Photonic crystal QCLs
Photonic crystal QCLs
We design a surface emission QCL device using a photonic crystal. Instead of a grating, a photonic crystal is used to diffract light out of the surface. This laser operates at a band-egde of the energy-momentum space mode which is characterised by low group velocity region as a result of the optical feedback of the lattice.
Figure 1: Simulated magnetic field emission at the surface of photonic crystal QCLs.
Figure 2: SEM image of nano-structured QCLs.