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Mode coupling characteristics in metal-coated microsphere are comprehensively studied by analytical method with Mie theory. The dispersion relation, field distribution and Q factor of the eigenmodes are calculated according to the modal eigenequation. In metal-coated microcavity, symmetric SPP mode can couple with asymmetric SPP mode and TM eigenmodes strongly at the different characteristic radius of microsphere. In the coupling range, the generated supermode possesses both high Q factor and high surface enhancement factor, which is expected to have many interesting potential applications. Furthermore, the sensitivity and figure of merit of supermode in biochemical sensing applications has been studied. The results show that both high sensitivity and large figure of merit can be achieved simultaneously.

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