等离子体子
材料科学
表面等离子共振
胶体金
纳米颗粒
局域表面等离子体子
表面等离子体子
等离子纳米粒子
分子物理学
吸收(声学)
光散射
散射
光电子学
拉曼散射
波长
表面等离子体激元
红外线的
作者
Yovan de Coene,Olivier Deschaume,Yuqing Zhang,Arne Billen,Jing He,Stephanie Seré,Stefan Knoppe,Stijn Van Cleuvenbergen,Thierry Verbiest,Koen Clays,Jian Ye,Carmen Bartic
出处
期刊:ChemPhysChem
[Wiley]
日期:2019-07-02
卷期号:20 (13): 1765-1774
被引量:2
标识
DOI:10.1002/cphc.201900194
摘要
Gold nanoparticles (AuNPs) are regarded as promising building blocks in functional nanomaterials for sensing, drug delivery and catalysis. One remarkable property of these particles is the localized surface plasmon resonance (LSPR), which gives rise to augmented optical properties through local field enhancement. LSPR also influences the nonlinear optical properties of metal NPs (MNPs) making them potentially interesting candidates for fast, high resolution nonlinear optical imaging. In this work we characterize and discuss the wavelength dependence of the hyper-Rayleigh scattering (HRS) behavior of spherical gold nanoparticles (GNP) and gold nanorods (GNR) in solution, from 850 nm up to 1300 nm, covering the near-infrared (NIR) window relevant for deep tissue imaging. The high-resolution spectral data allows discriminating between HRS and two photon photoluminescence contributions. Upon particle aggregation, we measured very large enhancements (ca. 104 ) of the HRS intensity in the NIR, which is explained by considering aggregation-induced plasmon coupling effects and local field enhancement. These results indicate that purposely designed coupled nanostructures could prove advantageous for nonlinear optical imaging and biosensing applications.
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