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Light-matter coupling

Light-matter coupling is a rapidly growing field encompassing all coupling between photonic modes and excitation modes of matter. In solid-state cavities, the light-matter interaction can be used to modify the nature of elementary excitations of matter via the formation of hybrid excitations of light and matter generically called polaritons [1]. Such an interaction is actively investigated in many areas such as in surface-plasmon resonators [2], excitonic transitions in semiconductors [3], metamaterials [4] and superconducting layers [5].

In our group we are looking at strong and ultrastrong light-matter coupling effects in solids both from a theoretical and an experimental perspective. In particular we are studying these effects in complex oxide cavities where there may be the possibility to induce changes in some macroscopic properties.

Some sketched examples of cavity designs within oxide heterostructures where the blue denotes the functional layer, the orange a filler layer and the grey a metallic layer. Different types of light-matter coupling can be achieved in each.

[1]. C. Weisbuch et al, Phys. Rev. Lett. 69, (1992)

[2]. J. Bellessa et al, Phys. Rev. Lett. 93, (2004)

[3]. K. Hennessy et al, Nature 445, (2007)

[4]. A. Bayer et al, Nano Lett. 17, (2017)

[5]. Y. Laplace et al, Phys. Rev. B 93, (2016)