Cavity-dressed materials

DIPC Seminars

Claudiu Genes, Max Planck Institute for the Science of Light, Germany
Donostia International Physics Center
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Cavity-dressed materials Confining light modes to small volumes (optical or microwave cavities, waveguides, optical fibers, plasmonic structures, etc.) provides a platform for strong coherent light-matter interactions even at the quantum level. This allows for the control of material properties such as charge conductivity or energy transfer, of optical nonlinearities and of quantum states of macroscopic solid state mechanical resonators. Electron-photon interactions in optical cavities can be used to engineer of systems exhibiting enhanced cooperativity [1] and optical nonlinearities. For organic materials, coupling of electronic resonances to plasmonic structures can lead to an increase in charge conductivity [2] owing to the delocalized nature of polaritonic hybrid light-matter states which renders them resilient to disorder [3]. More complex models including coupling of electrons to molecular vibrations and bulk phonons [4] reveal the role of the delocalized photon mode in the process of acceptor-donor Förster resonance energy [5]. Photon-phonon interactions in optomechanics occur via the radiation pressure effect and can be exploited to control the motion of solid-state-based mechanical resonators. A first technique employs the cavity self-cooling effect and can be improved by designing hybrid cavities with photonic crystal mirrors that inhibit re-heating [6]. A second technique employs an electronic feedback loop that can be either analytical (cold-damping) or designed via machine learning methods. Feedback techniques can be successfully applied to the simultaneous cooling of many mechanical resonances, i.e. for the partial refrigeration of a mechanical object subject to an external thermal bath [7]. References: [1] D. Plankensteiner, C. Sommer, H. Ritsch and C. Genes, Cavity antiresonance spectroscopy of dipole coupled subradiant arrays, Phys. Rev. Lett. 119, 093601 (2017). [2] E. Orgiu, J. George, J. Hutchison, E. Devaux, J. F. Dayen, B. Doudin, F. Stellacci, C. Genet, J. Schachenmayer, C. Genes, G. Pupillo, P. Samori and T. W. Ebbesen, Conductivity in organic semiconductors hybridized with the vacuum field, Nat. Mat. 14, 1123 (2015). [3] D. Haggenmüller, J. Schachenmayer, S. Schütz, C. Genes and G. Pupillo, Cavity enhanced transport of charge, Phys. Rev. Lett. 119, 223601 (2017). [4] M. Reitz, C. Sommer, B. Gurlek, V. Sandoghdar, D. Martin-Cano and C. Genes, Molecule-photon interactions in phononic environments, arxiv:1912.02635, (2019). [5] M. Reitz, C. Sommer and C. Genes, Langevin approach to quantum optics with molecules, Phys. Rev. Lett. 122, 203602 (2019). [6] O. Cernotik, A. Dantan and C. Genes, Cavity quantum electrodynamics with frequency-dependent reflectors, Phys. Rev. Lett. 122, 243601 (2019). [7] C. Sommer and C. Genes, Partial optomechanical refrigeration via multi- mode cold damping feedback, Phys. Rev. Lett. 123, 203605 (2019). Host: Ricardo Díez Muiño