Mesquita Pedro H F, Jesus-Silva Alcenísio J, Fonseca Eduardo J S, Hickmann Jandir M
Optics and Materials Group – OPTMA, Universidade Federal de Alagoas, Caixa Postal 2051, Maceió, AL 57061-970, Brazil.
Opt Express. 2011 Oct 10;19(21):20616-21. doi: 10.1364/OE.19.020616.
We engineer an intensity square lattice using the Fraunhofer diffraction of a Laguerre-Gauss beam by a square aperture. We verify numerically and experimentally that a perfect optical intensity lattice takes place only for even values of the topological charge. We explain the origin of this behavior based on the decomposition of the patterns. We also study the evolution of the lattice formation by observing the transition from one order to the next of the orbital angular momentum varying the topological charge in fractional steps.
我们利用拉盖尔 - 高斯光束通过方孔的夫琅禾费衍射来构建强度方形晶格。我们通过数值和实验验证，只有在拓扑电荷为偶数时才会出现完美的光强晶格。我们基于图案的分解来解释这种行为的起源。我们还通过观察轨道角动量从一个阶次到下一个阶次的转变（以分数步长改变拓扑电荷）来研究晶格形成的演化过程。
