Influence of high-refractive-index oxide coating on optical properties of metal nanoparticles
Influence of high-refractive-index oxide coating on optical properties of metal nanoparticles
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DOI：
10.1364/josab.30.000338
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发表时间：
2013-02-01
影响因子：
1.9
通讯作者：
Nieminen, Risto M.
中科院分区：
文献类型：
--
作者：
Laaksonen, Katri;Suomela, Samu;Nieminen, Risto M.
金属纳米粒子的局域表面等离子体共振吸收目前被用于许多领域，如近红外（NIR）固化和生物医学应用。在本文中，我们从理论上研究的影响的氧化物（SiO2，ZrO 2，或TiO 2）外壳上的金属（Ag，Au，或Cu）纳米粒子的角度来看，移动的共振峰更理想的颜色或近红外波长，同时保存的吸收或消光峰的强度。在研究中使用的计算模型包括米氏理论和四通量方法。我们发现位移高达数百甚至接近1000 nm。在所研究的材料组合中，当从没有氧化物壳的几纳米尺寸的核到具有100 nm厚壳的100 nm尺寸的核时，用Ag-TiO 2核-壳纳米颗粒获得最大的位移。然而，巨大的位移与吸收峰的严重强度损失一起发生，导致对数百纳米的实际有用位移的更保守估计。(c)2013年美国光学学会
The localized surface-plasmon resonance absorption of metal nanoparticles is currently utilized in many fields such as near-infrared (NIR) curing and biomedical applications. In this paper, we study theoretically the influence of an oxide (SiO2, ZrO2, or TiO2) shell on a metal (Ag, Au, or Cu) nanoparticle from the point of view of shifting the resonance peak to a more desirable color or NIR wavelengths while conserving the intensity of the absorption or extinction peak. The computational models used in the studies include the Mie theory and the four-flux method. We find shifts of up to hundreds or even close to 1000 nm. Among the material combinations studied, the largest shifts are obtained with Ag-TiO2 core-shell nanoparticles when going from a few nanometers sized core without an oxide shell to a 100 nm size core with a 100 nm thick shell. However, the huge shifts happen together with severe intensity loss of the absorption peak, leading to a more conservative estimate of practically useful shifts of a few hundreds of nanometers. (c) 2013 Optical Society of America