Cottrell Don M, Davis Jeffrey A, Hernandez Travis J
Department of Physics, San Diego State University, San Diego, California 92182-1233, USA.
Opt Express. 2011 Jul 4;19(14):12873-8. doi: 10.1364/OE.19.012873.
The Fraunhofer diffraction pattern from a partially blocked spiral phase plate (SPP) produces a partial vortex output pattern that is rotated by 90 degrees compared with the input. The rotation direction depends on whether the angular phase pattern increases in the clockwise or counterclockwise direction. In this work, we present an explanation of this effect based on careful examination of classical diffraction theory and show new experimental results. This approach is very convenient for easily determining the sign of the vortex charge.
来自部分遮挡的螺旋相位板（SPP）的夫琅禾费衍射图样会产生一个部分涡旋输出图样，该图样相对于输入图样旋转了90度。旋转方向取决于角相位图样是沿顺时针方向还是逆时针方向增加。在这项工作中，我们通过仔细研究经典衍射理论对这种效应给出了解释，并展示了新的实验结果。这种方法对于轻松确定涡旋电荷的符号非常方便。
