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Creation of Low-Loss Triple-Ring Optical Filter via Direct Binary Search Inverse Design
Yuchen Hu1, Tong Wang1, Wen Zhou1
1College of Future Information Technology, Fudan University, Shanghai 200438, China.
Sensors (Basel, Switzerland)
|September 27, 2025
Summary
We designed a novel triple-ring optical filter using inverse design, achieving high performance with a compact footprint. This advanced photonic device shows promise for laser cavities, WDM systems, and sensing applications.
Area of Science:
- Photonics
- Optical Engineering
- Nanotechnology
Background:
- Optical filters are crucial components in various photonic systems.
- Existing designs often face limitations in performance, size, or fabrication complexity.
Purpose of the Study:
- To design and verify a high-performance triple-ring optical filter using inverse design.
- To explore the application potential of such filters in advanced optical systems.
Main Methods:
- Direct binary search inverse design for optimizing coupling coefficients.
- Temporal coupled-mode theory for theoretical spectral analysis.
- 3D finite-difference time-domain simulations for verification.
Main Results:
- Achieved a free spectral range of 86 nm and a narrow spectral linewidth of 0.2 nm.
- Demonstrated low insertion loss (0.4 dB) and high extinction ratio (20 dB).
- Fabricated a compact device with dimensions of 29 μm×46.5 μm.
Conclusions:
- The inverse design approach enables precision engineering of complex photonic devices.
- The triple-ring filter offers significant potential for laser external cavities, WDM systems, and sensing.
- This work establishes a systematic framework for designing advanced photonic devices.
