NDLI: Plasmon Hybridization of the Concentric Aluminum Ring/Disk Nanocavities

Content Provider	Springer Nature Link
Author	Sun, Song Song Wang, Hong Yan Wang, Hui
Copyright Year	2016
Abstract	The extinction spectra and electric field distributions of the aluminum nanoring and nanocavity structures consisting of a concentric disk and a surrounding ring (CDSR) covered by the oxide layer are calculated using the discrete dipole approximation method. The nanoring structures have much stronger electric field and much larger enhanced electric field region than those of the individual disk structure. The plasmon resonance modes of the CDSR nanocavity can be comprehended by the plasmon hybridization, which is coupled by the dipolar resonance mode of the individual disk and the antibonding, bonding dipolar resonance modes of the nanoring. The enhanced electric field distributions corresponding to the super-radiant and sub-radiant plasmon resonance modes of the CDSR nanocavity illustrate that the much stronger enhanced electric fields appear on the nanoring structure’s outer surface and the gap between the inner surface and the inserted disk for sub-radiant plasmon resonance mode, while for the super-radiant plasmon resonance mode, the much stronger enhanced electric fields only appear in the gap between the inner surface and the inserted disk. The maximum intensity reaches ~10$^{6}$ because of the dipolar resonance mode hybridization effect. The positions of the plasmon peaks depend sensitively on the nanostructural parameters. The plasmon resonance peaks of the CDSR nanostructure can be tuned throughout the visible and near-infrared regions by changing the size of nanostructures. Therefore, the properties of the tunable plasmon resonance modes, the much stronger and much larger region electric fields, make the aluminum CDSR nanocavity become a significant potential substrate for biological sensing, molecular detection, and the surface-enhanced Raman scattering.
Starting Page	803
Ending Page	810
Page Count	8
File Format	PDF
ISSN	15571955
Journal	Plasmonics
Volume Number	12
Issue Number	3
e-ISSN	15571963
Language	English
Publisher	Springer US
Publisher Date	2016-07-16
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Localized surface plasmon resonance Aluminum CDSR nanocavity Aluminum nanoring Enhanced electric field Biotechnology Nanotechnology Biological and Medical Physics, Biophysics Biochemistry
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Biochemistry Biophysics Biotechnology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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