Detour phase Talbot array illuminator

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（7）
• 页码范围: 7-11
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201917.070501

摘要

In this Letter,we propose a simple and effective approach for transforming a conventional Talbot array illuminator (TAI) with multilevel phase steps into a binary-phase TAI (BP-TAI) through detour phase encoding.The BP-TAI is a binary (0π) phase-only diffractive optical element,which can be utilized to generate a large-scale focal spots array with a high compression ratio.As an example,we design a square BP-TAI with the fraction parameter β=15 for achieving a square multifocal lattice with a high compression ratio β2.Theoretical analysis and experimental results demonstrate that the detour phase encoding is efficient for designing the BP-TAI,especially with the high compression ratio.Such results may be exploited in practical large-scale optical trapping and X-ray imaging.