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Field-enhanced infrared molecular spectroscopy has been widely applied inchemical analysis, environment monitoring, and food and drug safety. Thesensitivity of molecular spectroscopy critically depends on the electromagneticfield confinement and enhancement in the sensing elements. Here we propose aconcept for sensing, consisting of a graphene plasmonic nanoresonator separatedfrom a metallic film by a nanometric spacer. Such a resonator can supportacoustic graphene plasmons, AGPs; that provide ultra-confined electromagneticfields and strong field enhancement. Compared to conventional plasmons ingraphene, AGPs exhibit a much higher spontaneous emission rate, highersensitivity to the dielectric permittivity inside the AGP nano resonator, andremarkable capability to enhance molecular vibrational fingerprints, ofnanoscale analyte samples. Our work opens novel avenues for sensing ofultra-small volume of molecules, as well as for studying enhanced light-matterinteraction, e.g. strong coupling applications.

Acoustic Graphene Plasmon Nanoresonators for Field Enhanced Infrared Molecular Spectroscopy