Fig. 3: Analysis of detection limit.
From: 1/f-noise-free optical sensing with an integrated heterodyne interferometer
a–c Histograms of normalized beat intensity change δIbeat for standard polystyrene nanobeads with radii of 30 nm (a), 41 nm (b), and 55 nm (c). d Normalized δIbeat induced by standard polystyrene nanobeads versus radius. Blue dots are the scattering efficiencies of the nanoparticle obtained by 3D FEM simulation. The fitting curve shows a2.85 dependence. The dashed lines are the noise levels for Δf = 0 and 30 kHz, respectively. Error bars represent the standard deviation.
