Fig. 3: Nanohole array for biosensing application.
From: Dielectric nanohole array metasurface for high-resolution near-field sensing and imaging
a Schematic of the optical system with a nanohole array as sensor and a second microfluidic channel included for reference. The inset shows a schematic of the operation principle of a chirped nanohole array with a shift of the resonance position due to a change of the effective index for protein binding. b Camera image of 2 chirped nanohole arrays in the reference and signal channels for an input wavelength of λ = 667 nm. The shift Δ of the resonance position occurs after IgG binding. The inset shows the Fano fit (red curve) of the resonance curve.
