光学学报, 2014, 34 (9): 0924001, 网络出版: 2014-08-12
基于表面等离激元光镊的新型纳米热源研究
Study on Novel Nano-Heating Source Based on Plasmonic Nanotweezers
表面光学 表面等离基元学 表面等离激元光镊 金纳米颗粒 纳米热源 optics at surfaces plasmonics plasmonic nanotweezers gold nanoparticles nano-heating source
摘要
针对纳米尺度热现象研究的需求,基于表面等离激元光镊对金纳米颗粒的动态操控能力,设计了一种实时、动态、可控的纳米热源。利用有限元法对光镊系统中金纳米颗粒的光热效应与表面等离激元电磁场强度的关系进行了模拟,阐明了由于表面等离激元和局域表面等离激元的耦合作用导致的电磁场能量聚集和增强,以及同时实现的金属纳米颗粒的光热效应;分析了在该光镊系统捕获金属颗粒过程中颗粒所产生的热效应,并由此得到了实时控制纳米热源热功率的方法。在理论研究的基础上设计实验并证实了该光镊系统中金纳米颗粒基于光热效应的加热能力。结合表面等离激元光镊系统对纳米热源的精确定位操控能力,该系统为纳米尺度热现象的研究提供了灵活而可靠的手段。
Abstract
To meet demands of researches on nanoscale photothermal effect, a real-time dynamic controllable nano-heating source is demonstrated, which is based on the robust dynamic manipulation of gold nanoparticles by plasmonic nanotweezers. Based on finite element method, the relationship between photothermal effect of gold nanoparticles and the strength of surface plasmon polariton electromagnetic field is elaborated by numerical simulations. The confinement and enhancement of electromagnetic field induced by hybridization of surface plasmon polariton and localized surface plasmon polariton with the nanotweezer system is explained and then the photothermal effect during the progress of nanoparticle capturing are analyzed. Further, the methods to real-time control of its power are delivered. To validate the heating ability of gold nanoparticles in the plasmonic nanotweezers, experiments are implemented. Integrated with plasmonic nanotweezers, the precise manipulation of metal nano-heating source supports a reliable and flexible method for the research of nanoscale thermal effect.
沈军峰, 张翠娇, 张聿全, 王健, 方晖, 闵长俊, 袁小聪. 基于表面等离激元光镊的新型纳米热源研究[J]. 光学学报, 2014, 34(9): 0924001. Shen Junfeng, Zhang Cuijiao, Zhang Yuquan, Wang Jian, Fang Hui, Min Changjun, Yuan Xiaocong. Study on Novel Nano-Heating Source Based on Plasmonic Nanotweezers[J]. Acta Optica Sinica, 2014, 34(9): 0924001.