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Saturable and reverse saturable absorption in aqueous silver nanoparticles at off-resonant wavelength

机译:在非共振波长下在水性银纳米颗粒中的饱和和反饱和吸收

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摘要

Silver nano-colloid was prepared by chemical reduction method and its nonlinear absorption properties were investigated by using open aperture z-scan experiment with nanosecond laser pulses operating at 532 nm. Interestingly, a switch over from saturable absorption to reverse saturable absorption was observed when the input intensity is increased from 28.1 to 175.8 MW/cm~2. The underlying mechanism responsible for the observed switching behaviour is the interplay between ground state plasmon band bleaching and excited state absorption. Theoretical fitting was done by using a model in which nonlinear absorption coefficient as well as saturation intensity are incorporated.
机译:采用化学还原法制备了纳米胶体银,并通过开孔z扫描实验和在532 nm处工作的纳秒激光脉冲研究了其非线性吸收特性。有趣的是,当输入强度从28.1增大到175.8 MW / cm〜2时,观察到了从饱和吸收到反向饱和吸收的转换。引起所观察到的转换行为的根本机制是基态等离子体激元带漂白与激发态吸收之间的相互作用。使用包含非线性吸收系数和饱和强度的模型进行理论拟合。

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