Photonics and Optoelectronics Group, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München , Amalienstr. 54, 80799 Munich, Germany.
Nano Lett. 2013 Sep 11;13(9):4164-8. doi: 10.1021/nl401788w. Epub 2013 Aug 8.
We report on the deposition of individual gold nanorods from an optical trap using two different laser wavelengths. Laser light, not being resonant to the plasmon resonances of the nanorods, is used for stable trapping and in situ alignment of individual nanorods. Laser light, being resonant to the transversal mode of the nanorods, is used for depositing nanorods at desired locations. The power and polarization dependence of the process is investigated and discussed in terms of force balances between gradient and scattering forces, plasmonic heating, and rotational diffusion of the nanorods. This two-color approach enables faster printing than its one-color equivalent and provides control over the angular orientation (±16°) and location of the deposited nanorods at the single-nanorod level.
我们报告了使用两种不同激光波长从光阱中沉积单个金纳米棒的情况。激光光，由于与纳米棒的等离子体共振不匹配，因此用于稳定捕获和原位对准单个纳米棒。激光光，由于与纳米棒的横向模式匹配，因此用于将纳米棒沉积在所需的位置。该过程的功率和偏振依赖性根据梯度力和散射力之间的力平衡、等离子体加热以及纳米棒的旋转扩散进行了研究和讨论。这种双色方法比其单色等效方法更快地进行打印，并提供了对沉积的纳米棒的角取向（±16°）和位置（单纳米棒级别的）的控制。
