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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Ultra-compact photonic crystal based polarization rotator
Khadijeh Bayat1, Sujeet K Chaudhuri, Safieddin Safavi-Naeini
1Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada. kbayat@uwaterloo.ca
Optics Express
|April 29, 2009
Summary
This study introduces a novel photonic crystal polarization rotator. The device achieves complete polarization rotation over a short propagation length with high coupling efficiency.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Polarization rotators are essential components in integrated optics.
- Existing designs often face limitations in efficiency or size.
- Photonic crystals offer unique properties for optical device miniaturization.
Purpose of the Study:
- To introduce, design, and simulate an asymmetrically loaded photonic crystal based polarization rotator.
- To achieve complete polarization rotation with high efficiency in a compact structure.
Main Methods:
- Utilizing coupled mode theory with semi-vectorial modes for design.
- Employing plane wave expansion methods for structural analysis.
- 3D-Finite-Difference Time-Domain (3D-FDTD) simulations for validation.
Main Results:
- Complete polarization rotation achieved over a propagation length of 12 lambda.
- Coupling efficiency exceeding 90% within the normalized frequency band of 0.258-0.262.
- Simulation results align with coupled mode analysis.
Conclusions:
- The proposed asymmetrically loaded photonic crystal polarization rotator is a viable and efficient solution.
- The design demonstrates potential for compact and high-performance optical systems.
- Further research can explore fabrication and experimental validation.
