Strong reverse saturable absorption and negative nonlinear refractive index in NiFe<sub>2</sub>O<sub>4 </sub>nanoparticles.

ORAL

Abstract

Transition metal oxides (AB2O4) are an important class of materials due to their wide potential applications, such as energy storage, sensors, high-density magnetic recordings. We study the third-order nonlinear optical response of NiFe2O4 (NFO) by using the open and close aperture Z-scan technique to get a comprehensive study of nonlinear absorption and refraction. NFO has an indirect bandgap around 1.48eV and two direct bandgaps around 2.49eV and 3.12eV respectively. We excite the sample with a nanosecond laser at a wavelength of 532nm, and a pulse width of 7ns. We observe reverse saturable absorption as a nonlinear optical response of NFO. From the study of nanosecond excitation in NFO, we get a strong nonlinear optical response, a nonlinear absorption coefficient of around 1.3×102 cm GW-1, and a nonlinear refractive index of 3.36 × 10-4cm2 GW-1 at intensity 0.31GWcm-2The observation of the negative nonlinear refractive index reveals the occurrence of self -defocusing effect. From the strong nonlinear optical response, it is clear that NiFe2O4 can be used for optical limiting applications.

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Presenters

  • NARESH AGGARWAL

    • Department of Physics, Indian Institute of Science Education and Research, Bhopal,462066, India

Authors

  • NARESH AGGARWAL

    • Department of Physics, Indian Institute of Science Education and Research, Bhopal,462066, India

  • Pratik Shinde

    • Centre for Nano and Materials Science, Jain University, Ramanagaram, Bangalore, 562112, India

  • C. S S Rout

    • Centre for Nano and Material Science, Jain University Jain global campus, Jakkasandra, Ramanagaram, Banglore 562112 (India)
    • Centre for Nano and Materials Science, Jain University, Ramanagaram, Bangalore, 562112, India

  • K.V. V Adarsh

    • Department of Physics, Indian Institute of Science Education and Research, Bhopal 462066, India
    • Department of Physics, Indian Institute of Science Education and Research, Bhopal, 462066 India
    • Department of physics, Indian Institute of Science Education and Research Bhopal, 462066, India
    • Department of Physics, Indian Institute of Science Education and Research, Bhopal,462066, India
    • Indian Institute of Science Education and Research, Bhopal
    • Indian Institute of Science Education and Research Bhopal
    • IISER Bhopal
    • Indian Institute of Science Education and Reasearch Bhopal