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Functionalized azo-carbazole compounds, when exposed to two interfering polarized coherent laser beams, show efficient mixed amplitude and phase recording ability, frequently accompanied with surface relief grating formation. The aim of the present work is to study the dynamics of grating recording in azo-carbazole compounds using 30 ps train of pulses (532 nm, 1.2 mJ). The build-up of diffraction...
Recent progress in research on optical fiber devices, especially optical fiber couplers (FCs) and optical fiber grating couplers (FGCs) are reviewed. Photonic crystal fiber couplers (PCFCs) have recently attracted attention, because of their new designs with holey states, namely with air hole remaining taper region
A grating was defined in a silicon nitride waveguide, using a combination of both conventional lithography and laser interference lithography. The structure was optically characterized in the 1520-1560 nm wavelength range by combining transmission measurements with the analysis of local out-of-plane scattered light, using a high-resolution infrared camera. From the measured power enhancement of the...
Recently, second harmonic (SH) generation and its enhancement in one-dimensional (1D) photonic bandgap (PBG) structures has received growing interest. The 1D PBG grating has been proposed as a mean to achieve enhanced SH conversion efficiency by using the combined effects of the increased mode density at the transmission band edge, strong field localization, and the phase matching condition
This paper addresses the issue of in-plane coupling into and out of circular-grating resonators with optical waveguides for all-optical switching applications. Two different designs are proposed: the first design consists in directly accessing the cavity with the waveguides. The second design is based on optimization with an evolutionary algorithm that randomly reshapes the gratings along the waveguides...
Influence of the gain saturation on the output performance of quantum-well heterostructures with modified distributed-feedback cavities is considered. Taking into account symmetrical boundary conditions, distribution of the electromagnetic field in the active region of the heterostructure laser diode with a phase-amplitude grating is determined. It is shown that both the output power of the source...
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