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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.

Simulated magnetic field emission at the surface of photonic crystal QCLs
Figure 1: Simulated magnetic field emission at the surface of photonic crystal QCLs.
 
 
SEM image of nano-structured QCLs
Figure 2: SEM image of nano-structured QCLs.