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Near-field analysis of CdSe quantum dot conjugated core-shell nanoparticle

机译:CdSe量子点共轭核壳纳米粒子的近场分析

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We have investigated near field distribution and absorption cross-section of CdSe quantum dot (QD) conjugated gold nanoparticles using three-dimensional finite-difference time-domain method. A gold nanoparticle core was modeled with a different SiO_2 shell thickness and surface density of QDs. Absorption cross-section was found to be proportionate to the shell thickness and the QD surface density. In regard to the absorption by a single QD, either nanoparticle-QD coupling or QD-QD coupling was dominant depending on the surface density. Moreover, shell thickness weakens the coupling and the absorption of a single QD. Finally, enhanced absorption by a QD-conjugated nanoparticle dimer structure is also reported as a result of field enhancement between NPs assisted by QDs.
机译:我们使用三维有限差分时域方法研究了CdSe量子点(QD)共轭金纳米粒子的近场分布和吸收截面。用不同的SiO_2壳厚度和量子点的表面密度对金纳米颗粒核进行建模。发现吸收截面与壳厚度和QD表面密度成比例。关于单个QD的吸收,取决于表面密度,纳米颗粒-QD偶联或QD-QD偶联占主导。此外,壳的厚度削弱了单个QD的耦合和吸收。最后,由于QD辅助的NP之间场增强的结果,还报道了QD共轭纳米颗粒二聚体结构增强的吸收。

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