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Reverse optical forces in negative index dielectric waveguide arrays.

Alessandro Salandrino1, Demetrios N Christodoulides

  • 1CREOL/College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA. asalan@creol.ucf.edu

Optics Letters
|August 18, 2011
PubMed
Summary
This summary is machine-generated.

Optical forces on dipolar particles are dictated by the propagation vector in optical fields. Reversing these forces in homogeneous media is impossible, but optical tractor fields can be generated in negative index environments.

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Area of Science:

  • Physics
  • Optics
  • Nanotechnology

Background:

  • Nonconservative optical forces are crucial for manipulating small particles.
  • Understanding force orientation is key to controlling particle movement.
  • Previous studies often focused on conservative forces or different field configurations.

Purpose of the Study:

  • To investigate nonconservative optical forces on dipolar particles in longitudinally invariant optical fields.
  • To determine the factors governing the orientation of these optical forces.
  • To explore possibilities for generating optical tractor fields.

Main Methods:

  • Theoretical analysis of optical forces in specific field configurations.
  • Examination of the role of the propagation vector in force orientation.
  • Simulation or analysis of optical fields within negative index metamaterials.

Main Results:

  • The orientation of nonconservative optical forces is strictly determined by the propagation vector.
  • Optical force reversal is not achievable in homogeneous optical media.
  • Translation invariant optical tractor fields can be generated in negative index waveguide arrays.

Conclusions:

  • The propagation vector is the primary determinant of nonconservative optical force direction.
  • Homogeneous media present fundamental limitations for optical force reversal.
  • Dielectric waveguide arrays with negative refractive indices offer a pathway to creating novel optical tractor fields.