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Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers
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Highly birefringent silica microfiber.

Yongmin Jung1, Gilberto Brambilla, Kyunghwan Oh

  • 1Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK. mj@orc.soton.ac.uk

Optics Letters
|February 4, 2010
PubMed
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Researchers developed a highly birefringent silica microfiber using adiabatic tapering. This novel microfiber exhibits extremely high group birefringence, enabling advanced polarization control for optical sensors and lasers.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Microfibers offer unique optical properties due to their small dimensions.
  • Controlling light polarization is crucial for many optical applications.
  • Achieving high birefringence in silica microfibers has been a challenge.

Purpose of the Study:

  • To develop a highly birefringent silica microfiber.
  • To investigate the potential of such microfibers for polarization discrimination and control.

Main Methods:

  • Adiabatic tapering of a low-birefringence flat fiber at low temperatures.
  • Characterization of microfiber properties, including cross-sectional ellipticity and group birefringence.

Main Results:

  • Successfully fabricated a silica microfiber with high cross-sectional ellipticity.

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Last Updated: Jun 16, 2026

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  • Achieved extremely high group birefringence (B=5.3x10^-3 at 1550 nm) due to high refractive index contrast with air.
  • Demonstrated the potential for polarization discrimination and control.

    • Conclusions:

    • The developed microfiber exhibits significant potential for advanced optical devices.
    • This work opens new avenues for microfiber-based sensors, resonators, and fiber lasers.