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Area of Science:

  • Photonics
  • Nonlinear optics
  • Condensed matter physics

Background:

  • Simultaneous manipulation of light's degrees of freedom is crucial in photonics.
  • Nonlinear wavefront shaping converts incident light into new frequencies with controlled phase, amplitude, and angular momentum.
  • Reconfigurable control over structured light fields for advanced multimode nonlinear photonics is a significant challenge.

Purpose of the Study:

  • To propose and demonstrate the concept of nonlinear geometric phase in ferroelectric nematic fluids.
  • To achieve reconfigurable control over structured light fields.
  • To explore applications in advanced multimode nonlinear photonics.

Main Methods:

  • Utilizing the spin-dependent nonlinearity phase of the second-order nonlinear susceptibility in ferroelectric nematic fluids.
  • Employing photopatterned q-plates to demonstrate the generation of second-harmonic optical vortices.
  • Cascading linear and nonlinear optical spin-orbit interactions.
  • Investigating dynamic tunability via temperature, electric field, and twisted elastic force.

Main Results:

  • Demonstrated the generation of second-harmonic optical vortices with spin-locked topological charges.
  • Showcased dynamic tunability of second-harmonic structured light.
  • Established a novel approach for nonlinear geometric phase manipulation.

Conclusions:

  • The proposed strategy opens new avenues for reconfigurable nonlinear photonics.
  • Potential applications include optical communications, quantum computing, and high-resolution imaging.
  • This work advances the control of light-matter interactions in advanced optical systems.