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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

Electron spin polarization-based integrated photonic devices.

Christopher J Trowbridge1, Benjamin M Norman, Jason Stephens

  • 1Department of Applied Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, USA.

Optics Express
|September 22, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed new semiconductor devices for nonreciprocal mode conversion, enabling electrically controlled optical isolators and other components for photonic integrated circuits.

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Area of Science:

  • Optoelectronics
  • Semiconductor physics
  • Photonics

Background:

  • Photonic integrated circuits (PICs) require optical isolators for serial component integration.
  • Current isolators are bulky and lack efficient electrical control.
  • Nonreciprocal optical propagation is essential for isolator functionality.

Purpose of the Study:

  • To propose and analyze a novel class of integrated photonic devices for nonreciprocal mode conversion.
  • To enable electrically controlled optical isolators, circulators, modulators, and switches.
  • To investigate the impact of semiconductor spin polarization on optical nonreciprocity.

Main Methods:

  • Utilizing electrically generated electron spin polarization in semiconductors.
  • Implementing TE/TM mode conversion for nonreciprocal signal propagation.
  • Analyzing waveguide birefringence and absorption loss effects on device performance.

Main Results:

  • Demonstrated a mechanism for nonreciprocal TE/TM mode conversion using electron spin polarization.
  • Showcased the potential for active electrical control over non-reciprocal coupling rates.
  • Identified birefringence and absorption loss as key performance limitations.

Conclusions:

  • Electron spin polarization in semiconductors offers a pathway to integrated, electrically controlled nonreciprocal photonic devices.
  • The proposed devices can overcome limitations of current optical isolators.
  • Further research is needed to mitigate loss and birefringence for optimal performance.