Figure 3
Surface sensitivity tests of 900-nm-period Ti/Ag capped nanoslits for different incident angles with wavelength interrogation by measuring BSA/anti-BSA interactions. Measured transmission spectra of the 1st order resonance mode of the capped nanoslits with a 10-nm-thick titanium and 60-nm-thick silver film at incidence angles of (a) 0° and (b) 35° in air, BSA (1 mg/mL) and anti-BSA (25 μg/mL). (c) Resonance wavelengths as a function of the incident angle in different surface conditions. The insets show the spectral shifts as a function of the incident angle. (d) Normalized spectral shift as a function of the resonance wavelength.
