Topic
Photonic crystal
About: Photonic crystal is a research topic. Over the lifetime, 43424 publications have been published within this topic receiving 887083 citations.
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TL;DR: In this paper, the edge states in two-dimensional photonic crystals arising from a singular point in $k$ space at which two dispersion surfaces intersect are studied. But the edge state is not directly comparable to the electronic ones in graphene nanoribbons.
Abstract: We study the edge states in two-dimensional photonic crystals arising from a singular point in $k$ space at which two dispersion surfaces intersect. The zigzag edge states in a honeycomb lattice for TM polarization are analogous to the electronic ones in graphene nanoribbons. Electromagnetic modes at the zigzag edges of such photonic crystals consisting of ferrite rods are allowed to propagate only along one direction. The one-way propagation is insensitive to imperfections on the zigzag edge.
166 citations
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24 Jan 2003
TL;DR: In this article, the authors provide methods and compositions for identification and counterfit deterrence using non-holographic micro-optics and microstructures having a surface relief greater than a few microns.
Abstract: The present invention provides methods and compositions for identification and counterfit deterrence using non-holographic micro-optics and microstructures having a surface relief greater than a few microns. Embodiments of the present invention disclose a range of distinctive optical effects obtained from micro-optic systems incorporating micro lenses (35), non-imaging collectors (31), prisms, wave guides, mirrors (68), gratings, structural interference filters, and photonic crystal microstructures.
165 citations
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TL;DR: In this article, the authors provide design guidelines for creating 3D photonic crystals with a complete photonic band gap from block copolymer systems and other self-organizing systems.
Abstract: Band structures of three dimensionally periodic bi- and tricontinuous cubic structures have been calculated using the plane-wave method for solving Maxwell's equations. In particular, we consider the single primitive, single diamond, single gyroid, double primitive, double gyroid, and double diamond level surface families as examples of such structures found in self-organizing systems. We also provide design guidelines for creating three-dimensional photonic crystals with a complete photonic band gap from block copolymer systems and other self-organizing systems.
165 citations
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TL;DR: In this article, a discrete number of Bloch surface-localized eigenstates can exist inside the continuum of free-space modes, but the forward and back-reflected leakage may interfere destructively to create a perfectly bound surface state.
Abstract: From detailed numerical calculations, we demonstrate that in simple photonic crystal structures, a discrete number of Bloch surface-localized eigenstates can exist inside the continuum of free-space modes. Coupling to the free space causes the surface modes to leak, but the forward and back-reflected leakage may interfere destructively to create a perfectly bound surface state with zero leakage. We perform analytical temporal coupled-mode theory analysis to show the generality of such phenomenon and its robustness from variations of system parameters. Periodicity, time-reversal invariance, two-fold rotational symmetry and a perfectly reflecting boundary are necessary for these unique states. Inside the periodic structure of a photonic crystal, photons behave analogously to electrons in solid-state materials. Localized light patterns can be found at the interface between a photonic crystal and the surrounding air. Such surface states can exist even when the light has a possibility of escaping into the air, as Marin Soljacic and co-workers at the Massachusetts Institute of Technology and Harvard University, USA, now show in a theoretical study. They demonstrate that under certain conditions, different leakage channels from the crystal surface interfere destructively and thus cancel each other completely. These findings should help in the design of photonic-crystal structures for applications such as sensing and spectroscopy, where strongly localized light states are desired.
165 citations
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TL;DR: In this article, the authors investigated the coupling of photonic crystal (PC) linear three-hole defect cavities to PC waveguides and showed that up to 90% coupling efficiency can be obtained when the cavity is tilted by 60° with respect to the waveguide axis.
Abstract: Coupling of photonic crystal (PC) linear three-hole defect cavities to PC waveguides is theoretically and experimentally investigated. The systems are designed to increase the overlap between the evanescent cavity field and the waveguide mode and to operate in the linear dispersion region of the waveguide. The simulations indicate increased coupling when the cavity is tilted by 60° with respect to the waveguide axis, which was also confirmed by experiments. Up to 90% coupling efficiency into the waveguide was obtained.
165 citations