Plasmon-enhanced low-intensity laser switching of gold::vanadium dioxide nanocomposites

Transient absorption of gold nanoparticle (NP) arrays covered by a 60 nm thick film of VO 2 was measured using a mechanically shuttered 785 nm pump laser and a 1550 nm cw probe. Even though the Au NPs constitute only 4% by volume of the nanocomposite, they increase the effective absorption coefficie...

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Veröffentlicht in:Applied physics letters 2011-06, Vol.98 (24), p.241112-241112-3
Hauptverfasser: Ferrara, D. W., MacQuarrie, E. R., Nag, J., Kaye, A. B., Haglund, R. F.
Format: Artikel
Sprache:eng
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Zusammenfassung:Transient absorption of gold nanoparticle (NP) arrays covered by a 60 nm thick film of VO 2 was measured using a mechanically shuttered 785 nm pump laser and a 1550 nm cw probe. Even though the Au NPs constitute only 4% by volume of the nanocomposite, they increase the effective absorption coefficient by a factor of 1.5 and reduce the threshold laser power required to induce the semiconductor-to-metal transition (SMT) by as much as 37%. It is argued that the NPs function as thermal initiators for the SMT and as "nanoradiators" to increase the scattering and absorption of light into interband transitions of the VO 2 .
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3593388