Abstract
Metasurfaces can reshape the wavefront in the desired manner by manipulating the phase profile and amplitude of the incident wave. In this paper, we demonstrate an ultrathin terahertz metalens based on our designed resonator structure, where the polarization state can be converted to the orthogonal direction and the parabolic phase profile is designed covering a 2π phase region. Many functional metalenses are also engineered to meet the demand of focusing, dual-polarization confocal, and dual focuses for orthogonal polarization in the frequency range from 0.65 to 0.8 THz. The presented metalenses can provide potential applications in terahertz communications and imaging systems.
Highlights
Metasurfaces, a category of 2D planar metamaterials, have shown extraordinary capability in arbitrarily controlling electromagnetic waves, enabling novel electromagnetic phenomena such as anomalous refraction/reflection [1, 2], polarization conversion [3, 4], wave plates [5], flat lenses [6,7,8,9,10], vortex beam [11], and hologram [12]
Metalenses have been widely studied at the frequency range of optics [6], terahertz [7, 8], and microwave [10]
The metalens composed of the wire connected reticle-like resonator (WCRR) can converge the transmission waves, achieving the phenomenon of focusing and extinction in two orthogonal polarization directions, and realize the horizontal separation of the focal points of the outgoing wave in two orthogonal polarization directions
Summary
Metasurfaces, a category of 2D planar metamaterials, have shown extraordinary capability in arbitrarily controlling electromagnetic waves, enabling novel electromagnetic phenomena such as anomalous refraction/reflection [1, 2], polarization conversion [3, 4], wave plates [5], flat lenses [6,7,8,9,10], vortex beam [11], and hologram [12]. In 2013, Capasso’s group proposed an optical planar lens and axicons using V-shaped resonators [6]. The abovementioned metalenses have the same characteristics where the cross-polarized waves are focused. We proposed several metalenses based on our designed cross-polarization resonator to meet those requirements mentioned above, by arranging the position and orientation of resonators on the metasurface. 2D resonator arrays are arranged in a specific order, and the transmission wave under orthogonal polarization states realizes lateral separation. Such proposed metalenses pave a novel way for planar terahertz device designs
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
