Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces

Chun Chieh Chang, Daniel Headland, Derek Abbott, Withawat Withayachumnankul, Hou Tong Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2p range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μ m-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ~68% overall efficiency at the operating frequency of 400 GHz. This device has potential for applications in terahertz imaging and communications, as well as beam control in general.

Original languageEnglish
Pages (from-to)1867-1870
Number of pages4
JournalOptics Letters
Issue number9
Publication statusPublished - 2017 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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