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Publicação
Flexible random lasers in dye-doped bio-degradable cellulose nanocrystalline needles
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Orientador(es)
Resumo(s)
In this work, we developed and investigated a random laser based on rhodamine6G (Rh6G) in ethylene glycol (EG) solution with varying cellulose nanocrystalline (CNC) needles as scatterers in the lasing media. Besides the suspension-in-cuvette scheme, an alternative configuration was also employed: a dye-CNC flexible self-supported thick-film (70 µm) random laser made by drop casting of the CNCs + Rh6G + hydroxypropyl cellulose suspension. In relation to conventional scatterers, the biodegradable cellulose nanocompounds showed a comparable reduction in both the spectral full width at half-maximum and the energy threshold values, with an optimal concentration of 5 mg [CNC]/ml[EG] in suspension. Its performance was also compared with other cellulose-based random lasers, presenting advantages for some parameters. The flexible film configuration showed similar results, but contained 10% less Rh6G than the suspension.
Descrição
M-ERA-NET2/0007/2016
POCI-01-0145-FEDER-007688
PTDC/CTM-BIO/6178/2014
PTDC/CTM-REF/30529/2017
UID/CTM/50025
Palavras-chave
Statistical and Nonlinear Physics Atomic and Molecular Physics, and Optics