Differential extinction of Vibrational Molecular Overtone Transitions with Gold Nanorods and Non-Trivial Surface Enhanced Near-IR Absorption (SENIRA)

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

Research output: Contribution to journalArticlepeer-review

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 that a non-trivial interplay between the molecular absorption enhancement and suppression of plasmonic absorption in a coupled system gives rise to orders of magnitude enhancement of the probe molecule differential extinction. Our results pave a road toward a new class of surface-enhanced near-infrared absorption-based sensors.Comment: 12 pages, 6 figure
Original languageEnglish
JournalOptics Express
Volume27
StatePublished - 12 Apr 2019

Keywords

  • Physics - Optics

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