旋转等离子体纳米锁
A rotary plasmonic nanoclock
摘要：
纳米光子学的基本挑战之一是获得对纳米级光学元件的完全控制。精确的时空安排决定了它们的相互作用和集体行为。为此，DNA纳米技术被用作一种前所未有的工具，以创建具有优异的空间寻址能力和时间可编程性的纳米光子器件。然而，目前大多数DNA组装的纳米光子器件只能在随机或极少数定义的状态之间重新配置。在这里，我们展示了DNA组装的旋转等离子体纳米锁。在这个系统中，转子金纳米棒可以相对于定子金纳米棒进行定向和可逆的360度旋转，在由DNA燃料提供动力的16种明确定义的配置之间转换。全圈旋转过程由光谱学实时监测。我们进一步证明了由DNA酶-RNA相互作用提供动力的等离子体纳米锁的自主旋转。这种组装方法为完全自下而上的先进纳米光子系统铺平了可行的道路。
英文摘要：
One of the fundamental challenges in nanophotonics is to gain full control over nanoscale optical elements. The precise spatiotemporal arrangement determines their interactions and collective behavior. To this end, DNA nanotechnology is employed as an unprecedented tool to create nanophotonic devices with excellent spatial addressability and temporal programmability. However, most of the current DNA-assembled nanophotonic devices can only reconfigure among random or very few defined states. Here, we demonstrate a DNA-assembled rotary plasmonic nanoclock. In this system, a rotor gold nanorod can carry out directional and reversible 360 degree rotation with respect to a stator gold nanorod, transitioning among 16 well-defined configurations powered by DNA fuels. The full-turn rotation process is monitored by optical spectroscopy in real time. We further demonstrate autonomous rotation of the plasmonic nanoclock powered by DNAzyme-RNA interactions. Such assembly approaches pave a viable route towards advanced nanophotonic systems entirely from the bottom-up.
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