All-optical helicity-dependent magnetic switching by first-order azimuthally polarized vortex beams
All-optical helicity-dependent magnetic switching by first-order azimuthally polarized vortex beams
复制标题
一阶方位角偏振涡旋光束的全光螺旋度相关磁开关
DOI：
10.1063/1.5051576
复制
发表时间：
2018-10-22
影响因子：
4
通讯作者：
Li, Xiangping
中科院分区：
文献类型：
--
作者：
Wang, Sicong;Wei, Chen;Li, Xiangping
本文提出了一种利用一阶方位偏振涡旋（FAPV）光束实现全光螺旋度相关磁开关的方法。对FAPV光束焦场的数值计算表明，由于偏振奇异性与螺旋波阵面的相互作用，产生了左旋和右旋圆偏振。在低数值孔径（NA）条件下和窄注量窗口内，对Gd_（27）Fe_（63.87）Co_（9.13）进行了AO-HDS实验研究。数值预测表明，在高数值孔径条件下，FAPV光束记录的磁比特横向尺寸可以比圆偏振光束小近30%，这为实现超快、超高密度磁记录开辟了一条有希望的途径。提出了一种利用一阶方位偏振涡旋（FAPV）光束实现全光螺旋度相关磁开关（AO-HDS）的方法。对FAPV光束焦场的数值计算表明，由于偏振奇异性与螺旋波阵面的相互作用，产生了左旋和右旋圆偏振。在低数值孔径（NA）条件下和窄注量窗口内，对Gd_（27）Fe_（63.87）Co_（9.13）进行了AO-HDS实验研究。数值预测表明，在高数值孔径条件下，FAPV光束记录的磁比特横向尺寸比圆偏振光束记录的磁比特横向尺寸小近30%，为实现超快、超高密度磁记录开辟了一条有希望的途径。
In this letter, a method to realize all-optical helicity-dependent magnetic switching (AO-HDS) using a first-order azimuthally polarized vortex (FAPV) beam is demonstrated. Numerical calculations of the focal fields of FAPV beams reveal that left-handed and right-handed circular polarizations are generated due to the interaction between the polarization singularity and the helical wave front. Its feasibility for AO-HDS is experimentally demonstrated in Gd27Fe63.87Co9.13 under low numerical aperture (NA) conditions and within a narrow fluence window. It is numerically predicted that under high NA conditions, the lateral size of magnetic bits recorded by FAPV beams can be nearly 30% smaller than that obtained by circularly polarized beams, which opens a promising route to realize ultrafast and ultrahigh-density magnetic recording.In this letter, a method to realize all-optical helicity-dependent magnetic switching (AO-HDS) using a first-order azimuthally polarized vortex (FAPV) beam is demonstrated. Numerical calculations of the focal fields of FAPV beams reveal that left-handed and right-handed circular polarizations are generated due to the interaction between the polarization singularity and the helical wave front. Its feasibility for AO-HDS is experimentally demonstrated in Gd27Fe63.87Co9.13 under low numerical aperture (NA) conditions and within a narrow fluence window. It is numerically predicted that under high NA conditions, the lateral size of magnetic bits recorded by FAPV beams can be nearly 30% smaller than that obtained by circularly polarized beams, which opens a promising route to realize ultrafast and ultrahigh-density magnetic recording.