Exciton polaritons in two-dimensional photonic crystals
Daniele Bajoni, Dario Gerace, Matteo Galli, Jacqueline Bloch, Remy, Braive, Isabelle Sagnes, Audrey Miard, Aristide Lema\^itre, Maddalena, Patrini, Lucio Claudio Andreani
TL;DR
This paper demonstrates strong exciton-photon coupling in 2D photonic crystals, showing controllable polariton dispersion and potential for entangled photon pair generation, supported by experimental and theoretical analysis.
Contribution
It provides experimental evidence and a quantum theoretical framework for exciton-polariton strong coupling in 2D photonic crystals, enabling dispersion control and quantum light sources.
Findings
Observation of anticrossing in spectra indicating strong coupling
Successful interpretation with quantum exciton-photon theory
Potential for entangled photon pair generation
Abstract
Experimental evidence of strong coupling between excitons confined in a quantum well and the photonic modes of a two-dimensional dielectric lattice is reported. Both resonant scattering and photoluminescence spectra at low temperature show the anticrossing of the polariton branches, fingerprint of strong coupling regime. The experiments are successfully interpreted in terms of a quantum theory of exciton-photon coupling in the investigated structure. These results show that the polariton dispersion can be tailored by properly varying the photonic crystal lattice parameter, which opens the possibility to obtain the generation of entangled photon pairs through polariton stimulated scattering.
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