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基于空间光调制器的瓣状结构光生成及应用

Generation and application of petal-like structured light based on spatial light modulator

  • 摘要: 在一维艾里光相位模板中截取扇形相位模板,通过对扇形相位模板的圆周排列,实现了一种“瓣状”空间结构光场的相位全息图.激光经加载该相位全息图的空间光调制器反射后,在透镜焦平面形成瓣状光场.本文提出的相位生成方法可以对光场的瓣数进行自由调控,并在全息图中心区域引入涡旋光相位实现了对结构光场中心光强的调控.基于该光场通过双光子聚合方式制备出复杂微结构阵列.利用这些微结构阵列进行的微粒捕获实验证明了该结构光场在微流控等领域的潜在应用价值.

     

    Abstract: The phase hologram of petal-like structured light is realized by the circular arrangement of the sector phase mask obtained from the one-dimensional Airy beam.Femtosecond laser is reflected by the spatial light modulator encoded with the designed phase hologram, and then passes through a lens. In this way, petal-like light is formed in the focal plane of the lens. With the proposed phase generation method, one can conveniently adjust the number of lobes of the light field. By introducing the vortex phase in the central region of the phase hologram, the intensity of the structured light can be freely tuned. The microstructures array is prepared by two-photon polymerization with generated structured light. The particle capture experiment enabled by the microstructure array is carried out, and the experimental result unfolds the potential application of the structured light in microfluidic chips.

     

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