Fig. 2.

a Absorption and reflection spectra of the proposed sensor. Distributions of b the electric field E ₁ and c the magnetic field H ₁ at the resonant wavelength. Distributions of d the electric field E ₀ and e the magnetic field H ₀ at the nonresonant wavelength. Parameters: p = 1200 nm, w = 622 nm, l = 420 nm, t ₁ = 328 nm, t ₂ = 28 nm, and t ₃ = 18 nm