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Topological effects are universal! The mathematical principles of topology can be applied not only to electrons, but also to many other physical systems. For example, opticalmicro-resonators were arranged like carbon atoms in a graphene layer. Optical micro-resonators are small lasers that here are connected to each other in a lattice. Through a combination of special optical properties and material characteristics, light (instead of electrons) is transmitted backscatter-free along the edge of a structure.
Send the Light Around the Corner!
In this model of an optical topological insulator, light can move around corners! You can see a honeycomb structure of optical resonators. The light is generated in the red quantum films by a laser and surrounded by black and white mirrors. The diameter of the turrets is actually only about two micrometers, much less than that of a human hair. The center is insulating so that light cannot spread there. It instead spreads out along the edge.
In the Lead!
In 2018, a group of researchers from the Technical Physics Chair in Würzburg designed for the first time a topological insulator for a special optical excitation – the exciton-polariton, a hybrid of light and matter.
