Turquet Léo, Kakko Joona-Pekko, Jiang Hua, Isotalo Tero J, Huhtio Teppo, Niemi Tapio, Kauppinen Esko, Lipsanen Harri, Kauranen Martti, Bautista Godofredo
Opt Express. 2017 May 1;25(9):10441-10448. doi: 10.1364/OE.25.010441.
We demonstrate nonlinear microscopy of oriented nanowires using excitation beams with binary phase modulation. A simple and intuitive optical scheme comprising a spatial light modulator gives us the possibility to control the phase across an incident Hermite-Gaussian beam of order (1,0) (HG mode). This technique allows us to gradually vary the spatial distribution of the longitudinal electric fields in the focal volume, as demonstrated by second-harmonic generation from vertically-aligned GaAs nanowires. These results open new opportunities for the full control of polarization in the focal volume to enhance light interaction with nanostructured materials.
我们展示了使用具有二元相位调制的激发光束对取向纳米线进行非线性显微镜成像。一种包含空间光调制器的简单直观光学方案使我们能够控制入射的（1,0）阶厄米-高斯光束（HG模式）的相位。如垂直排列的GaAs纳米线的二次谐波产生所示，该技术使我们能够逐渐改变焦区内纵向电场的空间分布。这些结果为全面控制焦区内的偏振以增强光与纳米结构材料的相互作用开辟了新机会。
