Controlling Lateral Fano Interference Optical Force with Au-Ge2Sb2Te5 Hybrid Nanostructure

Tun Cao, Jiaxin Bao, Libang Mao, Tianhang Zhang, Andrey Novitsky, Manuel Nieto-Vesperinas, Cheng-Wei Qiu

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Abstract

We numerically demonstrate that a pronounced dipole-quadrupole (DQ) Fano resonance (FR) induced lateral force can be exerted on a dielectric particle 80 nm in radius (R-sphere = 80 nm) that is placed 5 nm above an asymmetric bow-tie nanoantenna array based on Au/Ge2Sb2Te5 dual layers. The DQ-FR-induced lateral force achieves a broad tuning range in the mid-infrared region by changing the states of the Ge2Sb2Te5 dielectric layer between amorphous and crystalline and in turn pushes the nanoparticle sideways in the opposite direction for a given wavelength. The mechanism of lateral force reversal is revealed through optical singularity in the Poynting vector. A thermal-electric simulation is adopted to investigate the temporal change of the Ge2Sb2Te5 film's temperature, which demonstrates the possibility of transiting the Ge2Sb2Te5 state by electrical heating. Our mechanism by tailoring the DQ-FR-induced lateral force presents clear advantages over the conventional nanoparticle manipulation techniques: it possesses a pronounced sideways force under a low incident light intensity of 10 mW/mu m(2), a fast switching time of 2.6 mu s, and a large tunable wavelength range. It results in a better freedom in flexible nanomechanical control and may provide a new means of biomedical sensing and nano -optical conveyor belts.
Original languageEnglish
JournalACS Photonics
Volume3
Issue number10
Pages (from-to)1934-1942
ISSN2330-4022
DOIs
Publication statusPublished - 2016

Keywords

  • NANOSCIENCE
  • MATERIALS
  • OPTICS
  • PHYSICS,
  • PHASE-CHANGE MATERIALS
  • ALL-DIELECTRIC OLIGOMERS
  • WAVE-GUIDES
  • PLASMONIC NANOPARTICLES
  • POYNTING VECTOR
  • CONVEYOR BELT
  • RESONANCES
  • MANIPULATION
  • SURFACE
  • LIGHT
  • phase change material
  • Fano resonance
  • optical manipulation
  • surface plasmons
  • optical force

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