The influence on photonic crystal waveguide properties of the fabrication-induced disorder was numerically studied.
By comparing the transmission spectra obtained using 3D-FDTD for four kinds of fabrication disorders, it was
shown that disorder modifies the waveguide mode properties, especially in the slow light regime. Emphasis was put
on the influence of the disorder localization. Results have shown the major role played by technological fluctuations
of the size, shape, and position of the two first rows of holes along PhC waveguide axis. Results have revealed that
bandgap properties remain almost unaffected even for huge disorder levels provided that the two first rows of holes
remain unchanged. Interestingly, 3D-simulation have also shown that sharp transmission spectrum cutoffs that
characteristize slow wave modes in the two-dimensional PhC bandgap are then not suppressed by the introduction of
disorder but are only blue-shifted. This point constitutes an interesting result for optical integrated devices relying on
low group velocity phenomena.
Flat band slow light with large bandwidth and low GVD in a novel PC waveguide is investigated. By using only one
tuning parameter with respect to a simple W1 waveguide, unusual "U" type ng-frequency curves are obtained, enabling a
versatile control of light group index and bandwidth. Delay-bandwidth products have been estimated for the proposed
waveguide geometry (0.1363 for ng = 211 < DPBs < 0.336 for ng=11) and can be faborably compared with values
reported in previous works. The GVD properties of the proposed structure have been also analyzed. It turns out that
nearly-zero dispersion waveguiding can be achieved within the constant high ng range. Addtionnaly, the new waveguide
allows a versatile control of positive or negative GVD values, opening opportunities for dispersion compensation
devices. Finally, the novel simple PC waveguide is relatively easy for fabrication if compared with previously proposed
solutions. Possible applications of the proposed δx PC waveguides can be found in optical interconnects, nonlinear
optics, or biophotonics.
We describe two Si based optical-electric modulators based on photonic crystals (PC), which are capable of monolithically integrated with Si photonic integrated circuits. One is a modulator based on Mach-Zehnder interferometer (MZI), the other is a modulator based on photonic band gap. These devices may enable the deployment of ultra-compact (-200 μm) devices with high extinction ration and low insertion loss.
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