Abstract:
:Ultrathin transmission metasurface devices are designed on the basis of the Yang-Gu amplitude-phase retrieval algorithm for focusing the terahertz (THz) radiation into four or nine spots with focal spacing of 2 or 3 mm at a frequency of 0.8 THz. The focal properties are experimentally investigated in detail, and the results agree well with the theoretical expectations. The designed THz multi-focus lens (TMFL) demonstrates a good focusing function over a broad frequency range from 0.3 to 1.1 THz. As a transmission-type device based on metasurface, the diffraction efficiency of the TMFL can be as high as 33.92% at the designed frequency. The imaging function of the TMFL is also demonstrated experimentally and clear images are obtained. The proposed method produces an ultrathin, low-cost, and broadband multi-focus lens for THz-band application.
journal_name
Sci Repjournal_title
Scientific reportsauthors
He J,Ye J,Wang X,Kan Q,Zhang Ydoi
10.1038/srep28800subject
Has Abstractpub_date
2016-06-27 00:00:00pages
28800issn
2045-2322pii
srep28800journal_volume
6pub_type
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