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 |
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Hauptverfasser: | , , , , |
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
. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.3593388 |