Optimization of resonant optical sensors

Area of Science:

• Optics
• Photonics
• Sensor Technology

Background:

• Resonant optical sensors rely on transmission and reflection spectra of optical resonators.
• Understanding peak sharpness and steepness is crucial for optimizing sensor sensitivity.
• Known resonator losses define the theoretical limits for peak shape optimization.

Purpose of the Study:

• To determine the optimal resonant peak shape for maximum sensitivity in optical sensors.
• To compare the sensitivity of transmission and reflection spectra.
• To explore the impact of resonator structure modifications on sensor performance.

Main Methods:

• Investigated sensitivity based on transmission and reflection spectra measurements.
• Solved an optimization problem for peak shape under known resonator losses.
• Analyzed a model of two coupled resonators to assess structural modifications.

Main Results:

• Reflection spectra demonstrate higher sensitivity than transmission spectra for separated peaks.
• Modified resonator structures can significantly enhance transmission spectrum sensitivity.
• Separated resonant peaks in the reflection spectrum remain the most sensitive configuration.

Conclusions:

• The reflection spectrum is inherently more sensitive for detecting resonant optical sensor changes.
• While transmission sensitivity can be improved through structural design, reflection-based sensing with separated peaks offers optimal performance.
• This research provides insights into optimizing resonant optical sensor design for enhanced sensitivity.