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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
Published on: July 18, 2015
Ultra-wide detuning planar Bragg grating fabrication technique based on direct UV grating writing with electro-optic
C Sima1, J C Gates, H L Rogers
1Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK. Chaotan.Sima@soton.ac.uk
Optics Express
|July 12, 2013
Summary
A novel UV grating writing technique uses phase-controlled interferometry for precise Bragg grating fabrication. This method enables wider wavelength tuning and efficient control over grating parameters on a silica-on-silicon platform.
Area of Science:
- Photonics and optical engineering.
- Materials science and nanotechnology.
Background:
- Direct UV writing is a key technique for fabricating optical gratings.
- Existing UV writing methods have limitations in wavelength detuning range and control over grating parameters.
Purpose of the Study:
- To propose and demonstrate a direct UV grating writing technique based on phase-controlled interferometry.
- To achieve a wider wavelength detuning range and enhanced control over Bragg grating and waveguide parameters.
Main Methods:
- Utilizing a phase-controlled interferometry setup for direct UV grating writing.
- Employing electro-optic phase modulation to manipulate the fringe pattern and control grating parameters.
- Fabrication on a silica-on-silicon platform.
Main Results:
- Demonstrated a wider wavelength detuning range compared to previous UV writing technologies.
- Successfully fabricated various grating structures with refractive index apodization, phase shifts, and index contrasts up to 0.8 × 10(-3).
- Achieved Bragg grating fabrication from 1200 nm to 1900 nm under software control with minimal reflectivity decrease over a 250 nm bandwidth.
Conclusions:
- The proposed phase-controlled interferometry technique offers significant time/energy efficiency.
- This method simplifies the optical layout and fabrication process for Bragg gratings.
- The technique provides precise software control over grating parameters and broad wavelength tunability.
