Photonic and Thermofluidic Analysis of Colloidal Plasmonic Nanorings and Nanotori for Pulsed-Laser Photothermal Applications

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• 作者：Fatema Alali ; Ioannis H. Karampelas ; Young Hwa Kim ; Edward P. Furlani
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 3, 2013
• 年：2013
• 卷：117
• 期：39
• 页码：20178-20185
• 全文大小：452K
• 年卷期：v.117,no.39(October 3, 2013)
• ISSN：1932-7455

文摘

We propose the use of plasmonic nanorings and nanotori for enhanced colloidal photothermal energy conversion in the visible (vis) to near-infrared (NIR) spectrum. We use full-wave field analysis to demonstrate for the first time that the plasmon resonant absorption of these structures remains high over a broad range of orientations relative to the polarization of the incident field. The finding of strong orientation-independent plasmon absorption is a key result as it indicates that the structures can provide enhanced photothermal heating for colloidal applications. We use computational fluid dynamic analysis to investigate pulsed-laser plasmon-enhanced heating of the nanostructures in a fluid. We quantify the laser intensity and pulse duration needed to superheat the nanostructures to initiate bubble nucleation, and we simulate the dynamics of generated nanobubbles. The modeling provides insight into the plasmonic and thermofluidic behavior of colloidal nanostructures, thereby enabling rational design of novel plasmon-enhanced photothermal processes.