Abstract

We propose an ultrasmall plasmonic cavity consisting of a high-index/low-index dielectric nanorod covered with silver. Full three-dimensional subwavelength confinement of the surface-plasmon polaritons was achieved at the high-index dielectric–silver interface without propagating to the low-index dielectric–silver interface. The numerical simulations showed that the plasmonic mode excited in this cavity has a deep subwavelength mode volume of $0.0038(\lambda /2n{)}^3$ and a quality factor of 1500 at $40\mathrm{K}$, and consequently a large Purcell factor of $\sim 2\times {10}^5$. Therefore, this plasmonic cavity is expected to be useful for the demonstration of high-efficiency single photon sources or low-threshold lasers in an ultracompact nanophotonic circuit.

© 2011 Optical Society of America

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