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We predict and show the existence of unlocked evanescent waves in two dimensional periodic structures. In a one dimensional periodic structure an evanescent mode are located either at the center or at the boundary of the Brillouin Zone, and the real part of wave-vectors is locked either to zero or to the modulation vector of the periodicity. However, we report an unexpected observation that this is...
Among nonlinear-phenomena in propagation trough a nonlinear stack, switching describes change from an evanescent mode to a cavity stack mode. We use the analysis of Winful to extend previous results of a 1D nonlinear Stack.
We discuss a 3D Spherical Dielectric Photonic Crystal with a Metallic Core. Previous works have shown a distinctive transmission characterization for such a system. We show a continuous evolution that is explained by its dispersion relation.
Two-dimensional photonic crystal lasers have been fabricated on III–V semiconductor slabs. Tuning of the spontaneous emission in micro and nanocavities has been achieved by accurate control of the slab thickness. Different structures, some of them of new application to photonic crystal lasers, have been fabricated like the Suzuki-phase or the coupled-cavity ring-like resonators. Laser emission has...
The challenge of making artificial photonic crystals has developed many top of the art fabrication methods. Many of these methods such as lithography or micromanipulation (Aoki et al., 2003), are so complete that they are not only restricted for crystal fabrication, but also being able to introduce very complex defects into otherwise ordered structures. Taking advantage of this freedom of design one...
We show that an omnidirectional point source embedded in a photonic crystal designed to possess a small and negative index of refraction becomes in a highly-directional beam because of the photonic crystal. The slab makes a filtering of high transverse wavevectors of the diverging beam. The predicted phenomenon is demonstrated at microwave frequencies (~13 GHz) using a two-dimensional photonic crystal...
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