Shaped light waves penetrate further into photonic crystals – Physics WorldNew functionalities should be possible, however, if light can be controllably steered anywhere inside the crystals, beyond the depth set by Bragg interference. They began by directing unstructured, random, plane light waves onto the crystals and imaging the light that leaks through the structures’ top surface. “Such 3D control of light transport could be exploited for exotic light hopping across a lattice of cavities inside these crystals,” Uppu tells Physics World. Since the observed phenomena are essentially exploiting wave interference, the team is confident that their results can be generalized to electron waves, magnetic spin waves or even sound waves. To date, all these applications have been static, because the structure of the crystals (and thus the path of the light transported within them) is fixed. By programming the shapes, they managed to steer the waves into otherwise forbidden gaps in the crystal, travelling up to eight times the Bragg length. What is more, by programming the wavefronts correctly, they could interfere the waves such that their intensity concentrates at a single location deep inside the crystals.
Article from physicsworld.com.