Opt Lett. 2018 Jul 15;43(14):3413-3416. doi: 10.1364/OL.43.003413.
We demonstrate that a highly localized plasmonic dark mode with radial symmetry, termed quadrupole-bonded radial breathing mode, can be used for optically trapping the dielectric nanoparticles. In particular, the annular potential well produced by this dark mode shows a sufficiently large depth to stably trap the 5 nm particles under a relatively low optical power. Our results address the quest for precisely trapping sub-10 nm particles with high yield and pave the way for placing sub-10 nm particles conforming to a specific geometric pattern.
我们证明了一种具有径向对称性的高度局域等离子体暗模式，称为四极键合的径向呼吸模式，可用于光学捕获介电纳米颗粒。具体来说，这种暗模式产生的环形势阱具有足够大的深度，可以在相对较低的光功率下稳定捕获 5nm 的颗粒。我们的结果解决了以高产量精确捕获亚 10nm 颗粒的难题，并为放置符合特定几何图案的亚 10nm 颗粒铺平了道路。
