Abstract
We find that electromagnetic waves can be guided at the edge of a three-dimensional photonic crystal in air. When the waveguide is defined by the intersection of two surface planes, the edge modes are associated with the corresponding surface bands. A simple cell counting approach is presented to describe the periodic evolution of the system with interesting interplays among edge, surface, and bulk states.
- Received 15 December 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.243901
© 2012 American Physical Society