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首页> 外文会议>Ultrafast Phenomena in Semiconductors and Nanostructure Materials X >Ultrafast Deformation Dynamics of Silver Nanoparticles in Glass Induced by Femtosecond Laser Pulses
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Ultrafast Deformation Dynamics of Silver Nanoparticles in Glass Induced by Femtosecond Laser Pulses

机译：飞秒激光脉冲诱导玻璃中银纳米粒子的超快变形动力学

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摘要

Glass containing spherical silver nanoparticles shows a strong extinction band in the visible range due to the surface plasmon resonance (SPR) of the particles. Irradiating this material with intense, ultrashort laser pulses with a wavelength close to the SPR leads to permanent changes of its optical properties. In particular, using linearly polarized pulses, we observed strong dichroism; the latter is nanoscopically caused by deformation of the particles to ellipsoidal shapes with an additional halo of small silver particles around the central one, with a preferential orientation. In case of a single laser shot of sufficient intensity this orientation is orthogonal to the laser polarization, whereas multi-shot irradiation usually causes preferential orientation along the laser polarization. This effect is quite useful for the production of dichroitic or polarizing microstructures, and optical elements or optoelectronic devices. In this paper we describe the results of a variety of experimental studies (mostly femtosecond laser pump-probe, electron microscopy, photoluminescence) on the understanding of the physical processes, which show clearly that ultrafast ejection of electron and silver ions into the glass matrix is the starting mechanism, whereas in the course of deformation diffusion processes controlled by the local temperature play a decisive role for the final particle shapes (and thus the optical properties after laser treatment).
机译：包含球形银纳米粒子的玻璃由于粒子的表面等离振子共振（SPR）而在可见光范围内显示出很强的消光带。用波长接近SPR的强烈，超短激光脉冲辐照此材料，会导致其光学性能发生永久性变化。特别是，使用线性极化脉冲，我们观察到了强烈的二向色性。后者是在纳米级上由颗粒变形为椭圆形而形成的，在中心有一个围绕着一个优先方向的小银颗粒。在单个激光束具有足够强度的情况下，该方向与激光偏振正交，而多次照射通常会导致沿激光偏振的优先取向。该效果对于二色性或偏振性微结构，光学元件或光电器件的生产非常有用。在本文中，我们基于对物理过程的理解，描述了各种实验研究的结果（主要是飞秒激光泵浦探针，电子显微镜，光致发光），这些研究清楚地表明，电子和银离子超快喷射到玻璃基质中是然而，在变形过程中，受局部温度控制的扩散过程对于最终的颗粒形状（以及激光处理后的光学性能）起着决定性的作用。

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