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Nonlinear reflectance as a function of incident radiation intensity of a nonlinear nanodipole array with SiO2 thicknesses 100 nm (black line) and 180 nm (red line) and at wavelengths: (a) 710 nm, (b) 730 nm, and (c) 770 nm. Optical bistability is obtained due to the nonlinear Kerr effect of polystyrene which is loaded at the nanogap of each nanodipole .
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