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Moiré volume Bragg grating filter with tunable bandwidth.
Optics Express
|October 17, 2014
Summary
We developed a novel narrowband optical filter using moiré volume Bragg gratings. This filter offers tunable bandwidth at a fixed resonant wavelength, demonstrated experimentally at 1064 nm.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Narrowband optical filters are crucial for various applications, including spectroscopy and telecommunications.
- Existing filters often face limitations in tunability, bandwidth control, or aperture size.
Purpose of the Study:
- To propose and demonstrate a monolithic large-aperture narrowband optical filter with tunable bandwidth.
- To explore the capabilities of moiré volume Bragg gratings for advanced optical filtering.
Main Methods:
- Fabrication of a moiré volume Bragg grating by sequentially recording two gratings with slightly different resonant wavelengths.
- Achieving a specific longitudinal envelope profile by precise specimen cutting.
- Tuning the filter's bandwidth by adjusting the incidence position.
Main Results:
- Demonstrated a monolithic filter with a tunable transmission peak bandwidth.
- Achieved bandwidth tunability from 30-90 pm at a fixed resonant wavelength of 1064 nm.
- Validated analytical expressions for tunable bandwidth with experimental data.
Conclusions:
- The proposed moiré volume Bragg grating offers a novel approach for creating tunable narrowband optical filters.
- This technology enables precise control over filter bandwidth while maintaining a fixed resonant wavelength.
- The large-aperture design and tunable bandwidth make it suitable for advanced optical systems.
