期刊
NANOMATERIALS
卷 11, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/nano11092410
关键词
metasurface; asymmetric optical transmission; surface plasmon polaritons; Kerker conditions
类别
资金
- National Science Foundation of China [61675074]
Asymmetric optical transmission is crucial in many optical systems. In this study, a dielectric-metal metasurface is introduced to achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. The metasurface supports a forward transmittance peak and a backward transmittance dip at the same wavelength of 922 nm, significantly enhancing operation bandwidth and contrast ratio.
Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric-metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices.
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