Abstract

Recently, titanium-based nanostructures with high nonlinear optical properties have found use in ultrafast photonic system applications. Here, we report a study of the third-order nonlinear optical property of the ${{\rm CuCo}_{0.5}}{{\rm Ti}_{0.5}}{{\rm O}_2}$ (CCoTO) nanostructure synthesized via a simple chemical route. The 40–70 nm CCoTO nanoparticles with centrosymmetric crystalline structure show strong absorption in the 325–850 nm wavelength range due to the presence of different crystalline phases and surface vacancies. A Z-scan technique is used to study the electronic third-order nonlinearity of the synthesized nanoparticles, where a low-repetition-rate 120 fs laser source is employed to minimize thermal agitation-related nonlinearity. The CCoTO nanoparticles possess high surface defects due to oxygen- and copper-related vacancies, which are able to enhance the exciton oscillator strength resulting from the high value of third-order optical nonlinearity. The estimated values of nonlinear refractive index (${n_2}$) and nonlinear absorption coefficient ($\beta $) of the CCoTO are $ - {1.24}\; \times \;{{10}^{ - 15}}$ and ${3.79} \times {{10}^{ - 11}}$, respectively, under ${188}\,\,{{\rm GW/cm}^2}$ incident intensity. The intensity-dependent nonlinear optical property of the synthesized nanoparticles is also studied under different incident laser irradiation (62.7, 93, and ${188}\,\,{{\rm GW/cm}^2}$). In the two-photon absorption (TPA)-dominated third-order nonlinear optical process, the values of ${n_2}$ and $\beta $ of CCoTO are increased with intensifying the incident laser irradiation. The obtained high value of third-order optical nonlinearity of the synthesized nanostructure can be exploited in optical power limiters, pulse power reshaping, and optical switching applications.

© 2019 Optical Society of America

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