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Showing 1 to 17 of 17 for “"optical nonlinearity"”.
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Silica Fiber with Large and Thermodynamically Stable Second Order Optical Nonlinearity
… by depositing a regular fused-silica fiber with optical nonlinear molecules, strong and thermodynamically stable SHG can be obtained. Our experiments also provide strong evidence for the theory. Start from the basic Maxwell equation, we derive the SHG efficiency that the excited power translates …
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Second-order nonlinear optical interactions and cascading effects in thinorganic films
… of the dyes possessing second order nonlinear-optical properties are proposed. The work shows how nonlinear-optical processes in such structures can be implemented by electro-optical and opto-optical control circuit signals. In this paper we consider the complete cycle of fabrication of several …
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Development of non-linear waveguide devices for optical signal processing
… poling, a technique which produces second-order optical nonlinearity in glass. Poling of glass has drawn much attention because frequency conversion and electro-optic modulation, operations which are typically restricted to crystals, becomes feasible in glass fibres and waveguides which are …
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OPTICAL BISTABILITY IN ZINC-SULFIDE AND ZINC-SELENIDE THIN-FILM INTERFERENCE FILTERS AND IN GALLIUM-ARSENIDE AND COPPER-CHLORIDE ETALONS (NONLINEAR).
Two-photon optical bistability in commercial thin-film interference filters with ZnS and ZnSe spacers is observed with switching times ≳ 200 μs. The accompanying drifting of the bistability loop in time and laser-induced "damage" indicate a thermal mechanism. The problem of water vapor absorption …
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Strategies to Enhance Performance of Solar Driven Desalination
… the inherent but previously unrecognized optical nonlinearity and resonant heat recovery should enable the design of substantially higher-throughput solar thermal desalination methods. These mechanisms are capable of enhancing a far wider range of photothermally driven processes as …
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Chalcogenide Glass on Layered van der Waals Crystals for Integrated Photonic Devices
… photonic devices with their varied and tunable optical properties. They can be integrated into planar photonic devices on virtually any substrate due to their van der Waals bonding, thereby introducing desirable material properties to existing integrated photonic platforms. Previously, their …
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Photonics for technology : circuits, chip-scale LIDAR, and optical neural networks
… one-way modes, integrated photonic LIDAR, and optical neural networks. First, we numerically investigate large Chern numbers in photonic crystals and explore their origin from simultaneously gapping multiple band degeneracies. Following this, we perform microwave transmission measurements in …
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Structure–Property Relationships in Hybrid Crystalline Materials for Multifunctional Light–Matter Interactions
… is intense enough. This phenomenon, known as optical nonlinearity, is at the heart of modern technologies that generate new colors of light, process information at ultrafast speeds, and enable quantum communication. However, finding materials that exhibit strong and stable nonlinear responses …
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Polarization characterization of nonlinear laser propagation
… gases such as N2 and O2, an extra component of optical nonlinearity due to the delayed rotational response (molecular alignment) is present which has been shown to have an effect on propagation and properties of the filament. Instabilities of the polarization of the filament lead to observation …
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Modification of glasses and optical waveguides using high electric fields
… The fundamental research on poling induced nonlinearity has been extended to investigate several compositions of Bi<sub>2</sub>O<sub>3</sub>ZnOB<sub>2</sub>O<sub>3</sub> glass systems, whose refractive index is measured to increase with the Bi<sub>2</sub>O<sub>3</sub> content. Intrinsic …
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Chemical Structure - Nonlinear Optical Property Relationships For A Series Of Two-photon Absorbing Fluorene Molecules
… current and emerging technologies exploit this optical nonlinearity including two-photon fluorescence imaging, three-dimensional microfabrication, site-specific photodynamic cancer therapy and biological caging studies. The two key features of this nonlinearity which make it an ideal candidate …
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Stimulated Brillouin scattering in an on-chip microdisk resonator
… are three waves involved in the process: two optical waves (pump and scattered light) and one acoustic wave, and the scattering process is restricted through the conservation of momentum and energy. Stimulated Brillouin Scattering (SBS) occurs when the interference between the pump and …
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Optical nonlinear effects and photon pair production in modulated materials
… the refractive index through the second order nonlinearity of the medium. We show that the key condition for this approach is that the medium is subwavelength in thickness. This leads to a temporal modulation of the refractive index. We use a mechanically exfoliated MoS2 monolayer. We present a …
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Control of Exciton Photon Coupling in Nano-structures
… the polaritons has also been observed with a low optical pump threshold. </p> <p>Exictons in organic semiconductors (modeled as Frenkel excitons) are tightly bound to molecular sites, and differ considerably from loosely bound hydrogen atom-like inorganic excitons (modeled as Wannier-Mott …
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Radiation Pressure induced Nonlinearity in Micro-droplet
Optical resonators such as silica micro-spheres and micro-toroids can support whispering gallery modes (WGMs), where light circulates near the resonator surface and is confined by the total internal reflection at the dielectric boundary. Such resonators can exhibit very high quality (Q) factors, …
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Nonlinear Applications using Silicon Nanophotonic Wires
… is concerned with an emerging set of nonlinear-optical applications using silicon nanophotonic "wires" fabricated on a silicon-on-insulator photonic chip. These deeply scaled silicon nanophotonic wires are capable of confining the telecom and mid-infrared (mid-IR) light tightly into an …
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Synthese von TiO2-Nanopartikeln und Carbazol-Farbstoffderivaten für optische Anwendungen in anorganisch-organischen Hybridpolymeren
Die Arbeit hatte das Ziel, Beiträge zur Synthese photorefraktiver Nanokomposite durch die geschickte Kombination spezieller organischer Farbstoffe mit elektronenleitenden, anorganischen Nanopartikeln oder mit lochleitenden Carbazol-Derivaten in hybriden Polymeren zu leisten. Dabei wurden …