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Nonlinear optical properties of free standing films of PbS quantum dots in the nonresonant femtosecond regime

机译：非共振飞秒状态下PbS量子点的自立膜的非线性光学性质

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Devices based on optical technology for high speed communication networks require materials with large nonlinear optical response in the ultrafast regime. Nonlinear optical materials have also attracted wide attention as potential candidates for the protection of optical sensors and eyes while handling lasers. Optical limiters have a constant transmittance at low input influence and a decrease in transmittance at higher fluences and are based on a variety of mechanisms such as nonlinear refraction, nonlinear scattering, multiphoton absorption and free carrier absorption. As we go from bulk to nanosized materials especially in the strong quantum confinement regime where radius of the nanoparticle is less than the bulk exciton Bohr radius, the optical nonlinearity is enhanced due to quantum confinement effect. This paper is on the ultrafast nonresonant nonlinearity in free standing films of PbS quantum dots stabilized in a synthetic glue matrix by a simple chemical route which provides flexibility of processing in a variety of physical forms. Optical absorption spectrum shows significant blue shift from the bulk absorption onset indicating strong quantum confinement. PbS quantumdots of mean size 3.3nm are characterized by X-ray diffraction and transmission electron microscopy. The mechanism of nonlinear absorption giving rise to optical limiting is probed using open z-scan technique with laser pulses of 150 fs pulse duration at 780 nm and the results are presented in the nonresonant femtosecond regime. Irradiance dependence on nonlinear absorption are discussed.
机译：用于高速通信网络的基于光学技术的设备需要在超快状态下具有较大非线性光学响应的​​材料。非线性光学材料作为处理激光时保护光学传感器和眼睛的潜在候选物也引起了广泛关注。光学限幅器在低输入影响下具有恒定的透射率，而在高通量下具有透射率的降低，并且基于多种机制，例如非线性折射，非线性散射，多光子吸收和自由载流子吸收。随着我们从块状材料到纳米尺寸材料的发展，特别是在强量子限制机制中，纳米粒子的半径小于块状激子玻尔半径，由于量子限制效应，光学非线性得到了增强。本文是关于通过简单的化学途径稳定在合成胶基质中的PbS量子点的独立膜中的超快非共振非线性，该途径提供了多种物理形式的加工灵活性。光学吸收光谱从本体吸收开始显示出明显的蓝移，表明强烈的量子限制。通过X射线衍射和透射电子显微镜表征平均尺寸为3.3nm的PbS量子点。使用开放z扫描技术探测了在780 nm处具有150 fs脉冲持续时间的激光脉冲的非线性吸收引起光学限制的机理，并在非共振飞秒范围内给出了结果。讨论了辐照度对非线性吸收的依赖性。

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