Dynamic shaping of vectorial optical fields based on two-dimensional blazed holographic grating

• 来源期刊: 中国物理B（英文版）
• 关键词: diffraction polarization holographic gratings liquid-crystal devices
• 年，卷（期）: 2020,（1）
• 页码范围: 82-88
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab5a3b

摘要

We propose a vectorial optical field generation system based on two-dimensional blazed grating to high-efficiently generate structured optical fields with prescribed amplitude, phase, and polarization. In this system, an optimized blazed grating hologram is written on a spatial light modulator (SLM) and can diffract the majority of the incident light into the first-order diffractions of the x and y directions, which then serve as base vectors for synthesizing desired vector beams. Compared with the conventional cosine grating used in the previous work, the proposed two-dimensional, blazed grating has a much higher efficiency. Both computer simulation and optical experiment validate that a conversion efficiency up to 5 times that of the former work is achieved. Our method can facilitate applications of the optical field manipulation.