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Rovibrational Polaritons in Gas-Phase Methane

Adam D. WrightJane C. NelsonMarissa L. Weichman
Dec 2022
摘要
Polaritonic states arise when a bright optical transition of a molecularensemble is resonantly matched to an optical cavity mode frequency. Here, welay the groundwork to study the behavior of polaritons in clean, isolatedsystems by establishing a new platform for vibrational strong coupling ingas-phase molecules. We access the strong coupling regime in an intracavitycryogenic buffer gas cell optimized for the preparation of simultaneously coldand dense ensembles, and report a proof-of-principle demonstration in gas-phasemethane. We strongly cavity-couple individual rovibrational transitions andprobe a range of coupling strengths and detunings. We reproduce our findingswith classical cavity transmission simulations in the presence of strongintracavity absorbers. This infrastructure provides a new testbed for benchmarkstudies of cavity-altered chemistry.
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