Exploring plasmonic coupling in hole-cap arrays

Exploring plasmonic coupling in hole-cap arrays

The plasmonic coupling between gold caps and holes in thin films was investigated experimentally and through finite-difference time-domain (FDTD) calculations. Sparse colloidal lithography combined with a novel thermal treatment was used to control the vertical spacing between caps and hole arrays a...

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Bibliographic Details
Main Authors: Thomas M. Schmidt, Maj Frederiksen, Vladimir Bochenkov, Duncan S. Sutherland
Format: Article
Language:English
Published: Beilstein-Institut 2015-01-01
Series:Beilstein Journal of Nanotechnology
Subjects:
caps
colloidal lithography
hybridization
localized surface plasmon resonance
near field
SRO hole arrays
Online Access:https://doi.org/10.3762/bjnano.6.1
Description
Summary:The plasmonic coupling between gold caps and holes in thin films was investigated experimentally and through finite-difference time-domain (FDTD) calculations. Sparse colloidal lithography combined with a novel thermal treatment was used to control the vertical spacing between caps and hole arrays and compared to separated arrays of holes or caps. Optical spectroscopy and FDTD simulations reveal strong coupling between the gold caps and both Bloch Wave-surface plasmon polariton (BW-SPP) modes and localized surface plasmon resonance (LSPR)-type resonances in hole arrays when they are in close proximity. The interesting and complex coupling between caps and hole arrays reveals the details of the field distribution for these simple to fabricate structures.
ISSN:2190-4286

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