Integrated terahertz generator-manipulator using epsilon-near-zero-hybrid nonlinear metasurfaces

Yongchang Lu, Xi Feng, Qingwei Wang, Xueqian Zhang, Ming Fang, Wei E.I. Sha, Zhixiang Huang, Quan Xu, Li Niu, Xieyu Chen, Chunmei Ouyang, Yuanmu Yang, Xixiang Zhang, Eric Plum, Shuang Zhang, Jiaguang Han, Weili Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

In terahertz (THz) technologies, generation and manipulation of THz waves are two key processes usually implemented by different device modules. Integrating THz generation and manipulation into a single compact device will advance the applications of THz technologies in various fields. Here, we demonstrate a hybrid nonlinear plasmonic metasurface incorporating an epsilon-near-zero (ENZ) indium tin oxide (ITO) layer, for seamlessly combining efficient generation and manipulation of THz waves across a wide frequency band. The coupling between the plasmonic resonance of the metasurface and the ENZ mode of the ITO thin film enhances the THz conversion efficiency by more than four orders of magnitude. Meanwhile, such a hybrid device is capable of shaping the polarization and wavefront of the emitted THz beam via the engineered nonlinear Pancharatnam-Berry (PB) phases of the plasmonic meta-atoms. The presented hybrid nonlinear metasurface opens a new avenue towards miniaturized integrated THz devices and systems with advanced functionalities.
Original languageEnglish (US)
JournalNano Letters
DOIs
StatePublished - 2021

ASJC Scopus subject areas

  • Bioengineering
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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