Plasmon Hybridization in Stacked Double Crescents Arrays Fabricated by Colloidal Lithography

We apply colloidal lithography to construct stacked nanocrescent dimer structures with an exact vertical alignment and a separation distance of approximately 10 nm. Highly ordered, large arrays of these nanostructures are accessible using nonclose-packed colloidal monolayers as masks. Spatially sepa...

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Bibliographic Details
Published in:Nano letters 2011-02, Vol.11 (2), p.446-454
Main Authors: Vogel, Nicolas, Fischer, Janina, Mohammadi, Reza, Retsch, Markus, Butt, Hans-Jürgen, Landfester, Katharina, Weiss, Clemens K, Kreiter, Max
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Colloids - chemistry
Computer Simulation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystallization - methods
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Equipment Design
Equipment Failure Analysis
Exact sciences and technology
Light
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Materials science
Methods of nanofabrication
Models, Chemical
Nanolithography
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - instrumentation
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Particle Size
Physics
Scattering, Radiation
Surface and interface electron states
Surface Plasmon Resonance - instrumentation
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Description
Summary:We apply colloidal lithography to construct stacked nanocrescent dimer structures with an exact vertical alignment and a separation distance of approximately 10 nm. Highly ordered, large arrays of these nanostructures are accessible using nonclose-packed colloidal monolayers as masks. Spatially separated nanocrescent dimers are obtained by application of spatially distributed colloids. The polarization dependent optical properties of the nanostructures are investigated in detail and compared to single crescents. The close proximity of the nanocrescents leads to a coupling process that gives rise to new optical resonances which can be described as linear superpositions of the individual crescents’ plasmonic modes. We apply a plasmon hybridization model to explain the spectral differences of all polarization dependent resonances and use geometric arguments to explain the respective shifts of the resonances. Theoretical calculations are performed to support the hybridization model and extend it to higher order resonances not resolved experimentally.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl103120s