期刊
SCIENCE BULLETIN
卷 64, 期 20, 页码 1525-1531出版社
ELSEVIER
DOI: 10.1016/j.scib.2019.08.004
关键词
Far infrared or terahertz; Achromatic; Metasurface; Diffraction theory
资金
- National Natural Science Foundation of China [11874266, 11604208, 61705131, 81701745, 11822406, 11834007, 11674167, 11621091, 11774164, 91850204]
- Shanghai Science and Technology Committee of China [16ZR1445600, 16ZR1445500]
- Chen Guang Program of China [17CG49]
- National Key R&D Program of China [2017YFA0303700, 2016YFA0202103]
Achromatic focusing is essential for broadband operation, which has recently been realised from visible to infrared wavelengths using a metasurface. Similarly, multi-terahertz functional devices can be encoded in a desired metasurface phase profile. However, metalenses suffer from larger chromatic aberrations because of the intrinsic dispersion of each unit element. Here, we propose an achromatic metalens with C-shaped unit elements working from 0.3 to 0.8 THz with a bandwidth of approximately 91% over the centre frequency. The designed metalens possesses a high working efficiency of more than 68% at the peak and a relatively high numerical aperture of 0.385. We further demonstrate the robustness of our C-shaped metalens, considering lateral shape deformations and deviations in the etching depth. Our metalens design opens an avenue for future applications of terahertz meta-devices in spectroscopy, time-of-flight tomography and hyperspectral imaging systems. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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