Broadband and compact 2-D photonic crystal reflectors with controllable polarization dependence

Abstract

Two-dimensional (2-D) compact photonic crystal reflectors on suspended InP membranes were studied under normal incidence. We report the first experimental demonstration of 2-D broadband reflectors (experimental stopband superior to 200 nm, theoretical stopband of 350 nm). They are based on the coupling of free space waves with two slow Bloch modes of the crystal. Moreover, they present a very strong sensitivity of the polarization dependence, when modifying their geometry. A compact (50 50 m 2) demonstrator was realized and characterized, behaving either as a broadband reflector or as a broadband transmitter, depending on the polarization of the incident wave. Experimental results are in good agreement with numerical simulations.

3D harnessing of light with 2.5D photonic crystals

“…For example, very compact passive reflectors showing a large bandwidth (a few hundreds of nanometers) and consisting in a 2D PC formed in an InP membrane suspended in air have been reported. The large bandwidth is obtained for specific designs of the 2D PC, which allow, among other features, for a very strong coupling rate 1 c of waveguided modes with the radiation continuum [27,28].…”

Processing of photonic crystals in InP membranes by focused ion beam milling and plasma etching

“…Polarization selectivity can be added to these spectral membrane filters by introducing a periodic structure. InP/air-gap polarizers with Photonic Crystal membrane are based on the guided-mode resonance effect and exhibit polarization dependent coupling properties due to non-symmetric features, like elliptical base elements in a square lattice [5,6].…”

Broadband compact reflector based on all-dielectric subwavelength nanoparticle chains: reflecting lights beyond normal incidence with a very high reflectivity

“…However, in the infrared and visible light region, losses from mirrors are inevitable and may severely limit the performance of reflector-based devices. To avoid metallic losses, much effort has been devoted to the area of total or anomalous reflection based on all-dielectric structures, such as conventional distributed Bragg reflectors, bandgap-based photonic crystal, [1][2][3][4] and resonant gratings. 5 However, they suffer from issues of scale (too large), due to periodicity, or frequency (too narrow), due to the resonance effect.…”