Nie Zhong-Quan, Lin Han, Liu Xiao-Fei, Zhai Ai-Ping, Tian Yan-Ting, Wang Wen-Jie, Li Dong-Yu, Ding Wei-Qiang, Zhang Xue-Ru, Song Ying-Lin, Jia Bao-Hua
Key Lab of Advanced Transducers and Intelligent Control Systems, Ministry of Education of Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China.
Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
Light Sci Appl. 2017 Aug 25;6(8):e17032. doi: 10.1038/lsa.2017.32. eCollection 2017 Aug.
We demonstrate an all-optical strategy for realizing spherical three-dimensional (3D) super-resolution (∼/22) spot arrays of pure longitudinal magnetization by exploiting a 4 optical microscopic setup with two high numerical aperture (NA) objective lenses, which focus and interfere two modulated vectorial beams. Multiple phase filters (MPFs) are designed via an analytical approach derived from the vectorial Debye diffraction theory to modulate the two circularly polarized beams. The system is tailored to constructively interfere the longitudinal magnetization components, while simultaneously destructively interfering the azimuthal ones. As a result, the magnetization field is not only purely longitudinal but also super-resolved in all three dimensions. Furthermore, the MPFs can be designed analytically to control the number and locations of the super-resolved magnetization spots to produce both uniform and nonuniform arrays in a 3D volume. Thus, an all-optical control of all the properties of light-induced magnetization spot arrays has been demonstrated for the first time. These results open up broad applications in magnetic-optical devices such as confocal and multifocal magnetic resonance microscopy, 3D ultrahigh-density magneto-optic memory, and light-induced magneto-lithography.
我们展示了一种全光策略，通过利用一种包含两个高数值孔径（NA）物镜的光学显微镜设置来实现纯纵向磁化的球形三维（3D）超分辨率（约λ/22）光斑阵列，该设置聚焦并干涉两束调制的矢量光束。通过从矢量德拜衍射理论推导的解析方法设计多个相位滤波器（MPF），以调制两束圆偏振光束。该系统经过定制，使纵向磁化分量相长干涉，同时使方位角分量相消干涉。结果，磁化场不仅是纯纵向的，而且在所有三个维度上都实现了超分辨率。此外，可以通过解析设计MPF来控制超分辨磁化光斑的数量和位置，以在3D体积中产生均匀和非均匀阵列。因此，首次展示了对光致磁化光斑阵列所有特性的全光控制。这些结果为共聚焦和多焦点磁共振显微镜、3D超高密度磁光存储器和光致磁光刻等磁光器件开辟了广泛的应用前景。
