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High-Order Nonlinear Spin-Orbit Interaction on Plasmonic Metasurfaces.

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|November 2, 2020
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Researchers demonstrated high-order nonlinear optical spin-orbit interaction (SOI) on metasurfaces, generating multiple angular momentum states in nonlinear vortex beams. This advances the creation of compact nonlinear optical devices.

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Area of Science:

  • * Nonlinear optics
  • * Metasurface science
  • * Photonics

Background:

  • * Optical spin-orbit interaction (SOI) enables manipulation of light's angular momentum in structured media.
  • * Metasurfaces can generate nonlinear optical beams with tailored spin angular momentum (SAM) and orbital angular momentum (OAM).
  • * Previous nonlinear SOI studies were limited to low-order processes using Gaussian fundamental waves.

Purpose of the Study:

  • * To demonstrate high-order nonlinear optical SOI on metasurfaces.
  • * To generate multiple angular momentum states in nonlinear optical waves.
  • * To reveal the mechanisms behind intrinsic and extrinsic contributions to OAM in nonlinear waves.

Main Methods:

  • * Utilizing plasmonic metasurfaces with tailored topological charges.
  • * Exploiting the SAM and OAM states of the fundamental wave (FW).
  • * Investigating the generation of multiple angular momentum states in nonlinear waves.

Main Results:

  • * Successfully demonstrated high-order nonlinear optical SOI on metasurfaces.
  • * Generated nonlinear waves with multiple angular momentum states.
  • * Elucidated the intrinsic and extrinsic contributions to the OAM of nonlinear waves.

Conclusions:

  • * High-order nonlinear SOI on metasurfaces enables the generation of complex angular momentum states.
  • * This work expands the capabilities of nonlinear vortex beam generation.
  • * Offers new avenues for developing ultracompact nonlinear optical devices.