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Broadband dispersion-engineered Bragg grating mirrors for integrated side-coupled Fabry-Pérot resonators
Davide Monopoli1,2,3, S Hadi Badri4,5, Nicola Maraviglia4,5
1Centre for Advanced Photonics and Process Analysis, Munster Technological University, Cork, T12 P928, Ireland. Davide.Monopoli2@mymtu.ie.
Scientific Reports
|May 18, 2026
Summary
We developed silicon nitride Fabry-Pérot resonators with novel Bragg gratings for broadband dispersion control. These devices offer enhanced performance for on-chip lasers, sensing, and nonlinear photonics.
Area of Science:
- Photonics and optical engineering
- Materials science for optical devices
- Nanophotonics and integrated optics
Background:
- Silicon nitride photonics offers a robust platform for integrated optical devices.
- Fabry-Pérot resonators are key components for spectral control and filtering.
- Broadband dispersion engineering is crucial for advanced photonic applications.
Purpose of the Study:
- To design and demonstrate silicon nitride side-coupled Fabry-Pérot resonators.
- To achieve broadband dispersion engineering using uniform and apodised distributed Bragg reflectors.
- To explore applications in hybrid lasers, sensing, and nonlinear photonics.
Main Methods:
- Fabrication of silicon nitride side-coupled Fabry-Pérot resonators.
- Implementation of air-gap Bragg gratings (uniform and apodised).
- Co-optimization of cavity length and waveguide-to-cavity gap for high-Q modes and reflectivity.
Main Results:
- Achieved a broad stopband exceeding 70 nm using air-gap Bragg gratings.
- Demonstrated enhanced dispersion control with apodised gratings, enabling normal-to-anomalous dispersion transitions.
- Obtained high-Q resonant modes and enhanced peak reflectivity through co-optimization.
Conclusions:
- Side-coupled Fabry-Pérot resonators offer a promising platform for broadband dispersion engineering.
- The compact footprint, mode selectivity, and spectral bandwidth control are advantageous.
- These resonators are suitable for resonant mirrors in hybrid on-chip lasers, sensing, and nonlinear photonic systems.
