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Coupling-driven optimization of on-chip optical mode localization sensing.

Shumeng Wang, Xiangming Xu, Oleg Ageev

|December 19, 2025

Summary

This summary is machine-generated.

Optical mode localization sensing offers ultra-sensitive detection. This study optimizes sensor performance by exploring coupling coefficients, revealing a trade-off between sensitivity and measurable range for enhanced precision.

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Area of Science:

Photonics
Optical Sensing
Nanotechnology

Background:

Optical mode localization sensing provides significant sensitivity enhancements over traditional frequency-shift methods.
Ultra-sensitive detection is crucial for various advanced applications.
Optimizing performance requires understanding key limiting parameters.

Purpose of the Study:

To investigate the impact of coupling coefficients on optical mode localization sensor performance.
To provide design guidelines for optimizing ultra-sensitive optical sensors.
To characterize the relationship between sensitivity, dynamic range, and measurable range.

Main Methods:

Utilized on-chip coupled microring resonators with precisely tuned coupling coefficients.
Varied gap and length to control coupling (K = 0.5527-0.2775).
Characterized split mode dynamics under external perturbations.

Main Results:

Achieved significant sensitivity improvements, with the anti-symmetric mode showing a 46-fold increase and the symmetric mode a 7.5-fold increase at minimal coupling.
Identified a trade-off: higher sensitivity leads to a narrower measurable perturbation window due to dynamic range limitations.
Established comprehensive relationships between coupling strength, sensitivity, and range constraints.

Conclusions:

Coupling strength is a critical parameter for optimizing optical mode localization sensors.
Sensor design must balance high sensitivity with an adequate measurable range.
This work provides foundational insights for developing high-precision optical mode localization sensors.