Lu Chenxu, Li Jinsong, Feng Guojin, Gao Xiumin
J Opt Soc Am A Opt Image Sci Vis. 2023 Oct 1;40(10):1861-1866. doi: 10.1364/JOSAA.500282.
This paper explored the optically induced magnetization properties of radially polarized Bessel-Gaussian vortex beams with radial phase modulation in a 4 high numerical aperture (NA) focusing system, which is based on the vector diffraction theory and the inverse Faraday effect. The results show that in the case of radial modulation parameter =0, one longitudinal magnetization chain with adjustable length can be obtained by modulating the truncation parameter . When the radial modulation parameter =1.3, two magnetization chains can be obtained by modulating the truncation parameter . By modulating the radial modulation parameter , two magnetization chains along the optical axis can be generated, each with four dark magnetic traps; meanwhile, the spacing between two magnetization chains can be adjusted. These results may be helpful in high-density all-optical magnetic recording, atom capture, and magnetic resonance microscopy.
本文基于矢量衍射理论和逆法拉第效应，研究了在数值孔径（NA）为4的高聚焦系统中，具有径向相位调制的径向偏振贝塞尔-高斯涡旋光束的光致磁化特性。结果表明，在径向调制参数=0的情况下，通过调制截断参数可获得一条长度可调的纵向磁化链。当径向调制参数=1.3时，通过调制截断参数可获得两条磁化链。通过调制径向调制参数，可沿光轴生成两条磁化链，每条磁化链有四个暗磁阱；同时，可调节两条磁化链之间的间距。这些结果可能有助于高密度全光磁记录、原子捕获和磁共振显微镜。
