Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep28800
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Funding
- 973 Program of China [2013CBA01702]
- National Natural Science Foundation of China [11474206, 61205097, 11204188, 91233202, 11374216, 11174211, 11404224]
- National High Technology Research and Development Program of China [2012AA101608-6]
- Beijing Natural Science Foundation [1132011]
- Program for New Century Excellent Talents in University [NCET-12-0607]
- CAEP THz Science and Technology Foundation [CAEPTHZ201306]
- Scientific Research Project of Beijing Education Commission [KM201310028005]
- Beijing youth top-notch talent training plan [CITTCD201504080]
- Specialized Research Fund for the Doctoral Program of Higher Education [20121108120009]
- Scientific Research Base Development Program of the Beijing Municipal Commission of Education
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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
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