Abstract

Electromagnetic vacuum engineering in nanostructures can be used to tailor the light–emitter interaction at the subwavelength scale. Here, by embedding a nanocavity quantum electrodynamic system in an evanescent vacuum, we theoretically investigate high-dielectric constant enhanced photon–exciton coupling. The evanescent depth decreases as the dielectric constant of the embedding medium increases. Thus, more confined evanescent fields are obtained owing to faster exponential decay of an evanescent wave, which is used to obtain a larger coupling coefficient enhancement. The enhanced coupling coefficients are also demonstrated by changing the Ag nanorod size and the gap distance between the nanoparticle and plate. To significantly enhance the absolute value of the coupling coefficients, the Ag cylindrical nanorod can be replaced by the Ag pyramid or bipyramid. Evanescent vacuum induced strong photon–exciton coupling would have a significant influence on the fundamental physics of the subwavelength-confined cavity quantum electrodynamics and on-chip quantum information processing and scalable quantum networks.

© 2018 Optical Society of America

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