期刊
OPTICS COMMUNICATIONS
卷 370, 期 -, 页码 306-310出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2016.03.031
关键词
Metalens; Phase and amplitude modulation; Multiple focal points; THz frequency range
类别
Metasurfaces, the 2D form of metamaterials with their ability in phase, amplitude and polarization manipulation are widely used in designing optical devices. Efforts to find proper photonic components in the terahertz (THz) range of frequency lead us to adopt metasurfaces as their constituent elements. Here, we conceived a broadband THz lens with an adjustable number and arrangement of focal points. To have a full control over the lens functionality, we used a metasurface with the capability of simultaneously modulating the amplitude and phase of the incident wave. C-shaped ring resonators (CSRRs) with different geometry and orientation capable of simultaneously manipulating phase and amplitude of the scattered fields, are proper choice to design the lens. We show that the introduced lens in a one-dimensional layout has a wide range of working frequencies within the THz spectrum, which can be used in a plethora of applications. (C) 2016 Elsevier B.V. All rights reserved.
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