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- W3042916441 abstract "We report a study on the nonlinear optical properties of cobalt- ($mathrm{Co}$) doped $mathrm{Zn}mathrm{O}$ nanorods (NRs) using the single-beam $Z$-scan technique. In the open-aperture measurements, the undoped sample shows two-photon absorption (TPA) characteristics, whereas the doped samples exhibit a saturable absorption (SA) signature. In the closed-aperture measurements, all the samples show a self-defocusing behavior. We correlate the nonlinear absorption coefficient with the exponential reduction of the optical band gap and explain it in terms of electronic-band-structure modification because of doping. Density-functional-theory calculation is also used to understand the observed nonlinear absorption and band-gap variation. The present study can help to understand the origin of SA in $mathrm{Zn}mathrm{O}$. Doped $mathrm{Zn}mathrm{O}$ nanorods can illustrate high SA and nonlinear refraction by appropriate $mathrm{Co}$ doping, which can drive the technology for $Q$ switching and mode locking in solid-state and fiber lasers." @default.
- W3042916441 created "2020-07-23" @default.
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- W3042916441 date "2020-07-16" @default.
- W3042916441 modified "2023-10-16" @default.
- W3042916441 title "Correlation between Nonlinear Optical Properties and Electronic Band Modification in Cobalt-Doped <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mrow><mml:mi>Zn</mml:mi><mml:mi mathvariant=normal>O</mml:mi></mml:mrow></mml:math> Nanorods" @default.
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- W3042916441 doi "https://doi.org/10.1103/physrevapplied.14.014050" @default.
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