Suppressing meta-holographic artifacts by laser coherence tuning

• 作者: Yaniv Eliezer Geyang Qu Wenhong Yang Yujie Wang Hasan Y?lmaz Shumin Xiao Qinghai Song Hui Cao
• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: Articles
• 页码范围: 1236-1246
• 页数: 11页
• 语种: 英文

摘要

A metasurface hologram combines fine spatial resolution and large viewing angles with a planar form factor and compact size. However, it suffers coherent artifacts originating from electromagnetic cross-talk between closely packed meta-atoms and fabrication defects of nanoscale features. Here, we introduce an efficient method to suppress all artifacts by fine-tuning the spatial coherence of illumination. Our method is implemented with a degenerate cavity laser, which allows a precise and continuous tuning of the spatial coherence over a wide range, with little variation in the emission spectrum and total power. We find the optimal degree of spatial coherence to suppress the coherent artifacts of a meta-hologram while maintaining the image sharpness. This work paves the way to compact and dynamical holographic displays free of coherent defects.