Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Nanotechnology. 2012 Jun 1;23(21):215302. doi: 10.1088/0957-4484/23/21/215302. Epub 2012 May 3.
Gold nanorods are too tiny to be manipulated using conventional mechanical methods. In this paper, we demonstrate the trapping, transferring, positioning and patterning of gold nanorods with dual-optical tweezers. The convenient manipulations are achieved by taking advantage of the longitudinal surface plasmon resonance of gold nanorods and the anisotropic optical trapping forces formed by two linearly polarized Gaussian beams. The trapped gold nanoparticles are positioned extremely firmly and quickly on a substrate compared with randomly dispersed ones. It is observed that gold nanorods show advantages over gold nanospheres with regard to positioning speed and stability. More importantly, versatile plasmon coupling effects have been achieved in some patterned nanorods.
金纳米棒太小，无法使用传统的机械方法进行操作。在本文中，我们利用双光镊展示了对金纳米棒的捕获、转移、定位和图案化。通过利用金纳米棒的纵向表面等离子体共振和两个线偏振高斯光束形成的各向异性光阱力，实现了方便的操作。与随机分散的金纳米颗粒相比，捕获的金纳米颗粒在基底上的定位极其牢固且快速。观察到金纳米棒在定位速度和稳定性方面优于金纳米球。更重要的是，在一些图案化的纳米棒中实现了多功能等离子体耦合效应。
