Journal
OPTICS LETTERS
Volume 45, Issue 22, Pages 6146-6149Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.403377
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Funding
- National Key Research and Development Program of China [2017YFA0701004]
- National Natural Science Foundation of China [61605143, 61722509, 61735012, 61871212, 61875150, 61935015]
- Tianjin Municipal Fund for Distinguished Young Scholars [18JCJQJC45600]
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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 degrees 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. (C) 2020 Optical Society of America
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