Random lasing at localization induced in correlated colloidal system
| Autor: | Christian T. Dominguez, Anderson A.V. Gomes, Jessica Dipold, Valdeci Mestre, Weliton S. Martins, Niklaus Ursus Wetter, Ernesto Jiménez-Villar |
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| Rok vydání: | 2021 |
| Předmět: |
Random laser
Materials science Organic Chemistry Shell (structure) Physics::Optics Nanoparticle Laser Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Condensed Matter::Soft Condensed Matter Inorganic Chemistry Rhodamine 6G Condensed Matter::Materials Science chemistry.chemical_compound Colloid chemistry law Coulomb Electrical and Electronic Engineering Physical and Theoretical Chemistry Lasing threshold Spectroscopy |
| Zdroj: | Optical Materials. 120:111428 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2021.111428 |
| Popis: | Random lasers have the potential for cheap and coherent light sources which, in the particular case of colloidal suspensions, are completely flexible and can take on any desired shape. Here, we studied random lasing in correlated colloidal systems composed by TiO2@Silica nanoparticles suspended in ethanol solutions of Rhodamine 6G. TiO2 particles with two different silica layers (thicknesses of 40 nm and 70 nm) were prepared. The Random laser performance improves when the silica shell is thicker (70 nm), which was attributed to a stronger localization of light (higher density of localized states) induced by stronger correlation in the scatterers' (TiO2@Silica) position as a consequence of a stronger and longer-range Coulomb interaction between the scatterers. Light diffraction patterns in both TiO2@Silica suspensions showed a stronger correlation in the scatterers’ position, being stronger when the silica shell is thicker. |
| Databáze: | OpenAIRE |
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