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Ultra-narrow linewidth transmission filters based on the cladding mode assisted Fabry-Perot effect in a planar
Applied Optics
|October 18, 2022
Summary
We developed a tunable Fabry-Perot interferometer using Bragg gratings and liquid crystals. This device utilizes cladding modes for resonance tuning, enabling applications in integrated optics.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Fabry-Perot interferometers are crucial optical devices.
- Tuning optical resonances is essential for advanced photonic applications.
- Liquid crystals offer tunable optical properties.
Purpose of the Study:
- To propose and analyze a novel tunable frequency Fabry-Perot interferometer.
- To investigate the use of counterpropagating cladding modes for tuning.
- To demonstrate liquid crystal integration for resonance control.
Main Methods:
- Full vector modal analysis of Bragg grating (BG) reflectors.
- Incorporation of cavity effects using phase matrix methods.
- Utilizing liquid crystal evanescent field for tuning.
Main Results:
- Accurate explanation of cavity resonances by incorporating phase shifts in BG periods.
- Demonstration of tuning cavity resonance across the entire free-spectral range.
- Successful application of cladding mode evanescent field for tuning.
Conclusions:
- The proposed device offers efficient tuning of optical resonances.
- Liquid crystal integration provides broad tuning capabilities.
- This work facilitates the design of highly tunable integrated optical Fabry-Perot interferometers.
