Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Davinson M. da Silva"'
Autor:
Josivanir G. Câmara, Davinson M. da Silva, Luciana R. P. Kassab, Manoel L. Silva-Neto, Guillermo Palacios, Cid B. de Araújo
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022)
Abstract We investigated the random lasing process and Replica Symmetry Breaking (RSB) phenomenon in neodymium ions (Nd3+) doped lead-germanate glass–ceramics (GCs) containing MgO. Glass samples were fabricated by conventional melt-quenching techni
Externí odkaz:
https://doaj.org/article/1c791fdbbdfe4849a5d02844f38e51c4
Autor:
Luiz M. M. Barreto, Davinson M. da Silva, Antonio D. Santos, Koiti Araki, Cid B. de Araújo, Luciana R. P. Kassab
Publikováno v:
Applied Optics. 62:C122
Multilayer graphene (MLG) thin films were produced by a sputtering technique on a cobalt buffer-layer prepared at 500°C and thermal annealed after the deposition. The transformation of amorphous carbon (C) to graphene occurs by diffusion of C atoms
Publikováno v:
Latin America Optics and Photonics (LAOP) Conference 2022.
Random Lasing is reported for the first time in Nd3+-doped lead-germanate glass powders. Above laser threshold (0.3 mJ/mm2) a short pulse, in the nanosecond range is observed corroborating the lasing process.
Autor:
Luiz M. M. Barreto, Davinson M. da Silva, Antonio D. Santos, Koiti Araki, Marcelo Nakamura, Luciana R. P. Kassab
Publikováno v:
Latin America Optics and Photonics (LAOP) Conference 2022.
Carbon thin films were produced by sputtering technique on Co buffer-layer prepared at 500°C, and thermal annealed after the deposition. Raman results are presented, and normalized transmittance measurements showed potential for applications on opti
Publikováno v:
2021 35th Symposium on Microelectronics Technology and Devices (SBMicro).
GeO 2 -PbO glasses demonstrated to be adequate hosts for incorporation of rare-earth ions and nucleation of metallic nanoparticles. However, Ag nanoclusters were not explored in GeO 2 -PbO glasses. The luminescence of Ag nanoclusters in glasses has s
Publikováno v:
Optical Materials. 131:112648
Publikováno v:
Journal of Alloys and Compounds. 772:58-63
We synthesized the Bi 2 O 3 –GeO 2 (BGO) glass doped with thulium ions (Tm 3+ ) and investigate the influence of embedded silver nanoparticles (Ag-NPs) on the samples photoluminescence (PL) and on the process of energy transfer (ET) among bismuth i
Publikováno v:
Journal of Non-Crystalline Solids. 498:395-400
We report the enhanced infrared-to-visible frequency upconversion (UC) in Yb3+/Er3+ codoped Bi2O3-GeO2 (BGO) glasses prepared using the melt quenching technique, with low concentration of AgNO3. Silver nanoparticles (NPs) with average size around 4 n
Publikováno v:
OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF).
Photoluminescence to amplified spontaneous emission transition is observed for the first time in a Nd3+ doped zinc tellurite (TZO) glass powder. The results indicate TZO glasses are promising scattering gain medium for random lasing.
Autor:
Davinson M. da Silva, Anderson S. L. Gomes, Josivanir Gomes Câmara, Cid B. de Araújo, Luciana R. P. Kassab
Publikováno v:
Journal of Luminescence. 233:117936
Random Laser (RL) operation is reported for the first time in neodymium ions (Nd3+) doped zinc-tellurite (TZO) glass-powders. TZO glass was prepared by conventional melt-quenching technique and polydisperse micrometric grains with varying Nd3+ concen