Dispersion characteristics of face modes in ionic-crystal and plasmonic-metal nanoparticles
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Authors
Collins, SM
Publication Date
2018Journal Title
Physical Review B
ISSN
2469-9950
Publisher
American Physical Society (APS)
Volume
97
Issue
24
Type
Article
Metadata
Show full item recordCitation
Collins, S. (2018). Dispersion characteristics of face modes in ionic-crystal and plasmonic-metal nanoparticles. Physical Review B, 97 (24) https://doi.org/10.1103/PhysRevB.97.245422
Abstract
Shape-dependent modes dominate the optical states of nanoparticles in the infrared spectra of ionic crystals and in the visible spectra of plasmonic metals. Here, the characteristic dispersion, or the shift in energy associated with the spatial period of surface charge oscillations, of surface modes governed by charges on the faces of prismatic nanoparticles is shown to follow the same form as the dispersion of the antisymmetric and cavity modes of infinite thin films and cylinders. Examination of the quasi-static eigenmodes of cubic particles with and without an internal octahedral cavity reveals the origins of this antisymmetric character and demonstrates self-coupling in the particles
containing cavities. In these particles, interactions between the face and cavity modes give rise to distinctive optical states at energies approaching the longitudinal optical phonon frequency in ionic crystals or the bulk plasma frequency in metal nanoparticles.
Sponsorship
Henslow Research Fellowship, Girton College, Cambridge
Identifiers
External DOI: https://doi.org/10.1103/PhysRevB.97.245422
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283515
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