Optical Fano resonances in a nonconcentric nanoshell.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Norton, SJ; Vo-Dinh, T

Published Date

  • April 2016

Published In

Volume / Issue

  • 55 / 10

Start / End Page

  • 2611 - 2618

PubMed ID

  • 27139663

Electronic International Standard Serial Number (EISSN)

  • 1539-4522

International Standard Serial Number (ISSN)

  • 1559-128X

Digital Object Identifier (DOI)

  • 10.1364/ao.55.002611


  • eng