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Note: a high transmission Faraday optical isolator in the 9.2 μm range.

Laurent Hilico1, Albane Douillet, Jean-Philippe Karr

  • 1Département de Physique, Université d'Evry Val d'Essonne, Bd. F. Mitterrand, 91025 Evry, France. hilico@spectro.jussieu.fr

The Review of Scientific Instruments
|October 7, 2011
PubMed
Summary

Researchers developed an n-doped indium antimonide (InSb) Faraday isolator for mid-infrared light. This device achieved high isolation (31 dB) and low insertion loss (1.9 dB), showing promise for optical applications.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Devices
  • Mid-Infrared Technology

Background:

  • Faraday isolators are crucial components for preventing back-reflection in optical systems.
  • Indium antimonide (InSb) is a promising material for mid-infrared applications due to its unique electronic properties.
  • Developing efficient isolators for the mid-infrared (mid-IR) spectrum is essential for various sensing and communication technologies.

Purpose of the Study:

  • To fabricate and characterize an n-doped InSb-based Faraday isolator operating in the mid-IR wavelength range.
  • To evaluate the performance of the InSb isolator in terms of isolation ratio and insertion loss.
  • To investigate the temperature dependence of the isolator's performance and explore potential improvements.

Main Methods:

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  • Fabrication of an n-doped InSb material.
  • Characterization of the Faraday isolator at a wavelength of 9.2 μm.
  • Measurement of isolation ratio and insertion loss.
  • Analysis of temperature-dependent performance.

    • Main Results:

    • Achieved a high isolation ratio of 31(2) dB.
    • Obtained a low insertion loss of 1.9(3) dB at 9.2 μm.
    • Demonstrated the feasibility of using n-doped InSb for mid-IR Faraday isolators.

    Conclusions:

    • The fabricated n-doped InSb Faraday isolator exhibits excellent performance for mid-IR applications.
    • The device's design is adaptable for a broad wavelength range (7.5–30 μm).
    • Further enhancements, such as a two-stage isolator, could further improve performance.