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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Plasmonic Metalens to Generate an Airy Beam.

Citlalli T Sosa-Sánchez¹, Ricardo Téllez-Limón²

¹Unidad Foránea Monterrey, Centro de Investigación Científica y de Educación Superior de Ensenada, Alianza Centro 504, PIIT, Apodaca 66629, Mexico.

Nanomaterials (Basel, Switzerland)

|September 28, 2023

Summary

Researchers designed a plasmonic metalens using nanoslits to generate airy beams. This flat optical device offers self-healing and bending properties for light, with potential in focusing applications.

Keywords:

airy beam metalenses metaphotonics plasmonics

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Area of Science:

Optics and Photonics
Metamaterials
Plasmonics

Background:

Airy beams are unique non-diffracting beams with applications in optics.
Generating airy beams typically requires complex optical setups.
Cylindrical geometries can be used to modify wavefronts in one dimension.

Purpose of the Study:

To design a compact plasmonic metalens for generating airy beams.
To demonstrate the feasibility of creating airy beams using a simple metasurface.
To investigate the propagation characteristics and efficiency of the generated airy beams.

Main Methods:

Design of a cylindrical plasmonic metalens composed of nanoslits in a gold thin film.
Numerical simulation to modulate the phase of an incident Gaussian beam.
Matching the wavefront phase to generate an airy beam at the output plane.

Main Results:

Successful generation of an airy beam using the designed plasmonic metalens.
Demonstration of airy beam properties, including self-healing and bending during propagation.
Achieved a transmission efficiency of approximately 60%.

Conclusions:

A simple cylindrical plasmonic metalens can effectively generate airy beams.
The proposed metasurface offers a novel approach for flat optics and light-focusing applications.
The demonstrated airy beam properties open new avenues for optical manipulation.