Enhancing vibrational light-matter coupling strength beyond the molecular concentration limit using plasmonic arrays

Abstract

Vibrational strong coupling is emerging as a promising tool to modify molecular properties, by making use of hybrid light-matter states known as polaritons. Fabry-Perot cavities filled with organic molecules are typically used, and the molecular concentration limits the maximum reachable coupling strength. Developing methods to increase the coupling strength beyond the molecular concentration limit are highly desirable. In this letter, we investigate the effect of adding a gold nanorod array into a cavity containing pure organic molecules, using FT-IR microscopy and numerical modeling. Incorporation of the plasmonic nanorod array, that acts as artificial molecules, leads to an order of magnitude increase in the total coupling strength for the cavity filled with organic molecules. Additionally, we observe a significant narrowing of the plasmon linewidth inside the cavity. We anticipate that these results will be a step forward in exploring vibropolaritonic chemistry and may be used in plasmon based bio-sensors.

References in corpus (5)

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Cited by in corpus (5)

• Chiral Polaritonics: Analytic Solutions, Intuition and its Use
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• Controlling Plasmonic Catalysis via Strong Coupling with Electromagnetic Resonators
• Multiple vibro-polaritons formation from a thin polyethylene film embedded in a resonant mid-infrared cavity
• Making ab initio QED functional(s): Non-perturbative and photon-free effective frameworks for strong light-matter coupling