Refractive-index sensitivities of hybrid surface-plasmon resonances for a core-shell circular silver nanotube sensor

Abstract

We study the scattering and absorption of an $H$-polarized plane electromagnetic wave by a circular silver nanotube in the visible range of wavelengths using the separation of variables. The computed spectra of the extinction cross section display several hybrid localized surface-plasmon resonances of the dipole and multipole type. Analytical equations are derived for their resonance wavelengths. Bulk refractive-index sensitivities of nanotube-based sensors are determined, showing higher values for multipole resonances.

© 2013 Optical Society of America

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