Gozali Richard, Nguyen Thien-An, Bendau Ethan, Alfano Robert R
Department of Physics, Institute for Ultrafast Spectroscopy and Lasers, Complex Light Center, City College of New York, 160 Convent Avenue, New York, New York 10031, USA.
Rev Sci Instrum. 2017 Sep;88(9):093701. doi: 10.1063/1.5000508.
The production of orbital angular momentum (OAM) by using a q-plate, which functions as an electrically tunable spatial frequency filter, provides a simple and efficient method of edge contrast in biological and medical sample imaging for histological evaluation of tissue, smears, and PAP smears. An instrument producing OAM, such as a q-plate, situated at the Fourier plane of a 4f lens system, similar to the use of a high-pass spatial filter, allows the passage of high spatial frequencies and enables the production of an image with highly illuminated edges contrasted against a dark background for both opaque and transparent objects. Compared with ordinary spiral phase plates and spatial light modulators, the q-plate has the added advantage of electric control and tunability.
使用q板产生轨道角动量（OAM），q板作为电可调空间频率滤波器，为组织、涂片和巴氏涂片的组织学评估中的生物和医学样本成像提供了一种简单有效的边缘对比度方法。产生OAM的仪器，如q板，位于4f透镜系统的傅里叶平面，类似于高通空间滤波器的使用，允许高空间频率通过，并能够为不透明和透明物体生成边缘高度照亮、与黑暗背景形成对比的图像。与普通螺旋相位板和空间光调制器相比，q板具有电控制和可调性的额外优势。
