Spatial Control of Urea Crystal Growth by Focused Femtosecond Laser Irradiation
Spatial Control of Urea Crystal Growth by Focused Femtosecond Laser Irradiation
复制标题
DOI：
10.1021/cg050190v
复制
发表时间：
2006
影响因子：
3.8
通讯作者：
H. Yoshikawa;Y. Hosokawa;H. Masuhara
中科院分区：
文献类型：
--
作者：
H. Yoshikawa;Y. Hosokawa;H. Masuhara
利用飞秒激光脉冲在尿素过饱和溶液中对尿素晶体的生长进行了空间控制。当波长为800或1470 nm的飞秒激光脉冲通过物镜透镜照射针状尿素晶体时，新的针状晶体从激光焦斑（约微米尺寸）生长。随着激光能量的增加，激光诱导后续晶体的数量增加。然而，这样的晶体生长不能诱导由1480 nm连续波（CW）激光照射。通过应用这种新现象，成功地证明了晶体的图案化。最后，从光机械效应导致晶体破碎的角度讨论了飞秒激光诱导晶化的机理。
Growth of urea crystals in a supersaturated solution of urea was spatially controlled by irradiation with a femtosecond laser pulse. When a needlelike urea crystal was irradiated by a single femtosecond laser pulse with wavelength of 800 or 1470 nm through an objective lens, a new needlelike crystal grew from the laser focal spot (approximately micrometer sized). The number of the laser-induced subsequent crystals increased with laser energy. However, such crystal growth could not be induced by 1480 nm continuous wave (CW) laser irradiation. By application of the new phenomenon, patterning of the crystals was successfully demonstrated. Finally, the mechanism of the femtosecond laser-induced crystallization was discussed in terms of the crystal fragmentation caused by photomechanical effect.