Abstract
Abstract Plasmonic structures are known to support the modes with sub-wavelength volumes in which the field/matter interactions are greatly enhanced. Coupling between the molecular excitations and plasmons leading to the formation of “plexcitons” has been investigated for a number of organic molecules. However, plasmon-exciton coupling in metal/semiconductor structures has not experienced the same degree of attention. In this work, we show that the “very strong coupling” regime in which the Rabi energy exceeds the exciton binding energy is attainable in semiconductor-cladded plasmonic nanoparticles and leads to the formation of Wannier exciton-plasmon polariton (WEPP), which is bound to the metal nanoparticle and characterized by dramatically smaller (by a factor of a few) excitonic radius and correspondingly higher ionization energy. This higher ionization energy, which exceeding approaches 100 meV for the CdS/Ag structures, may make room-temperature Bose-Einstein condensation and polariton lasing in plasmonic/semiconductor structures possible.
Highlights
Polaritons [1] are bosonic quasi-particles formed by photons and matter excitations such as phonons [2], excitons [3, 4], intersubband transitions [5], or others
We show that the “very strong coupling” regime in which the Rabi energy exceeds the exciton binding energy is attainable in semiconductor-cladded plasmonic nanoparticles and leads to the formation of Wannier exciton-plasmon polariton (WEPP), which is bound to the metal nanoparticle and characterized by dramatically smaller excitonic radius and correspondingly higher ionization energy
We considered the very strong coupling (VSC) between the Wannier exciton in semiconductor and localized surface plasmon (LSP)
Summary
Polaritons [1] are bosonic quasi-particles formed by photons and matter excitations such as phonons [2], excitons [3, 4], intersubband transitions [5], or others. In recent years, the attention of the polaritonic community had been turned in the direction of plasmonic structures, which enable localized surface plasmon (LSP) modes whose volume is far below the diffraction limit (V <
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