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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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2D Waveguided Bessel Beam Generated Using Integrated Metasurface-Based Plasmonic Axicon.

Yulong Fan1, Benoît Cluzel2, Marlène Petit2

  • 1Centre de Nanosciences et de Nanotechnologies, CNRS, University Paris-Sud, Université Paris-Saclay, C2N, 10 Boulevard Thomas Gobert, 91120 Palaiseau Cedex, France.

ACS Applied Materials & Interfaces
|April 21, 2020
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Summary

Researchers demonstrate a new method for generating Bessel-type beams using a tiny metasurface axicon lens on a silicon waveguide. This breakthrough enables nanoscale light control for advanced optical devices.

Keywords:
Bessel beamsaxiconoptical metasurfacessilicon photonicssurface plasmon resonances

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Area of Science:

  • Photonics and Nanophotonics
  • Integrated Optics
  • Metamaterials

Background:

  • Bessel beams offer diffraction-free propagation, valuable for optical manipulation and imaging.
  • Metasurfaces provide a powerful platform for miniaturizing optical components.
  • Silicon photonics enables integrated optical circuits.

Purpose of the Study:

  • To report near-field imaging of a diffraction-free Bessel-type beam in a guided wave configuration.
  • To demonstrate a metasurface-based axicon lens for generating Bessel beams on a silicon waveguide.
  • To explore nanoscale light control using plasmonic nanoresonators.

Main Methods:

  • Fabrication of a metasurface-based axicon lens integrated on a silicon waveguide.
  • Utilizing plasmonic nanoresonators to locally engineer the effective index of the waveguide.
  • Near-field imaging to observe the propagation of the generated Bessel-type beam.

Main Results:

  • Successful generation and imaging of a diffraction-free Bessel-type beam.
  • The axicon lens achieved a compact footprint of 11 μm².
  • Demonstrated local control of the effective index via plasmonic nanoresonators.

Conclusions:

  • A generic and adaptable approach for designing nano-engineered optical devices.
  • Metasurface axicons on silicon waveguides offer a pathway to miniaturized photonic components.
  • Plasmonic resonators are effective for nanoscale light manipulation in planar lightwave circuits.