New Optical Method for the Sucrose Solution Measurement Based on Fano Resonance.

We propose a new method to determine the concentration of a sucrose solution based on Fano resonance, demonstrate that the T -shaped resonator and rectangular resonator structures can realize the Fano resonance, observe higher sensitivity up to 2142 nm/RIU, and use the structure to measure the concentration of a sucrose solution. This work shows that the Fano resonance wavelength removed to longer wavelengths as the concentration of the solution increased, and the resolution of solution concentration is 4. 8 × 1 0 − 9 , which can be used for measuring the concentration of solutions other than sucrose. This research is an important first step towards creating the industrial application of photon properties to extend photon polariton applications throughout the infrared. Angle T-shaped resonator and single rectangular resonator were analyzed. For the single T-shaped resonant cavity, the coupling with the straight waveguide is relatively weak. A narrow stopband at 450 nm can be seen in the transmission spectrum. The transmission spectrum produced by the rectangular cavity is equivalent to a wide continuous state. The complete transmission spectrum of the MIM waveguide structure is observed. An asymmetric Fano resonance line coupled between the two resonators; the peak at λ = 820 nm and the dip at λ = 540 nm can be widely applied in nano plasmon sensors for its high FOM and sensitivity. The magnetic field distribution corresponds to the three spectral lines in (a)–(c). [ABSTRACT FROM AUTHOR]