Jiang Li Jia, Zhou Yun Shen, Xiong Wei, Gao Yang, Huang Xi, Jiang Lan, Baldacchini Tommaso, Silvain Jean-Francois, Lu Yong Feng
Opt Lett. 2014 May 15;39(10):3034-7. doi: 10.1364/OL.39.003034.
In this study, the degree of conversion (DC) of an acrylic-based resin (IP-L 780) in two-photon polymerization (TPP) is systematically investigated via Raman microspectroscopy. A quantitative relationship between TPP laser parameters and the DC of the resin is established. Nonlinear increase in DC with increased laser average power is observed. The resin DC is more sensitive to the laser average power than the laser writing speed. Nanoindentation was employed to correlate the results obtained from Raman microspectroscopy with the mechanical properties of microstructures fabricated by TPP. At constant writing speeds, microstructures fabricated with high laser average powers possess high hardness and high reduced Young's modulus (RYM), indicating high DCs. The results are in line with high DCs measured under the same TPP parameters in Raman microspectroscopy. Raman microspectroscopy is proved to be an effective, rapid, and nondestructive method characterizing microstructures fabrication by TPP.
在本研究中，通过拉曼显微光谱系统地研究了基于丙烯酸的树脂（IP-L 780）在双光子聚合（TPP）中的转化率（DC）。建立了TPP激光参数与树脂DC之间的定量关系。观察到DC随激光平均功率增加呈非线性增加。树脂DC对激光平均功率比激光写入速度更敏感。采用纳米压痕技术将拉曼显微光谱获得的结果与TPP制造的微结构的力学性能相关联。在恒定写入速度下，用高激光平均功率制造的微结构具有高硬度和高约化杨氏模量（RYM），表明DC较高。结果与在相同TPP参数下拉曼显微光谱测量的高DC一致。拉曼显微光谱被证明是一种表征TPP制造微结构的有效、快速且无损的方法。
