Self-organized nanogratings in glass irradiated by ultrashort light pulses
Self-organized nanogratings in glass irradiated by ultrashort light pulses
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DOI：
10.1103/physrevlett.91.247405
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发表时间：
2003-12-12
影响因子：
8.6
通讯作者：
Hirao, K
中科院分区：
文献类型：
--
作者：
Shimotsuma, Y;Kazansky, PG;Hirao, K
周期性的纳米结构内观察到的飞秒钛：蓝宝石激光器的聚焦光束照射后的石英玻璃。背散射电子图像的照射点揭示了一个周期性结构的带状区域的宽度类似于20 nm的低氧浓度，这是垂直于激光偏振方向排列。这是有史以来由光创造的最小的嵌入式结构。自组织光栅结构的周期可以通过脉冲能量和辐照脉冲数控制在140 ~ 320 nm之间。这一现象被解释为入射光场和体电子等离子体波的电场之间的干涉，导致电子等离子体浓度的周期性调制和玻璃中的结构变化。
Periodic nanostructures are observed inside silica glass after irradiation by a focused beam of a femtosecond Ti:sapphire laser. Backscattering electron images of the irradiated spot reveal a periodic structure of stripelike regions of similar to20 nm width with a low oxygen concentration, which are aligned perpendicular to the laser polarization direction. These are the smallest embedded structures ever created by light. The period of self-organized grating structures can be controlled from similar to140 to 320 nm by the pulse energy and the number of irradiated pulses. The phenomenon is interpreted in terms of interference between the incident light field and the electric field of the bulk electron plasma wave, resulting in the periodic modulation of electron plasma concentration and the structural changes in glass.