Evanescent field-assisted intensity modulation of surface-enhanced Raman scattering from a single plasmonic nanowire

Sruthi Polali, Danveer Singh, G. V.Pavan Kumar

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Abstract

In this paper, we experimentally show how polarization of evanescent optical fields can be used to modulate surface-enhanced Raman scattering (SERS) intensity from a chemically prepared, single silver nanowire. By systematically varying the input polarization between p and s polarization, we observed a modulation depth of 0.88 in SERS intensity. The scattered output light was polarized perpendicularly to the nanowire axis with a modulation depth of 0.90. Our method of SERS excitation of a single nanowire in total internal reflection geometry can be further utilized as an evanescent-mode nano-optical sensor, especially in cases where soft nanomaterials are employed for molecular detection.

Original languageEnglish
Article number195107
JournalJournal Physics D: Applied Physics
Volume46
Issue number19
DOIs
StatePublished - 15 May 2013
Externally publishedYes

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