期刊
NANO LETTERS
卷 11, 期 2, 页码 321-328出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl103070n
关键词
Optical force; optical trapping; surface plasmon polariton; hybrid plasmonic waveguide
类别
资金
- U.S. Department of Energy [DE-AC02-05CH11231]
- Engineering and Physical Sciences Research Council [EP/I004343/1] Funding Source: researchfish
- EPSRC [EP/I004343/1] Funding Source: UKRI
We demonstrate that in a hybrid plasmonic system the optical force exerted on a dielectric waveguide by a Metallic substrate is enhanced by more than 1 order of magnitude compared to the force between a photonic waveguide and a dielectric substrate. A nanoscale gap between the dielectric wavegilide and the metallic substrate leads to deep subwavelength optical energy confinement with ultralow mode propagation loss and hence results in the enhanced optical forces at low input optical power, as numerically demonstrated by both Maxwell's stress tensor formalism and the coupled mode theory analysis. Moreover, the hybridization between the surface plasmon modes and waveguide modes allows efficient optical trapping of single dielectric nanoparticle with size of only several nanometers in the gap region, manifesting various optomechanical applications such as nanoscale optical tweezers.
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