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Achromatic vector vortex beams from a glass cone.

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Summary
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Researchers used a solid glass cone to reflect light, creating beams with orbital angular momentum and radial polarization. This cost-effective method works across the visible spectrum for broadband applications.

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Area of Science:

  • Optics and Photonics
  • Light-Matter Interactions

Background:

  • Light reflection follows Fresnel's laws, involving polarization-dependent phase shifts.
  • Conical reflectors exhibit cylindrical symmetry, leading to angular variations in phase shifts.

Purpose of the Study:

  • To investigate phase and polarization profiles of light reflected from a solid glass cone.
  • To explore the generation of light modes with phase and polarization singularities.

Main Methods:

  • Observation of phase and polarization profiles of back-reflected light from a solid glass cone.
  • Measurement of white light polarization profiles to assess spectral stability.

Main Results:

  • Circularly polarized input light generated beams with orbital angular momentum.
  • These beams were trivially converted into radially polarized beams.
  • Fresnel coefficients demonstrated stability across the visible spectrum.

Conclusions:

  • Solid glass cones offer a cost-effective method for generating broadband orbital angular momentum and radially polarized beams.
  • The technique enables the creation of light modes with singularities.