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RESEARCH PRODUCT
Transient absorption with a femtosecond tunable excitation pump reveals the emission kinetics of color centers in amorphous silica.
Sylvain GirardEmmanuel MarinMarco CannasAlice SciortinoYoucef OuerdaneVincenzo De MicheleAziz BoukenterFabrizio Messinasubject
Materials scienceAbsorption spectroscopytransient absorption02 engineering and technology01 natural sciencesMolecular physics010309 opticssymbols.namesakeOpticsStokes shift0103 physical sciencesUltrafast laser spectroscopyluminescenceAbsorption (electromagnetic radiation)ultra-fast laser spectroscopyComputingMilieux_MISCELLANEOUS[PHYS.PHYS]Physics [physics]/Physics [physics]business.industrypoint defect021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsAmorphous solidPhotoexcitationsilicaFemtosecondsymbols0210 nano-technologybusinessExcitationdescription
We report a set of femtosecond (fs) transient absorption (TA) measurements following the dynamics of the so-called nonbridging oxygen hole center in silica, a model color center in wide bandgap amorphous solids, characterized by a very large Stokes shift between the UV excitation and its associated red emission at 1.9 eV. The changes in the TA spectrum were probed in the UV-visible range at various delays after photoexcitation and analyzed as a function of the UV excitation energy, in single-photon absorption conditions. The combination of the experiments helps to clarify the defect photocycle, highlighting how TA measurements with tunable UV excitation could represent a powerful tool to investigate the dynamics of color centers embedded in transparent materials. © 2021 Optical Society of America
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-01 | Optics letters |