Light absorption and emission control in symmetry broken heterogeneous metasurfaces

1. Seassal, H-S. Nguyen, R. Mermet-Lyaudoz, N.H.M. Dang, E. Drouard, C. Chevalier, J.L. Leclercq, E. Fourmod, S. Cueff, F. Dubois, L. Berguiga, X. Letartre, P. Viktorovitch

INL, Institut des Nanotechnologies de Lyon, Université de Lyon, CNRS, Ecole Centrale de Lyon, INSA Lyon, France.

Combining active optical materials like inorganic functional oxides or hybrid perovskites with photonic crystals or high refractive index contrast gratings is expected to generate novel photonic media with extend functionalities, in particular in the visible range. On the one hand, the properties of these active metasurfaces can benefit from the fine control of the dispersion characteristics which can be achieved by introducing a controlled asymmetry in the nanophotonic patterns; the potentialities offered by this degree of freedom will be specifically illustrated in the case of light-emitting structures. On the other hand, the great diversity of optical materials which can be combined with these photonic patterns makes it possible to envisage applications as diverse as visible light communication, depollution, solar fuel generation or future polaritonic devices.

In this talk, the properties of the basic building block constituted by an optical material vertically stacked with a photonic pattern will be introduced. The way towards the control of the dispersion characteristics, including flat photonic bands, but also Dirac cones, M- or W-shaped and ultra-flat bands will then be presented. The properties enabled by integrating a high oscillator strength material like organic-inorganic hybrid perovskites in such photonic media will then be discussed, with a view to develop solar cells, LEDs, lasers, but also a novel platform for polaritonic devices. Lastly, we will show how such active metasurfaces could be used in the UV range when combined with photocatalysts.