Abstract
Low scattering and deep penetration of infrared light in colloidal materials are critical in many biomedical applications. CuxS nanoparticles (NPs) play an important role on this due to their localized surface plasmonic resonant (LSPR) wavelength located at near infrared (NIR) range. In this work, tunable nonlinear responses of CuxS NP suspensions are investigated by analyzing self-focusing propagation of infrared light. CuxS NPs are firstly synthesized by hot-injection method with stoichiometric ratio controlled in range of 1.01 ≤ x ≤ 1.91, realizing an appropriate free hole densities for tuning their LSPR absorption wavelengths from 1170 nm to 1640 nm. Then, by changing concentration and stoichiometric ratio to adjust the polarizability, tunable nonlinear self-focusing effects of NIR light in various CuxS NP/chloroform suspensions are observed, which are induced by optical nonlinearity of these CuxS NPs. Particularly, a larger concentration and a lower stoichiometric ratio lead to a stronger nonlinearity, which results from the optical force-mediated dynamics and the LSPR absorption interactions. Our results not only provide new candidates for realizing LSPR nonlinearities and curious nonlinear optical phenomena, but also imply new possible tantalizing biomedical applications of CuxS NPs such as biomedical imaging and medical diagnosis or therapy.
Published Version
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