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Updated: May 15, 2026
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Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Nanohole induced microfiber Bragg gratings.
Ping Zhao1, Yuhua Li, Jihua Zhang
1Wuhan National Laboratory for Optoelectronics & School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
Optics Express
|December 25, 2012
Summary
High-index-contrast microfiber Bragg gratings (MFBGs) were fabricated using femtosecond laser ablation. These novel gratings exhibit enhanced performance and stability, making them suitable for advanced optical applications.
Area of Science:
- Photonics
- Materials Science
- Nanotechnology
Background:
- Microfiber Bragg gratings (MFBGs) are crucial optical components.
- Fabrication methods often face limitations in resolution and efficiency.
Purpose of the Study:
- To demonstrate a novel fabrication technique for high-index-contrast MFBGs.
- To investigate the aging properties of these gratings at room temperature.
Main Methods:
- Utilizing a phase-mask technique with femtosecond laser ablation to create periodic nanoholes in microfibers.
- Achieving sub-micrometer-diameter holes with a femtosecond laser micromachining resolution beyond the diffraction limit.
Main Results:
- Fabrication of MFBGs with an effective negative refractive index change (Δn ~-10⁻³).
- Achieved transmission dips over -23 dB with Gaussian apodization and 3-dB reflection bandwidths up to 1.14 nm.
- Observed a 3 dB increase in grating reflectivity and a 1.35 nm resonant wavelength blue-shift after two weeks at room temperature, with subsequent stability.
Conclusions:
- The developed femtosecond laser ablation method enables efficient fabrication of high-performance MFBGs.
- The gratings demonstrate excellent stability and performance, indicating suitability for sensing, nanophotonics, and nonlinear optics.
