Article: Active emitters based on nanostructured Si Journal: International Journal of Nanotechnology (IJNT) 2008 Vol.5 No.6/7/8 pp.574 - 591 Abstract: The present paper deals with the use of Si nanoclusters as efficient sensitisers for Er and Nd rare earth ions or as active emitters in Si/SiO2 Fabry-Perot microcavities. The films have been fabricated using the reactive magnetron sputtering of a silica target. The energy transfer efficiency from Si-nc towards Er ions has been studied as a function of the fabrication parameters (hydrogen rate, annealing temperature) through time resolved PL intensity measurements on Er-doped silicon-rich silica layers. A multilayer approach has been developed to determine the critical parameters such as the optimum Si-nc size and the characteristic interaction distance Si-nc-Er ions which govern the transfer Si-nc-Er. Thus we have found an optimum size of 4 nm for the Si nanocluster and a maximum spacing of 0.4 nm between the Si-nc sensitisers and the Er3+ ions. First results on the efficient sensitising effect of Si nanocluster towards Nd3+ ions are also reported. Concerning the optical planar Si/SiO2 microcavities, spectral, spatial and temporal photoluminescence behaviour of the Si/SiO2 multilayers confined inside the resonator are studied. The comparison with a reference sample evidences the effect of the distributed Bragg reflectors structure on the intensity enhancement and the directional characteristic of the emission. Inderscience Publishers - linking academia, business and industry through research

Title: Active emitters based on nanostructured Si

Authors: F. Gourbilleau, A. Belarouci, D. Breard, C. Dufour, R. Rizk

Addresses: CIMAP, UMR CNRS, CEA, ENSICAEN, Universite de Caen, 6 Bd Marechal Juin, 14050 Caen Cedex, France. ' CIMAP, UMR CNRS, CEA, ENSICAEN, Universite de Caen, 6 Bd Marechal Juin, 14050 Caen Cedex, France. ' CIMAP, UMR CNRS, CEA, ENSICAEN, Universite de Caen, 6 Bd Marechal Juin, 14050 Caen Cedex, France. ' CIMAP, UMR CNRS, CEA, ENSICAEN, Universite de Caen, 6 Bd Marechal Juin, 14050 Caen Cedex, France. ' CIMAP, UMR CNRS, CEA, ENSICAEN, Universite de Caen, 6 Bd Marechal Juin, 14050 Caen Cedex, France

Abstract: The present paper deals with the use of Si nanoclusters as efficient sensitisers for Er and Nd rare earth ions or as active emitters in Si/SiO₂ Fabry-Perot microcavities. The films have been fabricated using the reactive magnetron sputtering of a silica target. The energy transfer efficiency from Si-nc towards Er ions has been studied as a function of the fabrication parameters (hydrogen rate, annealing temperature) through time resolved PL intensity measurements on Er-doped silicon-rich silica layers. A multilayer approach has been developed to determine the critical parameters such as the optimum Si-nc size and the characteristic interaction distance Si-nc-Er ions which govern the transfer Si-nc-Er. Thus we have found an optimum size of 4 nm for the Si nanocluster and a maximum spacing of 0.4 nm between the Si-nc sensitisers and the Er³⁺ ions. First results on the efficient sensitising effect of Si nanocluster towards Nd³⁺ ions are also reported. Concerning the optical planar Si/SiO₂ microcavities, spectral, spatial and temporal photoluminescence behaviour of the Si/SiO₂ multilayers confined inside the resonator are studied. The comparison with a reference sample evidences the effect of the distributed Bragg reflectors structure on the intensity enhancement and the directional characteristic of the emission.

Keywords: reactive magnetron sputtering; rare earth; silicon nanocrystals; Fabry-Perot microcavities; active emitters; silicon nanoclusters; nanotechnology.

DOI: 10.1504/IJNT.2008.018683

International Journal of Nanotechnology, 2008 Vol.5 No.6/7/8, pp.574 - 591

Published online: 14 Jun 2008 *

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Title: Active emitters based on nanostructured Si

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