Effects of thermal treatment on femtosecond laser fabricated diffraction gratings in polystyrene
Effects of thermal treatment on femtosecond laser fabricated diffraction gratings in polystyrene
复制标题
热处理对飞秒激光制造的聚苯乙烯衍射光栅的影响
DOI：
10.1016/j.apsusc.2011.05.019
复制
发表时间：
2011
影响因子：
6.7
通讯作者：
D. N. Rao
中科院分区：
文献类型：
--
作者：
K. Deepak;Venugopal Rao Soma;D. N. Rao
我们报道了利用飞秒激光直写技术在聚苯乙烯块体材料中制作高效的掩埋衍射光栅和微坑。在1μJ能量、1 mm/s速度、30μm周期条件下制作的掩埋光栅，衍射效率最高可达10%。在低能量和高扫描速度下，获得了典型尺寸为0.22 μm的掩埋微坑。从场发射扫描电子显微镜的研究，观察到的发射归因于由于内表面改性和周围的空隙的碎片解决。对制作的光栅进行了热处理，测试了光栅在不同激发波长下的衍射效率和发射，并给出了观察结果。从飞秒激光改性区域收集的拉曼光谱揭示了与入射高斯激光脉冲相关的高峰强度的少数拉曼模式的消失。这些发光微坑的潜在应用突出。
We report the fabrication of efficient, buried diffraction gratings and micro-craters in bulk polystyrene using femtosecond laser direct writing technique. We recorded a maximum diffraction efficiency of 10% for a buried grating fabricated at 1μJ energy, 1mm/s speed, and a period of 30μm. Buried micro-craters, with typical dimensions of ∼2μm, were achieved at low energies and high scanning speeds. From the field emission scanning electron microscope studies, the observed emission is attributed as due to the inner surface modifications and the debris settled around the voids. The fabricated gratings subjected to heat treatment were tested for the diffraction efficiency and emission at different excitation wavelengths and the observed results are presented. Raman spectra collected from the femtosecond laser modified regions revealed the disappearance of few Raman modes at high peak intensities associated with incident Gaussian laser pulse. Potential applications of these luminescent micro-craters are highlighted.