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Related Experiment Videos

Polarization-insensitive cross correlation using two-photon absorption in a silicon photodiode.

Reza Salem1, Thomas E Murphy

  • 1Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, USA. rsalem@umd.edu

Optics Letters
|July 21, 2004
PubMed
Summary

We measured how light polarization affects two-photon absorption in silicon photodiodes. This led to a polarization-insensitive optical cross-correlation system design, useful for optical communications.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Materials Science

Background:

  • Two-photon absorption (TPA) is a nonlinear optical process.
  • Silicon photodiodes are crucial for optical detection.
  • Polarization dependence can limit device performance in optical systems.

Purpose of the Study:

  • To experimentally measure the polarization dependence of TPA in silicon photodiodes at 1550 nm.
  • To develop a theoretical model explaining the observed polarization effects.
  • To propose and demonstrate a polarization-insensitive optical cross-correlation system.

Main Methods:

  • Experimental setup for measuring polarization-dependent two-photon absorption.
  • Fabrication and characterization of silicon photodiodes.

Related Experiment Videos

  • Development of a theoretical framework for TPA polarization effects.
  • Design and testing of an optical cross-correlation system.

    • Main Results:

    • Quantified the polarization dependence of two-photon absorption in silicon photodiodes at 1550 nm.
    • Validated a simple theory explaining the experimental observations.
    • Demonstrated a polarization-insensitive optical cross-correlation system under specific conditions.

    Conclusions:

    • The polarization dependence of TPA in silicon photodiodes is measurable and theoretically explainable.
    • A polarization-insensitive optical cross-correlation system is feasible by controlling one input polarization state.
    • This work has implications for robust optical sensing and communication systems.