From dark to bright: First-order perturbation theory with analytical mode normalization for plasmonic nanoantenna arrays applied to refractive index sensing

Weiss, T., Mesch, M., Schäferling, M., Giessen, H., Langbein, W. ORCID: https://orcid.org/0000-0001-9786-1023 and Muljarov, E. A. ORCID: https://orcid.org/0000-0002-2878-4148 2016. From dark to bright: First-order perturbation theory with analytical mode normalization for plasmonic nanoantenna arrays applied to refractive index sensing. Physical Review Letters 116 (23) , 237401. 10.1103/PhysRevLett.116.237401

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Abstract

We present a first-order perturbation theory to calculate the frequency shift and linewidth change of photonic resonances in one- and two-dimensional periodic structures under modifications of the surrounding refractive index. Our method is based on the resonant state expansion, for which we extend the analytical mode normalization to periodic structures. We apply this theory to calculate the sensitivity of bright dipolar and much darker quadrupolar plasmonic modes by determining the maximum shift and optimal sensing volume.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	0031-9007
Date of First Compliant Deposit:	22 December 2016
Date of Acceptance:	15 April 2016
Last Modified:	06 Oct 2023 19:47
URI:	https://orca.cardiff.ac.uk/id/eprint/96463

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