Atomically thin noble metal dichalcogenides for phase-regulated meta-optics

Yingwei Wang, Zi-Lan Deng, Dejiao Hu, Jian Yuan, Qingdong Ou, Fei Qin, Yinan Zhang, Xu Ouyang, Yue Li, Bo Peng, Yaoyu Cao, Bai Ou Guan, Yupeng Zhang, Jun He, Cheng-Wei Qiu, Qiaoliang Bao, Xiangping Li

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Owing to its good air stability and high refractive index, two-dimensional (2D) noble metal dichalcogenide shows intriguing potential for versatile flat optics applications. However, light field manipulation at the atomic scale is conventionally considered unattainable because the small thickness and intrinsic losses of 2D materials completely suppress both resonances and phase accumulation effects. Here, we demonstrate that losses of structured atomically thick PtSe2 films integrated on top of a uniform substrate can be utilized to create the spots of critical coupling, enabling singular phase behaviors with a remarkable π phase jump. This finding enables the experimental demonstration of atomically thick binary meta-optics that allows an angle-robust and high unit thickness diffraction efficiency of 0.96%/nm in visible frequencies (given its thickness of merely 4.3 nm). Our results unlock the potential of a new class of 2D flat optics for light field manipulation at an atomic thickness.

Original languageEnglish
Pages (from-to)7811-7818
Number of pages8
JournalNano Letters
Volume20
Issue number11
DOIs
Publication statusPublished - 11 Nov 2020

Keywords

  • 2D materials
  • meta-hologram
  • meta-lens
  • meta-optics
  • noble metal dichalcogenides

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