Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, 1 University Station, C1600 Austin, Texas 78712-0264, USA.
Nano Lett. 2012 Nov 14;12(11):5756-60. doi: 10.1021/nl303035p. Epub 2012 Oct 8.
We demonstrate nanometer precision manipulation of multiple nanoparticles at room temperature. This is achieved using the optical binding force, which has been assumed to be weak compared to the optical gradient and scattering forces. We show that trapping by the optical binding force can be over 20 times stronger than by the gradient force and leads to ultrastable, rigid configurations of multiple nanoparticles free in solution - a realization of "optical matter." In addition, we demonstrate a novel trapping scheme where even smaller nanoparticles are trapped between larger "anchor" particles. Optical binding opens the door for the observation of collective phenomena of nanoparticles and the design of new materials and devices made from optical matter.
我们演示了在室温下对多个纳米粒子进行纳米级精度的操作。这是通过使用光结合力来实现的，与光梯度力和散射力相比，光结合力被认为较弱。我们表明，光结合力的捕获力可以比梯度力强 20 多倍，并导致多个纳米粒子在溶液中自由形成超稳定、刚性的配置——这是“光物质”的实现。此外，我们还展示了一种新的捕获方案，即使更小的纳米粒子也可以被捕获在较大的“锚定”粒子之间。光结合为观察纳米粒子的集体现象以及设计由光物质组成的新材料和设备打开了大门。
