Optical refractive index sensor with Fano resonance based on original MIM waveguide structure

• DOI: 10.1016/j.rinp.2021.103858
• Publication Date: 2021-01-21T23:47:03Z
• Authors: Jun Zhu; Changsong Wu
• Keywords: Waveguide; Fano resonance; Metal-insulator-metal; Array data structure

In recent years, optical refractive index sensors have received significant attention in the field of chemical and biological sensing owing to advantages small size. order achieve requirements structure high sensitivity nano sensing, this paper proposes a Fano resonance–based waveguide which metal-insulator-metal (MIM) using surface plasmons U-shaped cavities are coupled unilaterally. The transmittance spectrum waveguide-coupled resonator with different incident light wavelengths can be obtained. cavity semi-annular straight superimposed on each other form resonance spectrum. An extremely narrow impedance is formed proposed obtain superior performance at nanoscale after optimisation. results confirm that optimised up 825 nm/RIU. experiments show could accurately identify five pure edible vegetable oils room temperature. But also shown it not effectively distinguish between mixed oils. This provides an effective reference for design development application