Abstract：
:Recent emergence of metasurfaces has enabled the development of ultra-thin flat optical components through different wavefront shaping techniques at various wavelengths. However, due to the non-adaptive nature of conventional metasurfaces, the focal point of the resulting optics needs to be fixed at the design stage, thus severely limiting its reconfigurability and applicability. In this paper, we aim to overcome such constraint by presenting a flat reflective component that can be reprogrammed to focus terahertz waves at a desired point in the near-field region. To this end, we first propose a graphene-based unit cell with phase reconfigurability, and then employ the coding metasurface approach to draw the phase profile required to set the focus on the target point. Our results show that the proposed component can operate close to the diffraction limit with high focusing range and low focusing error. We also demonstrate that, through appropriate automation, the reprogrammability of the metamirror could be leveraged to develop compact terahertz scanning and imaging systems, as well as novel reconfigurable components for terahertz wireless communications.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Hosseininejad SE,Rouhi K,Neshat M,Faraji-Dana R,Cabellos-Aparicio A,Abadal S,Alarcón Edoi
10.1038/s41598-019-39266-3subject
Has Abstractpub_date
2019-02-27 00:00:00pages
2868issue
1issn
2045-2322pii
10.1038/s41598-019-39266-3journal_volume
9pub_type
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