Optical Forces in Hybrid Plasmonic Waveguides
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 waveguide 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. © 2011 American Chemical Society.
X. Yang et al., "Optical Forces in Hybrid Plasmonic Waveguides," Nano Letters, American Chemical Society (ACS), Jan 2011.
The definitive version is available at http://dx.doi.org/10.1021/nl103070n
Mechanical and Aerospace Engineering
Keywords and Phrases
Hybrid Plasmonic Waveguide; Optical Force; Optical Trapping; Surface Plasmon Polariton
Article - Journal
© 2011 American Chemical Society (ACS), All rights reserved.