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Effect of Dispersion-Enhanced Sensitivity in a Two-Mode Optical Waveguide with an Asymmetric Diffraction Grating
1Laboratory of Optical Materials and Structures, Rzhanov Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia.
Sensors (Basel, Switzerland)
|August 28, 2021
Summary
This study introduces bimodal silicon photonics sensors that utilize inter-mode interaction for enhanced sensitivity. These novel optical sensors demonstrate significantly higher sensitivity than traditional single-mode designs.
Area of Science:
- Silicon photonics
- Optical sensing
Background:
- Silicon photonics offers high efficiency for optical sensor development.
- Traditional optical sensors rely on single-mode waveguides.
Purpose of the Study:
- To develop a novel concept of bimodal sensors using inter-mode interaction in two-mode waveguides.
- To leverage unique dispersion properties for enhanced sensor sensitivity.
Main Methods:
- Investigating inter-mode interaction in two-mode optical waveguides with asymmetric periodic perturbation.
- Utilizing numerical calculation methods to analyze sensor performance.
Main Results:
- Demonstrated collinear Bragg diffraction with mode number transformation.
- Achieved "dispersion-enhanced sensitivity" with Bragg wavelength highly dependent on refractive index changes.
- Numerical calculations show homogeneous sensitivity exceeding 3000 nm/RIU.
Conclusions:
- Bimodal sensors offer significantly higher sensitivity compared to single-mode waveguide sensors.
- The "effect of dispersion-enhanced sensitivity" enables superior optical sensing performance.
