Strong interaction of molecular vibrational overtones with near-guided surface plasmon polariton

Alina Karabchevsky, Atef Shalabney

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

Here, we report on the enhancement of molecular vibrational transitions overtones due to the excitation of surface plasmon polariton waves. We show that, assuming a modified Kretschmann-Reather configuration with ultra-thin dielectric over-layer, the effective absorption cross section of higher harmonics of molecular vibrations is boosted by at least two orders of magnitude. Based on the experimental observations reported by Karabchevsky and Kavokin [1] on photonic waveguides, we calculate the differential absorption which appears to exhibit a Fano-like line shape. This manifests the interaction between a narrow molecular resonance and a broad plasmonic mode. In fact, the interaction occurs due to the highest enhancement of the vibrational transitions overtones when the vibration mode and plasmonic mode are detuned. The enhancement factor reported in this study points on feasibility of vibrational overtones detection using conventional spectrometers. In addition, having high signal-to-noise ratio opens a new route for molecular detection and sensing.

Original languageEnglish
Title of host publicationOptical Sensing and Detection IV
EditorsFrancis Berghmans, Anna G. Mignani
PublisherSPIE
ISBN (Electronic)9781510601444
DOIs
StatePublished - 1 Jan 2016
EventOptical Sensing and Detection IV - Brussels, Belgium
Duration: 3 Apr 20167 Apr 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9899
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceOptical Sensing and Detection IV
Country/TerritoryBelgium
CityBrussels
Period3/04/167/04/16

Keywords

  • Fano resonances
  • Surface plasmon resonance
  • molecular vibrations overtones
  • vibrational spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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