Photonic states mixing beyond the plasmon hybridization model

A study is performed on a photonic-state mixing-pattern in an insulator-metal-insulator cylindrical silver nanoshell and its rich variations induced by changes in the geometry and dielectric media of the system, representing the combined influences of plasmon coupling strength and cavity effects. Th...

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Bibliographic Details
Published inJournal of applied physics Vol. 120; no. 4
Main Authors Suryadharma, Radius N. S., Iskandar, Alexander A., Tjia, May-On
Format Journal Article
LanguageEnglish
Published United States 28.07.2016
Subjects
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
CRYSTAL DEFECTS
CYLINDRICAL CONFIGURATION
DENSITY OF STATES
DIELECTRIC MATERIALS
HYBRIDIZATION
MIXING
PERMITTIVITY
PLASMONS
RED SHIFT
SILVER
SYMMETRY BREAKING
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Summary:A study is performed on a photonic-state mixing-pattern in an insulator-metal-insulator cylindrical silver nanoshell and its rich variations induced by changes in the geometry and dielectric media of the system, representing the combined influences of plasmon coupling strength and cavity effects. This study is performed in terms of the photonic local density of states (LDOS) calculated using the Green tensor method, in order to elucidate those combined effects. The energy profiles of LDOS inside the dielectric core are shown to exhibit consistently growing number of redshifted photonic states due to an enhanced plasmon coupling induced state mixing arising from decreased shell thickness, increased cavity size effect, and larger symmetry breaking effect induced by increased permittivity difference between the core and the background media. Further, an increase in cavity size leads to increased additional peaks that spread out toward the lower energy regime. A systematic analysis of those variations for a silver nanoshell with a fixed inner radius in vacuum background reveals a certain pattern of those growing number of redshifted states with an analytic expression for the corresponding energy downshifts, signifying a photonic state mixing scheme beyond the commonly adopted plasmon hybridization scheme. Finally, a remarkable correlation is demonstrated between the LDOS energy profiles outside the shell and the corresponding scattering efficiencies.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4959258