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Boosting Optical Nanocavity Coupling by Retardation Matching to Dark Modes.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Huang, Junyang 
Kos, Dean 
Elliott, Eoin 

Abstract

Plasmonic nanoantennas can focus light at nanometer length scales providing intense field enhancements. For the tightest optical confinements (0.5-5 nm) achieved in plasmonic gaps, the gap spacing, refractive index, and facet width play a dominant role in determining the optical properties making tuning through antenna shape challenging. We show here that controlling the surrounding refractive index instead allows both efficient frequency tuning and enhanced in-/output coupling through retardation matching as this allows dark modes to become optically active, improving widespread functionalities.

Description

Keywords

plasmonics, NPoM, impedance matching, dark modes, SERS

Journal Title

ACS Photonics

Conference Name

Journal ISSN

2330-4022
2330-4022

Volume Title

10

Publisher

American Chemical Society (ACS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/L015978/1)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (829067)
Engineering and Physical Sciences Research Council (EP/S022953/1)
European Commission Horizon 2020 (H2020) Research Infrastructures (RI) (861950)
European Commission Horizon 2020 (H2020) ERC (883703)