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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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TL;DR: In this paper, a long-lived quantum-dot spin qubit coupled to a GaAs-based photonic crystal cavity was used to control the charge state of the InAs quantum dot using laser pulses.
Abstract: Using a long-lived quantum-dot spin qubit coupled to a GaAs-based photonic crystal cavity, researchers demonstrate complete quantum control of an electron spin qubit. By cleverly controlling the charge state of the InAs quantum dot using laser pulses, optical initialization, control and readout of an electron spin are achieved.
150 citations
TL;DR: In this article, the defect modes of cholesteric liquid crystals as photonic band gap materials were investigated and the wavelength and reflectivity of defect modes were analyzed in terms of the refractive index of defect layer.
Abstract: We investigate defect modes of cholesteric liquid crystals as photonic band gap materials. For normal incidence of light, cholesteric liquid crystals exhibit total reflection for the circular polarization with the same handedness as that of cholesteric helix. However, the other orthogonal component is completely transmitted. When we replace a thin layer of liquid crystal by an isotropic material as a defect, defect modes are induced for both polarizations of incident light. We analyze the wavelength and reflectivity of the defect modes in terms of the refractive index of defect layer. @S1063-651X~99!09312-5#
150 citations
TL;DR: Using advanced electron beam lithographic techniques, a series of novel bicomponent magnonic crystals which exhibit well-defined frequency bandgaps are fabricated, and it is observed that the bandgap width decreases with increasing permalloy stripe width, but increases with increasing cobalt stripe width.
Abstract: Just as a photonic crystal is a periodic composite composed of materials with different dielectric constants, its lesser known magnetic analogue, the magnonic crystal can be considered as a periodic composite comprising different magnetic materials. Magnonic crystals are excellent candidates for the fabrication of nanoscale microwave devices, as the wavelengths of magnons in magnonic crystals are orders of magnitude shorter than those of photons, of the same frequency, in photonic crystals. Using advanced electron beam lithographic techniques, we have fabricated a series of novel bicomponent magnonic crystals which exhibit well-defined frequency bandgaps. They are in the form of laterally patterned periodic arrays of alternating cobalt and permalloy stripes of various widths ranging from 150 to 500 nm. Investigations by Brillouin light scattering and computer modeling show that the dispersion spectrum of these crystals is strongly dependent on their structural dimensions. For instance, their first frequen...
150 citations
TL;DR: The operation principles of photonic hydrogel sensors are explained, syntheses of stimuli-responsive polymers are presented, and an overview of qualitative and quantitative readout technologies are provided.
149 citations
TL;DR: This work experimentally demonstrates ultrafast all-optical modulation using a micrometer-sized silicon photonic integrated device, permitting greater than 5 Gbit/s modulation of optical signals on a silicon chip.
Abstract: We experimentally demonstrate ultrafast all-optical modulation using a micrometer-sized silicon photonic integrated device. The device transmission is strongly modulated by photoexcited carriers generated by low-energy pump pulses. A p-i-n junction is integrated on the structure to permit control of the generated carrier lifetimes. When the junction is reverse biased, carriers are extracted from the device in a time as short as 50?ps, permitting greater than 5?Gbit?s modulation of optical signals on a silicon chip.
149 citations