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Related Experiment Video

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

Nondiffracting transversally polarized beam.

G H Yuan¹, S B Wei, X-C Yuan

¹School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore.

|September 3, 2011

Summary

A novel method generates a long-focus, transversally polarized beam using a spiral phase hologram and high-NA lens. This creates a central bright channel by eliminating polarization singularity at the beam

Area of Science:

Optics and Photonics
Electromagnetism
Beam Physics

Background:

Generating beams with specific polarization states is crucial for applications in microscopy, optical trapping, and information processing.
Controlling polarization at the focal plane of high numerical aperture (NA) systems presents significant challenges due to strong field vector transformations.

Purpose of the Study:

To demonstrate the generation of a nondiffracting, transversally polarized beam with an extended depth of focus.
To analyze the polarization characteristics of the generated beam near the focal plane.

Main Methods:

An azimuthally polarized beam was transmitted through a multibelt spiral phase hologram.
The resulting beam was highly focused using a high-NA lens.
Stokes polarization parameters were calculated to analyze the polarization state of the wavefront.

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Main Results:

A relatively long depth of focus (approximately 4.84λ) was achieved for the electric field.
The electric field components were found to be exclusively radial and azimuthal.
Spatially varying, entirely transversally polarized light was observed near the focal plane.
The polarization singularity disappeared at the beam center.

Conclusions:

The proposed method successfully generates a nondiffracting, transversally polarized beam with a long depth of focus.
The absence of polarization singularity at the beam center enables the formation of a central bright channel.
The detailed analysis of Stokes parameters confirms the unique polarization properties of the generated beam.