Search results for "fibre Bragg grating"

showing 2 items of 2 documents

Development and analysis of a model based on chirped fiber Bragg gratings employed for cracks characterization in materials

2018

In this work a model was developed that allows to understand the behavior of a chirped fiber Bragg grating for the detection and characterization of cracks in materials. In addition to the amplitude response, we show that the group delay of the grating provides useful information for the characterization of the crack. The position of the crack can be determined thanks to the linear chirp of the grating that fixes a correlation between the spatial position and both, the wavelength and the group delay. However, our analysis shows that this simple approach has a source of error, which can be overcome if a controllable external strain can be applied to the embedded grating, additional to the st…

Materials scienceCiencias FísicasPhysics::Optics02 engineering and technologyGratingFabry-Perot cavityIDENTIFICATION OF MATERIAL CRACKS01 natural sciencesFABRY–PEROT CAVITY010309 opticsFabry–Perot cavityOpticsFiber Bragg gratingPosition (vector)0103 physical sciencesMODELING OF SENSORSChirpFiberElectrical and Electronic EngineeringPhysical and Theoretical ChemistryGroup delay and phase delayModelling of sensorsÓpticaChirped fibre Bragg gratingsbusiness.industryChirped fiber Bragg gratingsIdentification of material cracksOptical fiber sensorsCHIRPED FIBER BRAGG GRATINGSFísicaOptical fibre sensors021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsUNESCO::FÍSICA::Óptica ::Fibras ópticasElectronic Optical and Magnetic MaterialsWavelengthTransmission (telecommunications):FÍSICA::Óptica ::Fibras ópticas [UNESCO]Modeling of sensorsOPTICAL FIBER SENSORS0210 nano-technologybusinessCIENCIAS NATURALES Y EXACTAS
researchProduct

Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

2013

Photoluminescence and time resolved photoluminescence from single metamorphic InAs/GaAs quantum dots (QDs) emitting at 1.3 mu m have been measured by means of a novel fibre-based characterization set-up. We demonstrate that the use of a wavelength tunable fibre Bragg grating filter increases the light collection efficiency by more than one order of magnitude as compared to a conventional grating monochromator. We identified single charged exciton and neutral biexciton transitions in the framework of a random population model. The QD recombination dynamics under pulsed excitation can be understood under the weak quantum confinement potential limit and the interaction between carriers at the …

single quantum dot time resolved spectroscopy fibre Bragg grating excitonsPhotoluminescenceMaterials scienceexcitonsExcitonfibre Bragg gratingPhysics::OpticsBioengineeringGratinglaw.inventionCondensed Matter::Materials ScienceFiber Bragg gratinglawGeneral Materials ScienceElectrical and Electronic EngineeringBiexcitonMonochromatorWetting layerCondensed Matter::Quantum Gasesbusiness.industryCondensed Matter::OtherMechanical EngineeringGeneral ChemistryCondensed Matter::Mesoscopic Systems and Quantum Hall Effectsingle quantum dottime resolved spectroscopyMechanics of MaterialsQuantum dotOptoelectronicsbusiness
researchProduct