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Surface relief formation with light possessing multiple vortices.

Junjie Zhao1, Kazuro Kizaki1, Atsushi Taguchi2

  • 1Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai, Japan.

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Summary
This summary is machine-generated.

Researchers demonstrate surface relief formation using non-degenerate hybrid vortex modes. This light-matter interaction reveals new insights into spin-orbit coupling and enables chiral structure fabrication.

Keywords:
optical vorticesorbital angular momentumspin angular momentumsurface relief

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Light-matter interactions are fundamental to materials processing.
  • Vortex beams, characterized by orbital angular momentum (OAM), offer unique light-matter interaction possibilities.
  • Non-degenerate hybrid vortex modes, a superposition of Laguerre-Gaussian (LG) modes, possess complex phase structures and carry OAM.

Purpose of the Study:

  • To demonstrate surface relief formation using non-degenerate hybrid vortex modes.
  • To investigate the underlying light-matter interaction mechanisms involving spin angular momentum (SAM) and OAM coupling.
  • To explore the potential for fabricating novel chiral surface structures.

Main Methods:

  • Coherent superposition of two Laguerre-Gaussian (LG) modes with different OAM indices to generate non-degenerate hybrid vortex modes.
  • Irradiation of material with these engineered vortex modes.
  • Analysis of the resulting surface relief structures, including visualization of vortex fields and phase singularities.

Main Results:

  • Successful fabrication of surface relief structures via irradiation with non-degenerate hybrid vortex modes.
  • Observation of fist-like protrusions in surface relief, correlating with localized vortex fields and phase singularities.
  • Demonstration of SAM-OAM coupling effects influencing the material modification process.

Conclusions:

  • Non-degenerate hybrid vortex modes can induce specific surface relief patterns.
  • The findings provide insights into fundamental light-matter interactions and vortex lattice formation.
  • A novel method for fabricating chiral surface relief structures with potential applications in optical data storage and metasurfaces is presented.