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

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Linear to radial polarization conversion in the THz domain using a passive system.

T Grosjean¹, F Baida, R Adam

¹Institut FEMTO-ST, Université de Franche-Comté, UMR 6174 CNRS, Département d'Optique P.M. Duffieux, Besançon cedex, France. thierry.grosjean@univ-fcomte.fr

|July 8, 2009

Summary

This study presents a passive system that converts linearly polarized terahertz (THz) beams into radially polarized ones using a circular waveguide and tapers. The validated 0.1 THz prototype is adaptable for higher frequencies.

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Area of Science:

Terahertz (THz) technology
Waveguide optics
Polarization control

Background:

Efficient manipulation of terahertz (THz) beams is crucial for advanced applications.
Converting linear polarization to radial polarization is a key challenge in THz optics.

Purpose of the Study:

To develop and validate a passive system for converting linearly polarized THz beams to radially polarized beams.
To adapt existing optical fiber concepts for THz waveguide applications.

Main Methods:

Utilized a circular waveguide with two tapers to achieve mode selection.
Extended optical fiber mode selection principles to THz frequencies.
Fabricated and tested a prototype system at 0.1 THz.

Main Results:

Successfully converted a linearly polarized THz beam into a radially polarized output.
Demonstrated the system's functionality at 0.1 THz.
Confirmed the scalability of the design for higher THz frequencies via size reduction.

Conclusions:

The proposed passive system effectively achieves THz beam polarization conversion.
The waveguide-based approach offers a viable alternative to optical fiber methods for THz applications.
The design's simplicity allows for easy adaptation to various THz frequencies.