Research on an all-medium two-parameter metasurface sensor based on Fano resonance

Area of Science:

• Photonics and Nanotechnology
• Optical Sensing
• Metamaterial Applications

Background:

• All-dielectric metasurfaces offer lower losses and better sensing than metallic counterparts.
• Current metasurfaces often lack dual-parameter sensing capabilities and are sensitive to incident light angles.
• Structural asymmetry is explored as a design principle for advanced metasurface sensors.

Purpose of the Study:

• To design and analyze an all-dielectric dual-parameter sensor with improved performance.
• To overcome the limitations of single-parameter sensing and angular sensitivity in metasurface sensors.
• To achieve high sensitivity for refractive index and temperature in biosolution sensing.

Main Methods:

• Design of an all-dielectric metasurface using silicon elements on a quartz substrate.
• Excitation of two distinct Fano resonance peaks via magnetic dipole modes in the near-infrared spectrum.
• Analysis of polarization insensitivity and stability under oblique incidence.

Main Results:

• The metasurface design exhibits two distinct Fano resonance peaks.
• The sensor shows excellent polarization insensitivity and stability under oblique incidence.
• Maximum refractive index sensitivity reached 404.43 nm/RIU and temperature sensitivity reached 51.76 pm/°C.

Conclusions:

• The proposed all-dielectric metasurface enables dual-parameter sensing with high sensitivity.
• The design demonstrates robustness against polarization changes and varying incident angles.
• This technology holds significant promise for advanced biosolution sensing applications.