Microwave seminar | 05 July 2021

Metamaterials are artificial electromagnetic media with spatially well-designed meta-molecules on the sub-wavelength scale. Over the past decades, many attempts have been devoted to manipulating polarization, phase, amplitude and propagation direction of electromagnetic wave using metamaterials, exploiting their flexible structural designs and potential for compact integrated optical components. Meanwhile, various intriguing phenomena have been reported in metamaterials, including anomalous refraction, invisibility, ideal Weyl point and surface state, optical activity, asymmetric transmission (AT). In this talk, we first review asymmetric transmission and polarization manipulation. In addition, we numerically, theoretically and experimentally study high-performance dichroic asymmetric transmission of linearly polarized waves in terahertz chiral metamaterial. The orthogonal arrangement between the two layers gives rise to a strong coupling between orthogonal linearly polarized states in two separated frequency bands. It is worth mentioning that the so-called dichroic AT effects are robust within a wide angle of incidence up to 60° and suitable for manipulating different linearly polarized waves. In comparison with previously reported metamaterials, S-shaped chiral metamaterial offers an opportunity to realize high-efficiency dichroic nanophotonic devices with a wide range of potential applications in optical polarization manipulation, chiral biosensing and polarization information processing. In addition, tunable polarization response in bilayered metamaterials will be also discussed.

Main paper/arXiv, related to the seminar, and other references

[1] J. H. Shi, X. C. Liu, S. W. Yu, T. T. Lv, Z. Zhu, H. F. Ma, T. J. Cui, Dual-band asymmetric transmission of linear polarization in bilayered chiral metamaterial, Appl. Phys. Lett. 102, 191905 (2013).

[2] J. H. Shi, H. F. Ma, C. Y. Guan, Z. P. Wang, and T. J. Cui, Broadband chirality and asymmetric transmission in ultrathin 90°-twisted Babinet-inverted metasurfaces, Phys. Rev. B 89, 165128 (2014).

[3] S. A. Mousavi, E.Plum, J. H. Shi, and N. I. Zheludev, Coherent control of optical polarization effects in metamaterials, Sci. Rep. 5, 8977 (2015)

[4] T. T. Lv, X. Chen, G. Dong, M. Liu, C. M. Ouyang, D. Liu, Z. Zhu, Y. Li, C. Y. Guan, J. G. Han, W. L. Zhang, S. Zhang, and J. H. Shi, Dual-band dichroic asymmetric transmission of linearly polarized waves in terahertz chiral metamaterial. Nanophotonics, 9(10), 3235–3242 (2020)