Polarization dependence of the permanent deformation of silver nanoparticles in glass by ultrashort laser pulses
Polarization dependence of the permanent deformation of silver nanoparticles in glass by ultrashort laser pulses
复制标题
超短激光脉冲玻璃中银纳米颗粒永久变形的偏振依赖性
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
H. Graener
中科院分区：
文献类型：
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作者：
M. Kaempfe;G. Seifert;K. Berg;H. Hofmeister;H. Graener
摘要：用波长与粒子表面等离子体共振相对应的单次强超短激光脉冲照射含球形纳米银的玻璃。经线偏振照射后，观察到二色性。透射电镜研究表明，这些光谱变化是由于粒子的各向异性（在透射电镜投影中近似椭球）变形引起的，在中心的周围有一个额外的小银粒子晕。变形后的粒子取向均匀，长轴垂直于激光偏振方向。使用圆偏振激光脉冲，粒子周围再次形成光晕，但中心粒子保持球形，在光谱中没有观察到二色性。
Abstract:Glass containing spherical silver nanoparticles has been irradiated with single, intense, ultrashort laser pulses, with a wavelength corresponding to the surface plasmon resonance of the particles. After irradiation with linear polarization, dichroism is observed. Transmission electron microscopy studies reveal that these spectral changes are caused by deformation of the particles to anisotropic (in the TEM projection approximately ellipsoidal) shapes with an additional halo of small silver particles around the central one. The deformed particles are uniformly oriented with their longer axes perpendicular to the laser polarization. Using laser pulses with circular polarization, again a halo is formed around the particles, but the central particles remain spherical, and no dichroism was observed in the optical spectra.