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Nonlinear Cavity Response under Coherent Excitation: Numerical and Experimental Investigation (Orale)

Samuel Serna, Jérèmy Oden, Xavier Le Roux, Philippe Delaye, Éric Cassan, N. Dubreuil

Published Oct 18, 2015• 0 citations
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We report experimental and theoretical studies of the transient nonlinear response from semiconductor microcavities. We show that, in the nonperturbative regime, oscillations in time-integrated transient four-wave mixing do not correspond to normal mode oscillations of either the exciton or photon population in the cavity. Coherent nonlinear responses arising from band filling, excitation-induced dephasing, and renormalized electric fields feature highly distinctive dynamical behaviors. Coherent dynamics in transient four-wave mixing reflects interference between these nonlinear processes.

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Exciton-exciton correlation in the ultrafast nonlinear optical response in the nonperturbative regime

Salvatore Savasta, Omar Di Stefano, R. Girlanda

Summary form only given. The ultrafast nonlinear optical response of semiconductor-microcavities (SMCs) in the nonperturbative regime is attracting growing interest for exploring fundamental light-matter interactions in many-particle quantum systems, as well as for the future implementations of ultrafast photonic devices. In spite of many investigations, the coherent dynamics of excitonic nonlinear-response in the nonperturbative regime has not been fully understood. Open questions are how strong exciton-cavity coupling affects exciton-exciton (X-X) interactions, and how in turn the X-X correlation influences the nonlinear response of SmCs. We investigate these open questions and show that the nonperturbative regime provides an unprecedented tool for investigating four-particle correlations.We start from the equations for the third order exciton polarization and cavity field describing quantum optical effects and coherent nonlinear optics in SMCs, perform the semiclassical factorization and include multiple scattering processes.

Quantum Electronics and Laser Science Conference•Nov 13, 2002•0 citations
We report experimental and theoretical studies of the transient nonlinear response from semiconductor microcavities. We show that, in the nonperturbative regime, oscillations in time-integrated transient four-wave mixing do not correspond to normal mode oscillations of either the exciton or photon population in the cavity. Coherent nonlinear responses arising from band filling, excitation-induced dephasing, and renormalized electric fields feature highly distinctive dynamical behaviors. Coherent dynamics in transient four-wave mixing reflects interference between these nonlinear processes.
Stabilized Linked Observables in Nonlinear Coherent Quantum Media presents the development of a bounded nonlinear coherent-medium effective field theory constructed through iterative falsification, reconstruction, analytic derivation, and numerical stress testing. The work investigates whether coherent quantum media can support nonlinear response structures that remain ultraviolet bounded, dynamically coherent, finite-density localized, and experimentally falsifiable under increasingly restrictive analytic and numerical conditions. The framework evolved through multiple stages of development. Early polynomial nonlinear interactions produced ultraviolet Hamiltonian runaway and were discarded in favor of a stabilized saturating nonlinear structure. From the resulting bounded nonlinear response emerge linked condensate observables including phase-response extrema, sound-speed reversals, phonon-softening structure, modulational instability thresholds, unstable momentum bands, and nonlinear growth spectra. A central result of the framework is the emergence of a derivative-linked observable geometry in which multiple condensate properties arise from the same bounded nonlinear response structure rather than from independently adjustable fitting parameters. The work includes: analytic derivations, asymptotic stability analysis, nonlinear instability calculations, threshold studies, numerical evolution tests, conservation diagnostics, finite-noise ensemble studies, trapped-condensate simulations, coupled-component dynamics, lightweight three-dimensional stress tests, synthetic experimental falsification pipelines, and supplementary figures, tables, and appendices supporting the development of the framework. At its current stage, the framework should be interpreted as a theoretical nonlinear coherent-medium effective field theory candidate rather than an experimentally established physical model. The work is presented as a falsifiable analytic structure intended for further theoretical examination, numerical reproduction, and future experimental comparison through condensate interferometry, sound-speed measurements, and Bogoliubov spectroscopy.
Summary form only given. The ultrafast nonlinear optical response of semiconductor-microcavities (SMCs) in the nonperturbative regime is attracting growing interest for exploring fundamental light-matter interactions in many-particle quantum systems, as well as for the future implementations of ultrafast photonic devices. In spite of many investigations, the coherent dynamics of excitonic nonlinear-response in the nonperturbative regime has not been fully understood. Open questions are how strong exciton-cavity coupling affects exciton-exciton (X-X) interactions, and how in turn the X-X correlation influences the nonlinear response of SmCs. We investigate these open questions and show that the nonperturbative regime provides an unprecedented tool for investigating four-particle correlations.We start from the equations for the third order exciton polarization and cavity field describing quantum optical effects and coherent nonlinear optics in SMCs, perform the semiclassical factorization and include multiple scattering processes.