Figure 5: Simulations of transmission spectra and resonance field distributions of the capped nanoslits.
From: Highly Sensitive Aluminum-Based Biosensors using Tailorable Fano Resonances in Capped Nanostructures
(a) The calculated transmission spectra of the capped aluminum nanoslits with different structure parameters for normally incident TM-polarized light using the FDTD calculation method. The structure parameters were P = 470 nm, H = 60–90 nm, T = 20–80 nm and W = 60 nm. The open circle lines show Fano and Lorentz fitting curves. The extracted Fano factors were −1.89 × 1026, −1.06, −0.71,−1.56 and 0. (b) The resonance field (Ez) distributions for the resonance peaks (P2-P5) and dips (D1-D4) with different Fano factors. (c) The calculated decay lengths at peak and dip wavelengths for the capped nanoslits with different Fano factors. The average decay lengths were 444 and 892 nm for the resonance dip and peak, respectively. The decay length decreased to 338 nm when the Fano factor was −1.06.
