Based on electromagnetic eigenequation in silver-coated microcylinder, we study its mode characteristics and sensing characteristics, including dispersion relation, quality factor (Q factor), sensitivity (S) and detection limit (DL). We find hybrid WGM-SPPs modes in energy distribution and mode coupling phenomenon in dispersion curve. In the vicinity of mode coupling point, hybrid TM-SPPs modes (or supermodes) have both high Q factor and high surface enhancement factor. Meanwhile the hybrid modes have high refractive sensitivity and figure of merit (FoM), which enables potential applications in chemical and biological sensing.
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