Vacuum radiation and frequency-mixing in linear light-matter systems

Westerberg, N. , Prain, A., Faccio, D. and Öhberg, P. (2019) Vacuum radiation and frequency-mixing in linear light-matter systems. Journal of Physics Communications, 3(6), 065012. (doi: 10.1088/2399-6528/ab2ab2)

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Recent progress in photonics has led to a renewed interest in time-varying media that change on timescales comparable to the optical wave oscillation time. However, these studies typically overlook the role of material dispersion that will necessarily imply a delayed temporal response or, stated alternatively, a memory effect. We investigate the influence of the medium memory on a specific effect, i.e. the excitation of quantum vacuum radiation due to the temporal modulation. We construct a framework which reduces the problem to single-particle quantum mechanics, which we then use to study the quantum vacuum radiation. We find that the delayed temporal response changes the vacuum emission properties drastically: frequencies mix, something typically associated with nonlinear processes, despite the system being completely linear. Indeed, this effect is related to the parametric resonances of the light-matter system, and to the parametric driving of the system by frequencies present locally in the drive but not in its spectrum.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Prain, Dr Angus and Faccio, Professor Daniele and Westerberg, Dr Niclas
Authors: Westerberg, N., Prain, A., Faccio, D., and Öhberg, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics Communications
Publisher:IOP Publishing
ISSN (Online):2399-6528
Published Online:18 June 2019
First Published:First published in Journal of Physics Communications 3(6): 065012
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
303021Black Hole Superradiance in Rotating Fluids (SURF)Daniele FaccioEngineering and Physical Sciences Research Council (EPSRC)EP/P006078/2P&S - Physics & Astronomy
303359PhoQusDaniele FaccioEuropean Commission (EC)820392P&S - Physics & Astronomy