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|Title:||Nonlinear optical response of Ge nanocrystals in silica matrix with excitation of femtosecond pulses||Authors:||Li, H.P.
|Issue Date:||2001||Citation:||Li, H.P.,Kam, C.H.,Lam, Y.L.,Jie, Y.X.,Ji, W.,Wee, A.T.S.,Huan, C.H.A. (2001). Nonlinear optical response of Ge nanocrystals in silica matrix with excitation of femtosecond pulses. Applied Physics B: Lasers and Optics 72 (5) : 611-615. ScholarBank@NUS Repository.||Abstract:||We report an investigation of third-order optical nonlinearities in Ge nanocrystals (∼ 6 nm radius) embedded in silica matrix using the Z-scan and pump-probe techniques with femtosecond laser pulses at 780-nm wavelength. The nanocrystallite Ge samples were prepared using magnetron co-sputtering and post-thermal annealing at 800°C. The nonlinear absorption coefficient and refractive index of the Ge nanocrystals were determined to be in the range from 1.8 × 10-7 to 6.8 × 10-7cm/W and 1.5 × 10-12 to 8.0 × 10-12 cm2/W, respectively, which are proportional to the Ge atomic fraction in the matrix. Relaxation of the non-linear response was found to have two characteristic time constants, 1.8 ps and 65 ps. The mechanisms responsible for the observed nonlinear response are discussed.||Source Title:||Applied Physics B: Lasers and Optics||URI:||http://scholarbank.nus.edu.sg/handle/10635/97346||ISSN:||09462171|
|Appears in Collections:||Staff Publications|
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