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Title: Nonlinear optical effects in CdS and Au: CdS nanocomposite
Keywords: Pump-probe, Two-Photon Absorption, CdS, Photonic Crystals, Photonic Band gap, Matrix-Transfer Method
Issue Date: 22-Jan-2006
Citation: RAJIV KASHYAP (2006-01-22). Nonlinear optical effects in CdS and Au: CdS nanocomposite. ScholarBank@NUS Repository.
Abstract: We investigated the Au: CdS nanocomposite film using femtosecond pump-probe measurement at 800 nm and studied the excited state dynamics of Au: CdS nanocomposite film. The time dependence of transmittance shows enhanced two-photon absorption of CdS particles, followed by a saturable absorption and a 3.2 ps recovery process which clearly demonstrates that resonant energy transfer between CdS and Au nanocomposite systems occur with excitation at 800 nm . In addition, two-photon absorption (TPA) enhancement of CdS nanoparticles was as large as nearly 6-fold compared to that of bulk CdS. We also performed a systematic study by femtosecond pump-probe experiment on TPA coefficients in several One-Dimensional Photonic Crystals (1D PC) samples, where each of them contains a CdS layer with a nearly fixed resonant defect mode at 800 nm. The results show that the enhancement of TPA coefficient of the CdS layer is governed basically by the number of periods (NOP) and the mid-gap position of Photonic Band Gap (PBG) in the 1D PCs. All the results agree qualitatively with the expectations of matrix transfer formulation.
Appears in Collections:Master's Theses (Open)

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