In-Plane and Out-of-Plane Investigation of Resonant Tunneling Polaritons in Metal-Dielectric-Metal Cavities.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36745481.
- Also identified by DOI 10.1021/acs.nanolett.2c04864 and PMC identifier 9951238.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Polaritons can be generated by tuning the optical transitions of a light emitter to the resonances of a photonic cavity. We show that a dye-doped cavity generates resonant tunneling polaritons with Epsilon-Near-Zero (ENZ) effective permittivity. We studied the polariton spectral dispersion in dye-doped metal-dielectric-metal (MDM) cavities as a function of the in-plane (<i>k</i><sub>||</sub>) and out-of-plane (<i>k</i><sub>⊥</sub>) components of the incident wavevector. The dependence on <i>k</i><sub>||</sub> was investigated through ellipsometry, revealing the ENZ modes. The <i>k</i><sub>⊥</sub> dependence was measured by varying the cavity thickness under normal incidence using a Surface Force Apparatus (SFA). Both methods revealed a large Rabi splitting well exceeding 100 meV. The SFA-based investigation highlighted the collective nature of strong coupling by producing a splitting proportional to the square root of the involved photons. This study demonstrates the possibility of generating ENZ polaritons and introduces the SFA as a powerful tool for the characterization of strong light-matter interactions.