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Related Experiment Video

Updated: Jun 8, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
10:54

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Toward a photoconducting semiconductor RF optical fiber antenna array.

R Davis1, R Rice, A Ballato

  • 1Northrop Grumman Aerospace Systems, One Space Park, Redondo Beach, California 90278, USA.

Applied Optics
|September 22, 2010
PubMed
Summary

Researchers developed a novel optical fiber with a semiconductor core, demonstrating its potential as a tunable antenna element. This photoconductive fiber shows promise for advanced, reconfigurable antenna arrays.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Antenna Technology

Background:

  • Optical fibers with crystalline semiconductor cores can be fabricated using conventional drawing processes.
  • These fibers are anticipated to display photoconductivity when exposed to photons exceeding the core's band gap energy.
  • Such photoconductivity enables the fiber to function as an antenna element, similar to plasma antennas.

Purpose of the Study:

  • To investigate optically induced changes in the electrical conductivity of glass-clad germanium-core optical fibers.
  • To assess the potential of these fibers for use in photoconductive optical fiber antenna arrays.
  • To provide initial device-related results for this emerging technology.

Main Methods:

  • Fabrication of glass-clad germanium-core optical fibers via conventional drawing.

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Published on: April 1, 2020

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Last Updated: Jun 8, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
10:54

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

  • Measurement of RF (5 MHz) photoconductivity to overcome limitations of DC measurements caused by photovoltaic effects.
  • Comparison of fiber photoconductivity with that of bulk germanium crystals.

    • Main Results:

    • Optically induced photoconductivity was observed in the germanium-core optical fiber.
    • The measured photoconductivity, while modest, was comparable to that of the bulk germanium crystals.
    • Photo-carriers generated by absorbed light effectively transformed the semiconductor core from a dielectric to a conductor.

    Conclusions:

    • The study demonstrates the feasibility of using crystalline semiconductor core optical fibers as photoconductive elements.
    • This technology offers a pathway to creating transient antenna elements for low-observable and reconfigurable antenna arrays.
    • Further research can optimize the photoconductive properties for practical antenna applications.