CdTe量子点粘合的银纳米球的静态和超快光学响应
Static and Ultrafast Optical Response of Two Ag Nanospheres Glued by a CdTe Quantum Dot
摘要：
通过适当的波长和偏振态的入射光照射，可以在两个紧密放置的金属纳米颗粒之间产生高局部场的热点。热点处的场的强度预计将比所施加的场的强度增强甚至高达六个数量级。将半导体量子点或分析物分子放置在热点处是利用增强场用于应用的重要步骤。在这篇文章中，我们表明，它是可能的位置之间的两个较大的银纳米球在胶体溶液中的CdTe量子点（QD）。在生长过程中测量的消光光谱表明，最终的混合纳米结构具有两个接触的Ag纳米颗粒（NPs）和在它们之间接近接触点的CdTe QD。使用超快瞬态测量，它已被证明，存在的CdTe量子点强烈影响的动力学时，探针激发的热点。这里展示的将半导体QD放置在两个Ag NP之间的方法是胶体自组装领域的重要步骤，并且用于等离子体传感，光电子学，能量收集，纳米光刻和光学纳米天线中的热点应用。
英文摘要：
A hot-spot of high local field can be created in between two closely placed metal nanoparticles by irradiating them with an appropriate wavelength and polarization of incident light. The strength of the field at the hot-spot is expected to get enhanced by even up to six orders of magnitude than that of the applied field. Placing a semiconductor quantum dot or an analyte molecule at the hot-spot is an essential step towards harnessing the enhanced field for applications. In this article, we show that it is possible to position a CdTe quantum dot (QD) between two larger silver nanospheres in colloidal solution. The extinction spectra measured during growth suggests that the final hybrid nanostructure have two touching Ag nanoparticles (NPs) and a CdTe QD in between them close to the point of contact. Using ultrafast transient measurements, it has been shown that the presence of CdTe QD strongly influence the dynamics when the probe excites the hot-spot. The method demonstrated here to place the semiconductor QD in between the two Ag NPs is an important step in the area of colloidal self-assembly and for application of hot-spot in plasmonic sensing, optoelectronics, energy-harvesting, nanolithography, and optical nano-antennas.
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