Absorption spectra of bulk glass showing band edge extends up to NIR region. (b) Absorption spectra of nanocolloidal solutions of various concentrations.
Photograph of C1, C2, C3, C4, and C5 nanocolloids showing quantum size effect.
Molecular energy states of Ge-Ge and Se-Se bonds and corresponding broadened energy bands in their solid form.
(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.
Variation of radial phase shift (Δφ0) with respect to the change in bandgaps. Solid curve shows quadratic polynomial fit.
Variation of nonlinear optical coefficients with respect to bandgap.
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