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Writing Bragg Gratings in Multicore Fibers
08:48

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Published on: April 20, 2016

Compact microfiber Bragg gratings with high-index contrast.

Yanxin Liu1, Chao Meng, A Ping Zhang

  • 1State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.

Optics Letters
|August 18, 2011
PubMed
Summary

Researchers created compact fiber Bragg gratings (FBGs) in microfibers using focused ion beam milling. These micro-fiber Bragg gratings (MFBGs) show high sensitivity for refractive index sensing, enabling miniaturized photonic devices.

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Area of Science:

  • Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Microfibers (MFs) offer unique optical properties for miniaturized devices.
  • Fiber Bragg gratings (FBGs) are crucial for optical sensing and filtering.
  • Fabricating gratings on sub-micron structures presents significant challenges.

Purpose of the Study:

  • To develop a method for fabricating fiber Bragg gratings (FBGs) in microfibers (MFs).
  • To investigate the performance of microfiber Bragg gratings (MFBGs) for refractive index (RI) sensing.
  • To explore the potential of MFBGs as building blocks for compact photonic components.

Main Methods:

  • Fabrication of microfibers (MFs) with diameters less than 2 μm.
  • Utilizing focused ion beam (FIB) milling to create periodic 100 nm-depth grooves on microfiber surfaces.
  • Characterization of grating features, transmission dips, and refractive index (RI) sensing performance.

Main Results:

  • Successfully fabricated micro-fiber Bragg gratings (MFBGs) with transmission dips up to 15 dB.
  • Achieved high-index contrast gratings enabling MFBG lengths as short as 500 μm.
  • Demonstrated a MFBG with a sensitivity of 660 nm/RIU for refractive index sensing.

Conclusions:

  • Focused ion beam milling is an effective technique for creating FBGs in microfibers.
  • The resulting MFBGs are highly compact and exhibit excellent sensing capabilities.
  • These MFBGs are promising for the development of miniaturized photonic devices and components.