Linear and third-order nonlinear optical absorption of amorphous Ge nanoclusters embedded in Al[sub 2]O[sub 3] matrix synthesized by electron-beam coevaporation

Wan, Q.; Lin, C. L.; Zhang, N. L.; Liu, W. L.; Yang, G.; Wang, T. H.
May 2003
Applied Physics Letters;5/12/2003, Vol. 82 Issue 19, p3162
Academic Journal
Amorphous germanium (α-Ge) nanoclusters embedded in Al[SUB2]O[SUB3] matrix are synthesized on fused-quartz glass substrate at room temperature by vacuum electron-beam coevaporation. Linear optical transmittance measurements reveal an indirect optical absorption edge with a blueshift as large as 1.6 eV due to the quantum confinement effects. The Z-scan method is used to study the third-order nonlinear absorption process of the synthesized samples, which clearly show a two-photon nonlinear process. Results also suggest that Ge nanocluster density or size is of great influence to the value of nonlinear absorption coefficient β.


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