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http://hdl.handle.net/10773/6114
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Macatrão, M. | pt |
dc.contributor.author | Peres, M. | pt |
dc.contributor.author | Rubinger, C. P. L. | pt |
dc.contributor.author | Soares, M. J. | pt |
dc.contributor.author | Costa, L. C. | pt |
dc.contributor.author | Costa, F. M. | pt |
dc.contributor.author | Monteiro, T. | pt |
dc.contributor.author | Franco, N. | pt |
dc.contributor.author | Alves, E. | pt |
dc.contributor.author | Saggioro, B. Z. | pt |
dc.contributor.author | Andreeta, M. R. B. | pt |
dc.contributor.author | Hernandes, A. C. | pt |
dc.date.accessioned | 2012-02-09T15:25:10Z | - |
dc.date.issued | 2009-02 | - |
dc.identifier.issn | 0026-2692 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/6114 | - |
dc.description.abstract | Structural, spectroscopic and dielectric properties of thulium-doped laser-heated pedestal Ta2O5 as-grown fibres were studied. Undoped samples grow preferentially with a single crystalline monoclinic structure. The fibre with the lowest thulium content (0.1 at%) also shows predominantly a monoclinic phase and no intra-4f12 Tm3+ recombination was observed. For sample with the highest thulium amount (1.0 at%), the appearance of a dominant triclinic phase as well as intraionic optical activation was observed. The dependence of photoluminescence on excitation energy allows identification of different site locations of Tm3+ ions in the lattice. The absence of recombination between the first and the ground-state multiplets as well as the temperature dependence of the observed transitions was justified by an efficient energy transfer between the Tm3+ ions. Microwave dielectric properties were investigated using the small perturbation theory. At a frequency of 5 GHz, the undoped material exhibits a dielectric permittivity of 21 and for thulium-doped Ta2O5 samples it decreases to 18 for the highest doping concentration. Nevertheless, the dielectric losses maintain a very low value. | pt |
dc.description.sponsorship | FCT - PTDC/CTM/66195/2006 | pt |
dc.description.sponsorship | FCT - PTDC/FIS/66262/2006 | pt |
dc.description.sponsorship | FCT - PTDC/FIS/72843/2006 | pt |
dc.language.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.relation.uri | http://www.scopus.com/inward/record.url?eid=2-s2.0-58749110683&partnerID=40&md5=07792e3d74b0c556771191f8a1b593b4 | - |
dc.rights | openAccess | por |
dc.subject | Tantalum pentoxide | pt |
dc.subject | LHPG-growth | pt |
dc.subject | Rare earth doping | pt |
dc.subject | XRD | pt |
dc.subject | PL | pt |
dc.title | Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 309 | pt |
degois.publication.issue | 2 | pt |
degois.publication.issue | 2 | - |
degois.publication.lastPage | 312 | pt |
degois.publication.title | Microelectronics Journal | pt |
degois.publication.volume | 40 | pt |
dc.identifier.doi | 10.1016/j.mejo.2008.07.033 | * |
Appears in Collections: | DFis - Artigos I3N-FSCOSD - Artigos |
Files in This Item:
File | Description | Size | Format | |
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MJ.pdf | versão pdf do editor | 687.51 kB | Adobe PDF | View/Open |
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