Multi-foci metalens for terahertz polarization detection

Ruoxing Wang, Jin Han, Jianlong Liu, Hao Tian, Weimin Sun, Li Li, Xianzhong Chen

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)
53 Downloads (Pure)


We propose a reflective terahertz (THz) metalens with four focal points for polarization detection of THz beams. The metalens is composed of Z-shaped resonators with spatially variant orientations, a reflective gold layer, and a dielectric spacer between them. The polarization states of the focal points include left circular polarization, right circular polarization, an incident polarization state, and a polarization state whose major axis is rotated π/4 in comparison with that of the incident polarization. The handedness, ellipticity, and major axis of the polarization state can be determined based on the light intensities of the focal points. The uniqueness of the designed device renders this technique very attractive for applications in compact THz polarization detection and information processing.

Original languageEnglish
Pages (from-to)3506-3509
Number of pages4
JournalOptics Letters
Issue number13
Early online date23 Jun 2020
Publication statusPublished - 1 Jul 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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