20 February 2014 Near-field analysis of CdSe quantum dot conjugated core-shell nanoparticle
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Abstract
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 SiO2 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.
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Taehwang Son, Saji Thomas Kochuveedu, Dong Ha Kim, Donghyun Kim, "Near-field analysis of CdSe quantum dot conjugated core-shell nanoparticle", Proc. SPIE 8954, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XI, 89540V (20 February 2014); doi: 10.1117/12.2038885; https://doi.org/10.1117/12.2038885
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