Figure 4: Surface sensitivity tests for capped aluminum nanoslits with different Fano factors.
From: Highly Sensitive Aluminum-Based Biosensors using Tailorable Fano Resonances in Capped Nanostructures
(a) The transmission spectra of capped aluminum nanoslits with different structure parameters in air for normally incident TM-polarized light. The structure parameters were P = 470 nm, H = 35–75 nm, T = 22–81 nm and W = 60 nm. (b,c) The spectra of nanostructures with ridge height of 60 nm and metal thicknesses of 22 (b) and 62 nm (c) for different Al2O3 film thicknesses. (d) The measured surface sensitivities for different Fano factors with wavelength interrogation. (e) The intensity change against the film thickness for different aluminum nanostructures. There were linear correlations between the intensity change and the film thickness. (f) The intensity sensitivity as a function of the Fano factor. The maximum intensity sensitivity (90%/nm) was obtained when the Fano factor was close to −1.3. (g) The calculated decay lengths at peak or dip wavelength for the capped nanoslits with different Fano factors.
