Search results for "Bulk crystal"

showing 2 items of 2 documents

Characterization of PP-cLT Waveguides for Second-Harmonic-Generation and Wavelength-Conversion in the C + L Band of Optical Communications

2010

We report the characterization of single-mode optical waveguides at telecom wavelength, realized in congruent lithium-tantalate. We demonstrate that waveguides realized by proton-exchange show a nonlinear coefficient matching that expected in a bulk crystal.

L bandMaterials sciencebusiness.industryIntegrated optics Wavelength conversion devicesOptical communicationPhysics::OpticsSecond-harmonic generationWavelength conversionCharacterization (materials science)WavelengthOpticsOptoelectronicsbusinessPhase conjugationBulk crystal
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Ab initio Calculations of Bulk and (001) Surface F-centers in ABO3 Perovskites

2021

We analyzed systematic trends in BaTiO 3, SrTiO 3 , PbZrO 3 and SrZrO 3 bulk as well as very rarely performed (001) surface F-center ab initio calculations. The nearest neighbor atomic displacements around the bulk F-center in the ABO 3 perovskites are considerably smaller than the relevant neighbor atomic displacements around the (001) surface $F$ -centers. The $F$ -center electrons are more delocalized for the ABO 3 perovskite (001) surface $F$ -center than for the bulk $F$ -center. Our calculated formation energy differences between the BaTiO 3 , SrTiO 3 , PbZrO 3 and SrZrO 3 bulk and its (001) surface $F$ -centers triggers the $F$ -center segregation from the bulk crystal towards the AB…

Surface (mathematics)Delocalized electronMaterials scienceCondensed matter physicsAb initio quantum chemistry methodsElectronk-nearest neighbors algorithmPerovskite (structure)Bulk crystal2021 IEEE 12th International Conference on Electronics and Information Technologies (ELIT)
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