Plasmon-enhanced low-intensity laser switching of gold::vanadium dioxide nanocomposites
Plasmon-enhanced low-intensity laser switching of gold::vanadium dioxide nanocomposites
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DOI：
10.1063/1.3593388
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发表时间：
2011-06-13
影响因子：
4
通讯作者：
Haglund, R. F., Jr.
中科院分区：
文献类型：
--
作者：
Ferrara, D. W.;MacQuarrie, E. R.;Haglund, R. F., Jr.
用机械快门式785 nm泵浦激光器和1550 nm连续波探针测量了60 nm VO（2）薄膜覆盖的金纳米颗粒（NP）阵列的瞬态吸收。尽管Au纳米颗粒仅占纳米复合材料体积的4%，但它们将有效吸收系数提高了1.5倍，并将诱导半导体-金属转变（SMT）所需的阈值激光功率降低了多达37%。有人认为，纳米粒子的功能作为SMT的热引发剂和“纳米辐射体”，以增加光的散射和吸收到带间跃迁的VO（2）。(C)2011年美国物理学会。[doi：10.1063/1.3593388]
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). (C) 2011 American Institute of Physics. [doi:10.1063/1.3593388]