Search results for "Optical waveguides"

showing 4 items of 14 documents

Kinetic evidence for the solubilization of pyridine-2-azo-p-dimethylaniline in alkanediyl-α,ω-bis(dimethylcetylammonium nitrate) surfactants. Role of…

2004

The incorporation of the bidentate ligand pyridine-2-azo-p-dimethylaniline (PADA) into micellar aggregates of the dimeric cationic surfactants propanediyl-, hexanediyl- and dodecanediyl-alpha,omega-bis(dimethylcetylammonium nitrate) (16-3-16,2NO(3)(-), 16-6-16,2NO(3)(-) and 16-12-16,2NO(3)(-), respectively) has been studied at 25 degreesC by examining the kinetics of the complexation reaction of the Ni(II) ion with this ligand. For comparison, cetyltrimethylammonium nitrate ( CTAN), which can be considered as the "monomeric'' surfactant of 16-3-16,2NO(3)(-), has also been used. The kinetic data have shown that, for 16-3-16,2NO(3)(-) and CTAN, at a surfactant concentration below the critical…

Reaction mechanismInorganic chemistryMicelleCATIONIC GEMINI SURFACTANTSCatalysisHydrophobic effectReaction rate constantPulmonary surfactantDIMERIC SURFACTANTSPolymer chemistryMaterials ChemistryWATERELECTRON TRANSFERANGLE NEUTRON SCATTERINGInterfaces (materials) Optical waveguides metal ionsAqueous solutionAGGREGATION PROPERTIESChemistryAQUEOUS SOLUTIONCationic polymerizationGeneral ChemistryANIONIC MICELLESSUBSTITUTED FERROCENESCritical micelle concentrationBROMIDE SURFACTANTSANGLE NEUTRON SCATTERING; CATIONIC GEMINI SURFACTANTS; AQUEOUS SOLUTION; BROMIDE SURFACTANTS; DIMERIC SURFACTANTS; SUBSTITUTED FERROCENES; AGGREGATION PROPERTIES; ELECTRON TRANSFER; ANIONIC MICELLES; WATERNew J. Chem.
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Exploiting the optical quadratic nonlinearity of zinc-blende semiconductors for guided-wave terahertz generation: A material comparison

2010

We present a detailed analysis and comparison of dielectric waveguides made of CdTe, GaP, GaAs and InP for modal phase matched optical difference frequency generation (DFG) in the terahertz domain. From the form of the DFG equations, we derived the definition of a very general figure of merit (FOM). In turn, this FOM enabled us to compare different configurations, by taking into account linear and nonlinear susceptibility dispersion, terahertz absorption, and a rigorous evaluation of the waveguide modes properties. The most efficient waveguides found with this procedure are predicted to approach the quantum efficiency limit with input optical power in the order of kWs.

Semiconductor waveguidesTerahertz radiationPhase (waves)FOS: Physical sciencesPhysics::OpticsOptical powerFrequency conversionSettore ING-INF/01 - ElettronicaOptical pulse generationSemiconductor materialsDispersion (optics)Optical phase matchingFigure of meritOptical parametric amplifiersElectrical and Electronic EngineeringOptical propagation in nonlinear mediaPhysicsGuided wave testingbusiness.industryOptical frequency conversionCondensed Matter PhysicsAtomic and Molecular Physics and OpticsOptical waveguidesNonlinear systemOptical materialsTerahertz generationOptoelectronicsOptical frequency conversion Optical materials Optical parametric amplifiers Optical phase matching Optical propagation in nonlinear media Optical pulse generation Optical waveguides Frequency conversion Semiconductor materials Semiconductor waveguidesQuantum efficiencybusinessOptics (physics.optics)Physics - OpticsIEEE Journal of Quantum Electronics
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Fabrication and Characterization of Polymeric Optical Waveguides Using Standard Silicon Processing Technology

2005

We report the fabrication and characterization of a rib polymeric waveguide having a thick layer of oxidized porous silicon as an innovative solution for the lower cladding. The waveguide was fabricated using standard silicon substrates and Si-based technology. The multimodal guiding structure has a polymethylmetacrylate (PMMA) core and the innovative lower cladding was obtained by thermal oxidation of a porous silicon layer. The waveguide does not have the upper cladding. Propagation loss measurements were performed at 1.48 /spl mu/m using the cut-back method. We obtained propagation loss of about 1.7 dB/cm, confirming the possibility to use the porous silicon oxide as the lower cladding l…

Thermal oxidationMaterials scienceFabricationSiliconbusiness.industryHybrid silicon laserchemistry.chemical_elementPorous siliconCladding (fiber optics)Waveguide (optics)Optical waveguidesOpticschemistryOptoelectronicsbusinessRefractive indexWaveguidesEthers
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Analytical results for 2-D non-rectilinear waveguides based on a Green's function

2008

We consider the problem of wave propagation for a 2-D rectilinear optical waveguide which presents some perturbation. We construct a mathematical framework to study such a problem and prove the existence of a solution for the case of small imperfections. Our results are based on the knowledge of a Green's function for the rectilinear case.

wave propagation • optical waveguides • Green's function • perturbation methods
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