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Multiplexed rectangular dielectric gratings with multiple narrow-band refractive index filtering and sensing
Aibibula Abudula1,2,3, Paiziliya Maitiaximu4,5,6, Abulizi Abulaiti7
1College of Xinjiang Uyghur Medicine, Hoten, 848000, China. aabudula@126.com.
Scientific Reports
|January 28, 2024
Summary
We developed a novel dielectric grating and waveguide structure for multi-band optical filters and sensors. This design achieves high sensitivity for refractive index sensing across TE and TM polarizations.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Optical filters and sensors are crucial components in various photonic applications.
- Existing designs often face limitations in multi-band operation and sensitivity.
Purpose of the Study:
- To propose a novel compound structure for multi-band optical filters and sensors.
- To demonstrate its capability as a highly sensitive refractive index sensing platform.
Main Methods:
- Designing a low-loss compound structure with a multiplexed rectangular dielectric grating and a waveguide layer.
- Utilizing waveguide resonant modes and hybrid surface plasmons (SP) for TE and TM polarization sensing.
- Manipulating structural parameters to control multi-resonant modes at distinct wavelengths.
Main Results:
- Achieved spectral shifts of 110–131 nm/RIU (TE) and 80–114 nm/RIU (TM).
- Obtained Figure of Merit (FOM) up to 26.2/RIU (TE) and 8.1/RIU (TM).
- Demonstrated accurate discernment of multiple analytes across a broad spectral range.
Conclusions:
- The proposed structure offers enhanced flexibility for multi-band optical applications.
- It presents a novel, highly sensitive platform for refractive index sensing.
- Potential applications include advanced optical filters, sensors, and photodetectors.
