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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Optimizing focus: switchable modes and sub-diffraction spots in inverse circular Airy beams.

Lai Chen, Chengjian Tao, Li-Gang Wang

|May 15, 2024

Summary

This summary is machine-generated.

Linearly polarized inverse circular Airy beams (ICABs) create unique focal profiles, including dual foci, due to microscope objective constraints. These beams offer a sub-diffraction-limit focal spot size for advanced optical applications.

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Last Updated: Jun 26, 2025

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$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

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Published on: April 25, 2019

Area of Science:

Optics and Photonics
Laser Physics
Nanotechnology

Background:

Traditional Gaussian beams (GBs) are limited by the diffraction limit for focusing.
Inverse circular Airy beams (ICABs) offer controllable beam shaping properties.
Understanding tight-focusing characteristics is crucial for advanced optical applications.

Purpose of the Study:

To experimentally investigate the tight-focusing properties of linearly polarized inverse circular Airy beams (ICABs).
To analyze the focal spot characteristics and compare them with traditional Gaussian beams.
To explore the potential applications of ICABs in optical manipulation and imaging.

Main Methods:

Experimental generation and characterization of linearly polarized ICABs.
Tight-focusing experiments using a microscope objective (MO).
Analysis of focal spot profiles and size measurements.

Main Results:

Tightly focused ICABs exhibit Bessel-like, needle-like, or dual foci profiles based on the main ring's radius relative to a critical radius.
Dual foci formation is influenced by the constrained entrance aperture of the MO.
A focal spot size of 245 nm was achieved, a 26.4% reduction below the diffraction limit.
ICABs demonstrated superior focal spot size compared to GBs.

Conclusions:

ICABs possess unique tight-focusing characteristics, including controllable multi-foci generation.
The observed sub-diffraction-limit focal spot size offers significant advantages over conventional beams.
ICABs show promise for applications in optical multi-plane particle trapping, conveying, and super-resolution imaging.