Sommaire:

Photonic crystals have reshaped light-based technologies during the last few decades. Remarkably, some years ago Raghu and Haldane discovered that the light propagation in photonic crystals may depend on some global topological properties determined by the manner how the light states are entangled in the spectral domain. The standard topological classification of photonic crystals relies on the fact that these structures have a periodic structure. The periodicity is of vital importance to guarantee that the underlying wave vector space is a closed surface with no boundary.
In this talk, I will show that it is possible to calculate topological invariants of a wide class of bianisotropic nonreciprocal electromagnetic continua with no intrinsic periodicity. The nontrivial topology of the relevant materials will be linked to the emergence of topological edge states immune to back reflections. Furthermore, I will discuss rather general conditions under which a photonic platform can support propagation channels insensitive to backscattering, showing that systems invariant under the action of a PTD operator-the composition of the parity, time-reversal, and duality transformations-may enable bidirectional waveguiding totally insensitive to deformations, analogous to the spin-Hall effect, but for light waves. Finally, time permitting, I will discuss the consequences of a topological transport of light in the context of thermally generated radiation in a closed cavity at a thermodynamic equilibrium.

Pour plus d'informations, merci de contacter Rousseau E.