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|Title:||Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces|
|Citation:||Optics Letters, 2017; 42(9):1867-1870|
|Publisher:||Optical Society of America|
|Chun-Chieh Chang, Daniel Headland, Derek Abbott, Withawat Withayachumnankul and Hou-Tong Chen|
|Abstract:||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 2π 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-μm-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.|
|Rights:||© 2017 Optical Society of America|
|Appears in Collections:||Physics publications|
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