Abstract
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 SiO(2) bonding layer, and a bottom high index contrast Si/SiO(2) 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.
Highlights
Since the discovery that certain periodic structures can confine the light, photonic crystals (PC) [1, 2] have been deeply studied due to the possibility of accurate control of the light at the wavelength scale [3, 4]
Particular interest has been devoted to the use of two-dimensional photonic crystal slabs (2D-PCs) for the development of such building blocks of the future integrated photonic circuits [5] as photonic crystal lasers [6, 7, 8] and photonic crystal waveguides [9, 10]
We study the actual effect of the Bragg mirror on the photonic bands
Summary
Since the discovery that certain periodic structures can confine the light, photonic crystals (PC) [1, 2] have been deeply studied due to the possibility of accurate control of the light at the wavelength scale [3, 4]. The combination of a Bragg reflector with an active 2D-PC slab can enhance the quality factor of the resonant mode giving rise to a decreasing of the lasing threshold [11, 12]. In this way, we study the actual effect of the Bragg mirror on the photonic bands. The Suzuki lattice belongs to a set of 2D structures, like the graphite and the Archimedean lattices [16, 17], which possess a basis made of several rods per unit cell All these lattices seem to support several lowdispersive photonic bands, similar to coupled cavity arrays [18]. An important enhancement of the intensity of the photoluminescense (PL) emission between four and seven times for one particular photonic band was measured
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