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Nonlinear absorption, scattering and optical limiting studies of CdS nanoparticles

N. Venkatram, D. Narayana Rao, and M. A. Akundi

Open Access Open Access

Abstract

The nonlinear optical absorption, scattering and optical limiting properties of CdS nanoparticles dispersed in dimethylformamide (DMF) are investigated. The nanoparticles are synthesized using the standard chemical synthesis method with thioglycerol as the capping agent. The investigations are carried out at 532 nm in the ns regime. Strong two-photon absorption and nonlinear scattering are found to be responsible for good optical limiting characteristics in these nanoparticles.

©2005 Optical Society of America

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Figures (7)
Fig. 1.
Fig. 1. Schematic of the Z scan set up for recording the nonlinear absorption and scattering. A-aperture, S-sample, F1, F2, F3, F4-Neutral Density Filters, D1, D2, D3-Detectors, BS-Beam splitter, L1, L2, L3, L4-lens.

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Fig. 2.
Fig. 2. UV-Vis absorption of 4.5 nm size of CdS nanoparticles in DMF.

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Fig. 3.
Fig. 3. XRD of 4.5 nm CdS nanoparticles powder on glass plate.

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Fig. 4.
Fig. 4. TEM image of 4.5 nm CdS nanoparticles.

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Fig. 5.
Fig. 5. Open aperture Z-Scan (Detector 2) of 4.5 nm CdS nanoparticles in DMF and its theoretical fits (solid line) at two different intensities and at a concentration of CdS: DMF=1:100

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Fig. 6.
Fig. 6. Scattering of 4.5 nm CdS nanoparticles at three different angles with intensity (Z-position).

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Fig. 7.
Fig. 7. Transmitted light and scattering (Detector1), transmitted light minus scattering (Detector2) of 4.5 nm CdS nanoparticles with respect to input fluence. Dashed line represents linear transmittance of 0.76 at 532 nm and the solid line is the curve obtained by integrating the equation 3.

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Equations (3)

Equations on this page are rendered with MathJax. Learn more.

d N 0 dt = − β I 2 2 ℏ ω + N 1 τ 1
dN 1 dt = β I 2 2 ℏ ω − N 1 τ 1
dI dz = − α s I − β I 2
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