Effect of implementation of a Bragg reflector in the photonic band structure of the Suzuki-phase photonic crystal lattice

We investigate the change of the photonic band structure
of the Suzuki-phase photonic crystal lattice when the horizontal
mirror symmetry is broken by an underlying Bragg reflector. The
structure consists of an InP photonic crystal slab including four
InAsP quantum wells, a SiO2 bonding layer, and a bottom high index contrast Si/SiO2 Bragg mirror deposited on a Si wafer. Angle- and polarization-resolved photoluminescence spectroscopy has been used for measuring the photonic band structure and for investigating the coupling to a polarized plane wave in the far field. A drastic change in the k-space photonic dispersion between the structure with and without Bragg reflector is measured. An important enhancement on the photoluminescence emission up to seven times has been obtained for a nearly flat photonic band, which is characteristic of the Suzuki-phase lattice.