Differential extinction of vibrational molecular overtone transitions with gold nanorods and its role in surface enhanced near-IR absorption (SENIRA)

Daler R. Dadadzhanov, Tigran A. Vartanyan, Alina Karabchevsky

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Resonant coupling between plasmonic nanoantennas and molecular vibrational excitations is employed to amplify the weak overtone transitions that reside in the near-infrared. We explore for the first time the differential extinction of forbidden molecular overtone transitions coupled to the localized surface plasmons. We show a non-trivial interplay between the molecular absorption enhancement and suppression of plasmonic absorption in a coupled system. When the resonance conditions are met at 1.5 µm, two orders of magnitude enhancement of differential extinction as compared to the extinction of the same amount of free probe molecules is achieved. Our results pave a road toward a new class of surface enhanced near-infrared absorption-based sensors.

Original languageEnglish
Pages (from-to)29471-29478
Number of pages8
JournalOptics Express
Volume27
Issue number21
DOIs
StatePublished - 14 Oct 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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