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An optically-interrogated microwave-Poynting-vector sensor using cadmium manganese telluride.

Chia-Chu Chen1, John F Whitaker

  • 1Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109 USA. galenc@umich.edu

Optics Express
|July 1, 2010
PubMed
Summary

A novel sensor using cadmium-manganese-telluride crystals measures microwave electric and magnetic fields. This allows for direct mapping of the Poynting vector, revealing energy flow in microstrip transmission lines.

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Area of Science:

  • Applied Physics
  • Electromagnetics
  • Materials Science

Background:

  • The Poynting vector describes electromagnetic energy flow.
  • Accurate near-field measurements are crucial for microwave devices.
  • Existing methods for Poynting vector mapping can be complex.

Purpose of the Study:

  • To develop a novel sensor for direct Poynting vector measurement in the microwave regime.
  • To utilize a cadmium-manganese-telluride (CdMnTe) crystal for simultaneous electric and magnetic field sensing.
  • To experimentally map the Poynting vector along a microstrip transmission line.

Main Methods:

  • A single-crystal CdMnTe exhibiting Pockels and Faraday effects was employed.
  • Independent measurement of electric and magnetic fields was achieved by controlling optical probe beam polarization.

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  • The Poynting vector was mapped along a 50-Ohm microstrip without complex calculations.

    • Main Results:

    • The sensor successfully mapped the Poynting vector near-field.
    • Energy flow was confirmed to be absent at the load for an open-terminated microstrip.
    • Consistent energy flow along the transmission line was observed for a matched termination.

    Conclusions:

    • The CdMnTe sensor provides a direct and effective method for near-field Poynting vector mapping.
    • The sensor's ability to independently measure electric and magnetic fields simplifies microwave field analysis.
    • This technique offers valuable insights into energy propagation in microwave circuits.