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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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Journal ArticleDOI
TL;DR: The results showed that the bilayer architecture, rather than enhanced light harvesting within the inverse opal structures, is responsible for the bulk of the gain in IPCE.
Abstract: The mechanism of enhancing the light harvesting efficiency of dye-sensitized TiO2 solar cells by coupling TiO2 inverse opals or disordered scattering layers to conventional nanocrystalline TiO2 films has been investigated. Monochromatic incident photon-to-current conversion efficiency (IPCE) at dye-sensitized TiO2 inverse opals of varying stop band wavelengths and at disordered titania films was compared to the IPCE at bilayers of these structures coupled to nanocrystalline TiO2 films and to the IPCE at nanocrystalline TiO2 electrodes. The results showed that the bilayer architecture, rather than enhanced light harvesting within the inverse opal structures, is responsible for the bulk of the gain in IPCE. Several mechanisms of light interaction in these structures, including localization of heavy photons near the edges of a photonic gap, Bragg diffraction in the periodic lattice, and multiple scattering events at disordered regions in the photonic crystal or at disordered films, lead ultimately to enhance...

276 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate how to design a 90° bend in a two-dimensional photonic crystal waveguide with a transmission loss of less than 0.3% in almost the entire frequency range of the guided mode.
Abstract: Topology optimization is a promising method for systematic design of optical devices. As an example, we demonstrate how the method can be used to design a 90° bend in a two-dimensional photonic crystal waveguide with a transmission loss of less than 0.3% in almost the entire frequency range of the guided mode. The method can directly be applied to the design of other optical devices, e.g., multiplexers and wave splitters, with optimized performance.

275 citations

Journal ArticleDOI
TL;DR: In this paper, a photonic analogue of a three-dimensional solid-state topological insulator is proposed, where the symmetries may protect single Dirac cones on the surface of a photonics crystal.
Abstract: Crystal symmetries may protect single Dirac cones on the surface of a photonic crystal, creating a photonic analogue of a three-dimensional solid-state topological insulator.

275 citations

Journal ArticleDOI
TL;DR: In this paper, the authors quantitatively analyzed the origin of the loss spectrum shape using a photon Green function theory and obtained a very good agreement, thus providing an explanation of the complex physical mechanisms responsible for the observed propagation loss.
Abstract: Detailed propagation loss spectrum measurements for line-defect waveguides in silicon photonic crystal slabs are presented, which show record low loss values $(5\phantom{\rule{0.3em}{0ex}}\mathrm{dB}∕\mathrm{cm})$ and complicated frequency dependence. We quantitatively analyze the origin of the loss spectrum shape using a photon Green function theory and obtain a very good agreement, thus providing an explanation of the complex physical mechanisms responsible for the observed propagation loss. In particular, we demonstrate the influence of out-plane, backward, intermode, and in-plane scattering processes on the observed loss spectra, induced by the structural disorder that occurs during fabrication, and highlight the importance of backward and intermode scattering in these waveguides.

275 citations

Journal ArticleDOI
TL;DR: Using photonic crystal cavities with a buried heterostructure design, the authors demonstrated all-optical RAM at power levels 300 times lower than previous attempts, which could enable low-power large-scale optical RAM systems for handling high-bit-rate optical signals.
Abstract: Using photonic crystal cavities with a buried heterostructure design, scientists demonstrate all-optical RAM at power levels 300 times lower than previous attempts. The 30 nW devices could enable low-power large-scale optical RAM systems for handling high-bit-rate optical signals.

274 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023748
20221,590
20211,207
20201,455
20191,643
20181,683