Porfirev Alexey, Khonina Svetlana, Porfirev Denis, Ivliev Nikolay
Opt Lett. 2025 Jan 1;50(1):161-164. doi: 10.1364/OL.543579.
Taking into account phase-polarization interactions is crucial for the formation of spatially structured laser beams. The effects that arise in this context can lead to the modulation of individual field components and the transformation of the overall light field. In this study, we investigate the impact of phase and polarization distributions with radial dependencies in polar coordinates on the longitudinal component of laser beams passing through a transmissive spatial light modulator (SLM) based on twisted nematic liquid crystals. Although the amplitude, phase, and polarization distribution of the transformed light field behind the SLM do not depend on the azimuthal angle, the structure of the longitudinal component of the field exhibits a spiral shape. By utilizing the shaped light fields and a projection lithography technique, we demonstrate the feasibility of fabricating spiral microaxicons in thin films of polarization-sensitive materials. We also show that the direction of the spiral twist and the period of the microaxicon can be controlled by manipulating the parameters of the masks displayed on the SLM. Furthermore, we demonstrate the potential for the parallel fabrication of arrays of such microelements. The results obtained show that precise laser processing of photosensitive materials requires taking into account possible phase-polarization interactions of the illuminating laser radiation.
考虑相位 - 偏振相互作用对于空间结构化激光束的形成至关重要。在此背景下产生的效应可导致单个场分量的调制以及整个光场的变换。在本研究中，我们研究了在极坐标系中具有径向依赖性的相位和偏振分布对通过基于扭曲向列型液晶的透射式空间光调制器（SLM）的激光束纵向分量的影响。尽管SLM后面变换后的光场的幅度、相位和偏振分布不依赖于方位角，但场的纵向分量结构呈现出螺旋形状。通过利用成形光场和投影光刻技术，我们证明了在偏振敏感材料薄膜中制造螺旋微轴锥镜的可行性。我们还表明，通过操纵SLM上显示的掩模参数，可以控制螺旋扭曲方向和微轴锥镜的周期。此外，我们展示了并行制造此类微元件阵列的潜力。所获得的结果表明，对光敏材料进行精确的激光加工需要考虑照明激光辐射可能的相位 - 偏振相互作用。
