguide and two square resonators embedded with silver nanorods have minimum transmittance of 0.04%, 2.2%, 14.9% and 9.0% at the dips. The maximum sensitivity could reach 2860 nm/RIU. The sensitivity of the filter to detect plasma, hemoglobin, glucose and Sylgard184 reaches 2854 nm/RIU, 2852 nm/RIU, 2850 nm/RIU, 2851 nm/RIU, respectively. This waveguide filter may provide a new reference for highly integrated optical circuits and refractive index sensor.
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