Extrinsic optical activity in all-dielectric terahertz metamaterial

Shijun Yang, Yanfeng Li*, Xieyu Chen, Quanlong Yang, Jiaguang Han, Weili Zhang

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Chiral metamaterials have attracted wide interest because strong optical activity at designed frequencies could be achieved beyond that in natural materials. Here we propose an all-dielectric metamaterial with strong extrinsic circular dichroism and circular birefringence by periodically arranging symmetry-broken dielectric Mie resonators at terahertz frequencies. The strong interaction between the electric and magnetic resonances from circularly polarized incident waves dominates the performance of the all-dielectric metamaterial, which exhibits a 60% circular dichroism in transmission and a polarization rotation angle of 60 at maximum, respectively. Additionally, the spectral range of the circular dichroism with preserved amplitude can be adjusted continuously in the frequency range from 0.67–0.79 THz by tuning the tilt angle of the incident wave. Our findings will be of great potential in polarization control applications such as asymmetric transmission, optical isolation, and on-chip chiral manipulation.

    Original languageEnglish
    Pages (from-to)6146-6149
    Number of pages4
    JournalOptics Letters
    Volume45
    Issue number22
    DOIs
    Publication statusPublished - 15 Nov 2020

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