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Updated: Nov 12, 2025
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
22.2K
Generation of a sub-diffracted Bessel beam via diffraction interference in a combined amplitude structure.
Optics Express
|March 17, 2021
Summary
Researchers developed a novel amplitude structure to create sub-diffracted Bessel beams. This technique enables subwavelength beam generation with low side-lobes for advanced applications.
Area of Science:
- Optics and Photonics
- Nanotechnology
Background:
- Bessel beams are known for their non-diffracting properties over long distances.
- Generating subwavelength Bessel beams with controlled characteristics is challenging.
Purpose of the Study:
- To theoretically investigate a novel combined amplitude structure for producing sub-diffracted Bessel beams.
- To achieve a subwavelength Bessel beam with a small size and long working distance.
Main Methods:
- Theoretical investigation using diffraction interference.
- Utilizing a combined amplitude structure composed of a spiral slit and radial grating.
- Numerical realization of beam generation when illuminated by a vortex beam.
Main Results:
- A subwavelength Bessel beam with a size of 0.39λ and a working distance of approximately 100 µm was numerically realized.
- Tailoring spiral slit parameters allowed for a longer sub-diffracted Bessel beam.
- The generated Bessel beam exhibited low-energy side-lobes.
Conclusions:
- A simple combined amplitude structure can effectively produce sub-diffracted Bessel beams.
- The generated beams possess unique features suitable for applications in nanoparticle manipulation, super-resolution imaging, and lithography.
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