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Helicity-Driven Ratchet Effect Enhanced by Plasmons.

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Physical Review Letters
|July 22, 2015
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Summary
This summary is machine-generated.

The ratchet effect, a radiation-induced current, is significantly boosted near plasmonic resonances, showing unique polarization behavior. This enhancement, especially with circular polarization, can dramatically increase current in high-mobility materials.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • The ratchet effect describes a direct current generated by radiation in asymmetric, modulated structures.
  • Plasmonic resonances offer unique optical and electronic properties in nanostructured materials.

Purpose of the Study:

  • To investigate the enhancement of the ratchet effect near plasmonic resonances.
  • To explore the polarization dependence of the radiation-induced current.

Main Methods:

  • Theoretical modeling of ratchet current in periodically modulated structures.
  • Analysis of plasmonic resonance effects on current generation.
  • Investigation of polarization and helicity dependence of the current.

Main Results:

  • Ratchet effect is dramatically enhanced near plasmonic resonances.
  • A nontrivial polarization dependence of the current is observed.
  • Circular polarization leads to a sign change in the perpendicular current component with helicity inversion.
  • In high-mobility structures, plasmonic effects can increase the perpendicular current by orders of magnitude, exceeding the parallel component.
  • In suppressed resonance systems, Maxwell relaxation governs the ratchet current.

Conclusions:

  • Plasmonic resonances significantly amplify the ratchet effect, offering new avenues for controlling radiation-induced currents.
  • The polarization dependence provides a mechanism for helicity-sensitive current generation.
  • Understanding these effects is crucial for designing advanced optoelectronic devices.