This is because the increase of the refractive index causes the full width at half maximum (FWHM) of the resonant peaks of some modes to show an increasing trend, making the FOM decrease; others show a decreasing trend, making the FOM increase, and the increase or decrease of the FWHM of the resonant peak mainly depends on its excitation mechanism.
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A Potential Plasmonic Biosensor Based Asymmetric Metal Ring Cavity with Extremely Narrow Linewidth and High Sensitivity.
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