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Concentration tuned bandgap and corresponding nonlinear refractive index dispersion in Ga-Ge-Se nanocolloids
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10.1063/1.4817176
/content/aip/journal/jap/114/5/10.1063/1.4817176
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/5/10.1063/1.4817176

Figures

Image of FIG. 1.
FIG. 1.

Absorption spectra of bulk glass showing band edge extends up to NIR region. (b) Absorption spectra of nanocolloidal solutions of various concentrations.

Image of FIG. 2.
FIG. 2.

Photograph of C1, C2, C3, C4, and C5 nanocolloids showing quantum size effect.

Image of FIG. 3.
FIG. 3.

Molecular energy states of Ge-Ge and Se-Se bonds and corresponding broadened energy bands in their solid form.

Image of FIG. 4.
FIG. 4.

(a) Nonlinear absorption of C1, C2, and C3 nanocolloids. Samples C4 and C5 show little nonlinear absorption and are not included. (b) Closed aperture Z-scan trace of C1, C2, C3, C4, and C5 concentrations at an aperture size S = 0.3 shows a bandgap dependent reduction in negative nonlinear refraction.

Image of FIG. 5.
FIG. 5.

Variation of radial phase shift (Δφ) with respect to the change in bandgaps. Solid curve shows quadratic polynomial fit.

Tables

Generic image for table
Table I.

Variation of nonlinear optical coefficients with respect to bandgap.

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/content/aip/journal/jap/114/5/10.1063/1.4817176
2013-08-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Concentration tuned bandgap and corresponding nonlinear refractive index dispersion in Ga-Ge-Se nanocolloids
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/5/10.1063/1.4817176
10.1063/1.4817176
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