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Nonlinear absorption and scattering properties of cadmium sulphide nanocrystals with its application as a potential optical limiter
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10.1063/1.2354417
/content/aip/journal/jap/100/7/10.1063/1.2354417
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/7/10.1063/1.2354417

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the -scan setup for recording the nonlinear absorption and scattering. A—aperture; S—sample; F1, F2, F3, and F4—Neutral density filters, D1, D2, and D3—detectors; BS—beam splitter; L1, L2, L3, and L4—lens.

Image of FIG. 2.
FIG. 2.

UV-Vis absorption spectra of CdS nanocrystals.

Image of FIG. 3.
FIG. 3.

XRD spectra of CdS nanocrystals.

Image of FIG. 4.
FIG. 4.

(a) TEM picture of CdS nanocrystals. (b) HRTEM picture of CdS nanocrystals showing crystalline structure and diffraction pattern (inside picture).

Image of FIG. 5.
FIG. 5.

Fluorescence and upconverted fluorescence spectra of the CdS nanocrystals.

Image of FIG. 6.
FIG. 6.

(a) Open aperture -scan curves of the CdS nanocrystals collected with two detectors; detector 1 gives the transmitted light and scattering, and detector 2 gives the transmitted light without scattering with laser pulses. (b) Open aperture -scan curve of the CdS nanoparticles with laser pulses, and the solid line is the curve obtained by theoretical fitting.

Image of FIG. 7.
FIG. 7.

(a). Scattering of CdS nanocrystals at three different forward angles with intensity (-position). (b) Snapshot of the transmitted beam showing the distribution of the scattering in transmitted light through the CdS nanocrystals.

Image of FIG. 8.
FIG. 8.

Change in two-photon absorption coefficient with respect to concentration of CdS nanocrystals. , as estimated from the -scan data recorded with a nanosecond laser of pure DMF solvent is .

Image of FIG. 9.
FIG. 9.

Log-log plot of the phase conjugate signal as a function of the intensity, CdS curve having a slope of and curve having a slope of .

Image of FIG. 10.
FIG. 10.

Change in thermal nonlinear refractive index with respect to concentration of CdS nanocrystals.

Image of FIG. 11.
FIG. 11.

Change in effective scattering coefficient with respect to concentration of CdS nanocrystals at two different intensities. The solid line is the curve obtained by fitting Eq. (7).

Image of FIG. 12.
FIG. 12.

Transmitted light and scattering (detector 1) and transmitted light without scattering (detector 2) of CdS nanocrystals with respect to input fluence. Dashed line represents linear transmittance of 0.76 at and the solid line is the curve obtained by integrating Eq. (3).

Image of FIG. 13.
FIG. 13.

Optical limiting threshold of CdS nanocrystals with respect to concentration, collected with detector 2.

Image of FIG. 14.
FIG. 14.

Snapshot of circular optical fringes formed in the transverse plane to the beam propagation direction at high intensity.

Tables

Generic image for table
Table I.

Two-photon absorption coefficient , nonlinear scattering coefficient , scattering parameter , thermal nonlinear refractive index , and limiting threshold of CdS nanocrystals at different concentrations (at wavelength).

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/content/aip/journal/jap/100/7/10.1063/1.2354417
2006-10-09
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nonlinear absorption and scattering properties of cadmium sulphide nanocrystals with its application as a potential optical limiter
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/7/10.1063/1.2354417
10.1063/1.2354417
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