Spectral characteristic based on sectorial-ring cavity resonator coupled to plasmonic waveguide
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We propose and investigate left- or right-handed sectorial-ring cavity resonator coupled to metal-insulator-metal plasmonic waveguide. This resonator has the advantages of realizing simple, compact, asymmetrical, multiple, and controllable or tunable cavity, which is a novel plasmonic nanofilter or nanosensor. According to the two-dimensional simulation, the results indicate that the left- or right-handed resonator is the identical effect, and two resonance modes appear in the transmission spectrum of the novel system. When the refractive index (n) of the dielectric, the width (ws) and center arc length (lC) (namely central angle (θ), outer radius (R) and inner radius (r)) of the cavity, and the gap distance (g) between cavity and waveguide are fixed and unfixed, the transmission spectrum is highly controlled with various θ, R and r, and tuned by adjusting the n, (R − r), θ, (R + r) or g, respectively. The coupled mode theory is employed to elucidate the spectral characteristic, which is in good agreement with the numerical simulation. It provides a promising way for realization of controllable or tunable transmission spectrum and for optimization of prospective structure size, and has potential application in nanoscale optical devices and integrated optics devices. It demonstrates a practical approach to design optical devices, which will satisfy different fabricating demands in future.
This work was supported by the National Natural Science Foundation of China under Grant no. 61275174 and the Postgraduate Technology Innovation Project of Central South University under Grant no. 2017zzts062.
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