Strong light–matter interaction is usually achieved by embedding a gain medium in a high-quality (Q)-factor cavity made with thick external mirrors. The high reflectivity of the mirrors poses, therefore, a trade-off between pump radiation coupling efficiency and high Q-factor, thus preventing the use of optical cavities in photonic contexts where the photosensitive element necessitates to be readily accessible. Here, this long-standing problem is overcome by engineering “Pseudo-Cavity Modes” (PCM) in a Metal/Dielectric Open Cavity (MDOC) system that has been commonly thought to be incapable to show resonances. The MDOC system lets the embedded fluorophore exposed to radiation, opening to strong light/matter interaction. To prove this: i) exciton/PCM strong coupling regime, with 160 meV Rabi splitting, ii) photoluminescence enhancement by more than 7 times, and iii) polarized and angle-dependent spontaneous emission are experimentally and theoretically demonstrated. The proposed system holds great potential envisioning scenarios like cavity-enhanced photovoltaics, surface-enhanced Raman scattering, open-cavity lasers, photoluminescence steering and polarization.

Strong Light–Matter Interaction and Spontaneous Emission Reshaping via Pseudo-Cavity Modes

Patra A.;Caligiuri V.;De Luca A.
2021-01-01

Abstract

Strong light–matter interaction is usually achieved by embedding a gain medium in a high-quality (Q)-factor cavity made with thick external mirrors. The high reflectivity of the mirrors poses, therefore, a trade-off between pump radiation coupling efficiency and high Q-factor, thus preventing the use of optical cavities in photonic contexts where the photosensitive element necessitates to be readily accessible. Here, this long-standing problem is overcome by engineering “Pseudo-Cavity Modes” (PCM) in a Metal/Dielectric Open Cavity (MDOC) system that has been commonly thought to be incapable to show resonances. The MDOC system lets the embedded fluorophore exposed to radiation, opening to strong light/matter interaction. To prove this: i) exciton/PCM strong coupling regime, with 160 meV Rabi splitting, ii) photoluminescence enhancement by more than 7 times, and iii) polarized and angle-dependent spontaneous emission are experimentally and theoretically demonstrated. The proposed system holds great potential envisioning scenarios like cavity-enhanced photovoltaics, surface-enhanced Raman scattering, open-cavity lasers, photoluminescence steering and polarization.
2021
light–matter interaction
micro/nano resonators/cavities
open cavities
pseudo-cavity modes
Rabi splitting
spontaneous emission
strong coupling
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/326752
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