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首页> 外文期刊>Angewandte Chemie >Electric-Field Enhancement Inducing Near-Infrared Two-Photon Absorption in an Indium-Tin Oxide Nanoparticle Film
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Electric-Field Enhancement Inducing Near-Infrared Two-Photon Absorption in an Indium-Tin Oxide Nanoparticle Film

机译：电场增强诱导氧化铟锡纳米粒子薄膜中的近红外双光子吸收。

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摘要

Nanoparticles (NPs) of noble metals such as gold and silver are well-known to have strong plasmon bands in the visible region and show unique optical characteristics because of an enhanced near-field electric field at the NP surface. This near field can sense the environmental properties through optical measurements of light absorption and scattering. The plasmon resonance condition changes when the refractive index of the surrounding medium changes, which can be measured as an absorption band shift. Even a single molecule can be detected through surface-enhanced Raman scattering (SERS) when the molecule is located within the enhanced electric field. SERS enhancement factors of > 10~4 for a spherical NP and > 10~(10) for a NP dimer are reported. The SERS enhancement factor is proportional to E~4, where E is the electromagnetic field enhancement factor.
机译：众所周知，贵金属（例如金和银）的纳米颗粒（NPs）在可见光区域具有很强的等离激元能带，并由于NP表面处增强的近场电场而显示出独特的光学特性。该近场可以通过光吸收和散射的光学测量来感测环境特性。当周围介质的折射率发生变化时，等离振子共振条件也会发生变化，这可以通过吸收带位移来测量。当分子位于增强电场中时，甚至可以通过表面增强拉曼散射（SERS）检测到单个分子。据报道，球形NP的SERS增强因子> 10〜4，NP二聚体的SERS增强因子> 10〜（10）。 SERS增强因子与E〜4成正比，其中E是电磁场增强因子。

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