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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
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Dependence of plasmon coupling on curved interfaces.
Applied Optics
|October 20, 2017
Summary
Curved interfaces in nanoparticle dimers significantly alter optical responses. This study reveals how nanoparticle shape and arrangement tune plasmon resonance, offering new possibilities for optical device design.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Coupled plasmon systems offer tunable optical properties based on material, geometry, and dielectric environment.
- Nanoparticle dimers exhibit enhanced electromagnetic fields and altered surface plasmon resonance (SPR) compared to monomers.
Purpose of the Study:
- To investigate the impact of curved interfaces in nanoparticle dimers on their optical responses.
- To explore the tunability of longitudinal surface plasmon resonance (SPRL) through dimer geometry and interface curvature.
- To explain the observed phenomena using plasmon hybridization theory.
Main Methods:
- Utilizing gold nanorod (AuNR) and silver nanocube dimers with varying geometries.
- Simulating optical responses using finite-difference time-domain (FDTD) solutions.
- Analyzing the influence of incident light polarization and conductive coupling.
Main Results:
- AuNR dimers exhibit red/blueshift in SPRL depending on assembly type (end-to-end, side-by-side).
- Touching AuNR dimers show a blueshift from redshift due to conductive coupling when polarized along the gap.
- Curved interfaces stimulate additional plasmon resonance under specific polarization conditions.
- Silver nanocube dimers (sharp/smooth corners) demonstrate similar sensitivity to structural geometry.
Conclusions:
- Curved interfaces in nanoparticle dimers introduce a significant effect on optical responses.
- Plasmon hybridization theory effectively explains the observed resonance phenomena.
- Coupled plasmon resonance modes are highly sensitive to the precise structural geometry of nanoparticle dimers.
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