Article Dans Une Revue Photonics and Nanostructures - Fundamentals and Applications Année : 2024

Multiple micro-cavity vibro-polaritons formation with different vibrational bands of the methylene group

Résumé

We present an experimental technique to accurately predict the formation of vibro-polaritons from a molecular polymeric film embedded in a resonant mid-infrared cavity. Using simple Fourier-transform reflectance measurement, we extract the complex dielectric function of a polyethylene film using Kramers-Kronig relations. The fitted dielectric function can be plugged into a numerical code to predict the strength and dispersion of the strong light-matter coupling regime between the quantized electromagnetic modes of a microcavity and the vibrational bands of the molecules. As a demonstration, we experimentally resolve the simultaneous formation of multiple vibro-polariton modes issued from the strong coupling of some vibrational bands of the methylene group (CH2) in a 2.5-μm-thick polyethylene film embedded in a microcavity. We measure a Rabi splitting of 6.3 THz for the stretching doublet around 87.5 THz and a Rabi splitting of 1.1 THz for the scissoring doublet around 43.7 THz, in excellent agreement with numerical predictions.

Dates et versions

hal-04778184 , version 1 (12-11-2024)

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Mario Malerba, Mathieu Jeannin, Paul Goulain, Adel Bousseksou, Raffaele Colombelli, et al.. Multiple micro-cavity vibro-polaritons formation with different vibrational bands of the methylene group. Photonics and Nanostructures - Fundamentals and Applications, 2024, 61, pp.101294. ⟨10.1016/j.photonics.2024.101294⟩. ⟨hal-04778184⟩
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