Abstract
ABSTRACT We investigate the effect of nanoparticles’ diameter and concentration on the nonlinear absorption/refractive index in non-metallic nanosuspensions remarking that the results are in contrast to the colloidal metal nanoparticles. We then consider the nanosuspension as a saturable absorptive medium. Assuming a simple solution for Haus equation, we investigate the effect of diameter on optical pulse width and minimum energy required for pulse formation. We indicate that the pulse width will decrease for non-metallic nanosuspension if the diameter decreases while the pulse width will increase for metal nanoparticles conversely due to appearing the Local Field Enhancement (LFE). However, we show that the minimum-required energy is minimised for a certain value of nanoparticles’ diameter in both metal and non-metallic nanosuspensions. The potency of modulating the nonlinearity and the subsequent pulse-shaping feature presented in this study can be grounded for designing the novel all-optical/electro-optical components using the colloidal nanoparticles.
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