Optical Fano resonances in a nonconcentric nanoshell
- 25 March 2016
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 55 (10), 2611-8
- https://doi.org/10.1364/ao.55.002611
Abstract
The interaction of light with a metal nanoshell with an off-center core generates multipoles of all orders. We show here that the matrix elements used to compute the multipole expansion coefficients can be derived analytically and, with this result, we can show explicitly how the dipole and quadrupole terms in the expansion are coupled and give rise to a Fano resonance. We also show that the off-center core significantly increases the electric field enhancement at the shell surface compared to the concentric case, which can be exploited for surface-enhanced sensing. The multipole solutions are confirmed with finite-element calculations.Keywords
Funding Information
- Duke Faculty Exploratory Project
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