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Optical vortex beam generator at nanoscale level.

Denis Garoli¹, Pierfrancesco Zilio¹, Yuri Gorodetski²

¹Istituto Italiano di Tecnologia - Via Morego, 30, I-16163 Genova, Italy.

Scientific Reports

|July 13, 2016

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Researchers developed a nanoscale plasmonic optical vortex emitter that generates orbital angular momentum (OAM) beams from circularly polarized light. The OAM state can be tuned by changing light polarization, enabling scalable integration for advanced optical applications.

Area of Science:

Photonics and Nanotechnology
Plasmonics
Optical Metamaterials

Background:

Optical beams with orbital angular momentum (OAM) have diverse applications.
Generating OAM beams at the nanoscale is crucial for integrated photonic devices.

Purpose of the Study:

To design and demonstrate a nanoscale plasmonic optical vortex emitter.
To enable the generation and control of OAM beams using subwavelength structures.

Main Methods:

Design and fabrication of a metal-insulator-metal (MIM) holey plasmonic vortex lens (PVL).
Experimental demonstration of converting circularly polarized light into a far-field propagating OAM state.

Main Results:

The plasmonic element successfully generated OAM-carrying beams from subwavelength apertures.

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The handedness of the output OAM can be externally controlled by switching the incident light's polarization.

The device operates at the nanoscale with a radius of a few micrometers.

Conclusions:

The developed plasmonic optical vortex emitter offers a novel method for nanoscale OAM generation.
The ability to tune OAM and the potential for array fabrication pave the way for large-scale integration of optical vortex emitters.