About: Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Detailed study of ultrafast stimulated emission arising from efficient quasidirect transitions in silicon nanocrystals under femtosecond pumping. In nanometer-sized silicon nanocrystals, the quasidirect transitions are rapidly cut off (on subpicosecond time scale) owing to surface trapping of carriers. Consequently, also the core-related radiative recombination undergoes ultrafast decay. We propose, theoretically describe, and experimentally demonstrate an extension of the commonly used variable stripe length (VSL) method, which enables us to measure transient stimulated emission even on the subpicosecond time scale. By applying the extended VSL method we reveal the presence of room-temperature transient optical gain in silicon nanocrystals (lifetime <1 ps) at wavelengths 590 nm with peak values of the order of 100 cm1. Finally, on the basis of our results we discuss possible ways of obtaining a laser source based on silicon nanocrystals. Detailed study of ultrafast stimulated emission arising from efficient quasidirect transitions in silicon nanocrystals under femtosecond pumping. In nanometer-sized silicon nanocrystals, the quasidirect transitions are rapidly cut off (on subpicosecond time scale) owing to surface trapping of carriers. Consequently, also the core-related radiative recombination undergoes ultrafast decay. We propose, theoretically describe, and experimentally demonstrate an extension of the commonly used variable stripe length (VSL) method, which enables us to measure transient stimulated emission even on the subpicosecond time scale. By applying the extended VSL method we reveal the presence of room-temperature transient optical gain in silicon nanocrystals (lifetime <1 ps) at wavelengths 590 nm with peak values of the order of 100 cm1. Finally, on the basis of our results we discuss possible ways of obtaining a laser source based on silicon nanocrystals. (en)
Title	Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals (en)
skos:prefLabel	Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals (en)
skos:notation	RIV/68378271:_____/11:00373625!RIV12-AV0-68378271
http://linked.open...avai/predkladatel	Fyzikální ústav AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	P S Z
http://linked.open...avai/riv/aktivity	P(IAA101120804), P(KAN400100701), P(LC510), S, Z(AV0Z10100521), Z(MSM0021620834)
http://linked.open...iv/cisloPeriodika	8
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Pelant, Ivan Žídek, Karel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	236662
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/11:00373625
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	silicon nanocrystals; optical gain; fast radiative recombination (en)
http://linked.open.../riv/klicoveSlovo	optical gain fast radiative recombination silicon nanocrystals
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[68D140A2207C]
http://linked.open...i/riv/nazevZdroje	Physical Review. B
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	10 (xsd:int)
http://linked.open...vavai/riv/projekt	Center of nanotechnology and materials for nanoelectronics Silicon nanostructures for photonics Functional hybrid nanosystems of semiconductors and metals with organic materials (FUNS)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	84
http://linked.open...iv/tvurceVysledku	Malý, P. Pelant, Ivan Trojánek, F. Gilliot, P. Horrocks, B. R. Hönerlage, B. Little, R. Oberlé, J. Šiller, L. Žídek, Karel
http://linked.open...ain/vavai/riv/wos	000294326200011
http://linked.open...n/vavai/riv/zamer	Physics and technology of nanostructures, surfaces and thin films Condensed Matter Physics – New Materials and Technologies
issn	1098-0121
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevB.84.085321
is http://linked.open...avai/riv/vysledek of	Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals Ultrafast stimulated emission due to quasidirect transitions in silicon nanocrystals

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