Abstract
Strongly hybridized plasmon-photon modes are observed in a microtubular cavity coated with a gold nanocap. Polarization-resolved measurements reveal that the transverse magnetic polarized light predominantly excites the hybrid resonant modes in these optoplasmonic microcavities. Remarkably, the exterior field of the hybrid mode is enhanced by more than an order of magnitude over previously reported designs and is caused by the light confinement in an extremely thin cavity wall. Both finite element method calculations and an effective potential approach confirm our experimental observations. Our work reveals the basic physical mechanisms responsible for exciting hybrid modes in optoplasmonic microcavities and as such is relevant for both fundamental and applied studies in photonics and plasmonics.
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