Journal: Scientific Reports

Article Title: Highly Sensitive Aluminum-Based Biosensors using Tailorable Fano Resonances in Capped Nanostructures

doi: 10.1038/srep44104

Figure Lengend Snippet: ( 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 × 10 , −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.

Article Snippet: We further utilized finite-difference time-domain (FDTD, FullWAVE 4.0, RSoft) simulations to verify the decreased decay lengths for the Fano resonance at peak and dip wavelengths. shows the calculated transmission spectra of the 470-nm-period capped aluminum nanoslits with different structure parameters for normally incident TM-polarized light.

Techniques: Transmission Assay