Fraunhofer diffraction of Laguerre–Gaussian beam caused by a dynamic superposed dual-triangular aperture

• Main Authors: Li, Xinzhong, Tai, Yuping, Nie, Zhaogang, Wang, Hui, Li, Hehe, Wang, Jingge, Tang, Jie, Wang, Yishan
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2016
• Subjects: diffraction; optical vortices; Laguerre–Gaussian beam; dynamic aperture
• Online Access: https://hdl.handle.net/10356/82354; http://hdl.handle.net/10220/39977
• Institution: Nanyang Technological University

We investigate the Fraunhofer diffraction of a Laguerre–Gaussian (LG) beam incident on a dynamic superposed dual-triangular aperture. The evolution of the diffraction pattern from this aperture is analyzed experimentally and theoretically. A special aperture, called the hex-star triangular aperture, demonstrates interesting diffraction patterns. Further, the diffraction properties of integer, half-integer, and fractional orders of topological charges at the Fraunhofer zone are studied by using the hex-star triangular aperture. This study can provide additional information to enhance the understanding of the diffraction properties of the LG beam transmitted through a complex aperture.