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https://hdl.handle.net/11147/13660
Title: | Terahertz Wavefront Engineering Using a Hard-Coded Metasurface | Authors: | Noori, Aileen Akyürek, Bora Demirhan, Yasemin Özyüzer, Lütfi Güven, Kaan Altan, Hakan Aygün, Gülnur |
Keywords: | Anomalous reflection Coding metamaterials Terahertz waves Wavefront engineering Digital control systems |
Publisher: | Springer | Abstract: | During the past few years, coding metamaterials (MM) drew significant attention, where the far-field scattering/transmission pattern of the electromagnetic wave (particularly in the THz regime) can be encoded into a single or few-bit digitized phase-response of the metasurface, thereby enabling a full digital control. Single-bit MMs contain two types of unit cells where the phase becomes 0 and 1 (in units of ?), respectively. By arranging these unit cells into a 2D surface pattern, the THz wavefront can be shaped. In this work, a novel hard-coded metasurface was designed, fabricated, and experimentally investigated for multi-beam reflection of incident THz beam. The design employs stripe and checkerboard patterns of bilayer MM unit cells consisting of square gold patches with a polymer spacing layer from a gold backplane. Experimental and simulation results show that the incident wave in the 0.500–0.750 THz range can be reflected with > 95% efficiency in uniform amplitude and 1-bit coded phase. For the checkerboard metasurface pattern, the measured and analytically calculated reflection angle shows good agreement. The metasurface design is suitable for large-scale fabrication and can potentially be used as a template in the development of actively coded metasurfaces. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature. | URI: | https://doi.org/10.1007/s11082-023-04955-x https://hdl.handle.net/11147/13660 |
ISSN: | 0306-8919 |
Appears in Collections: | Physics / Fizik Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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1-s2.0-S0023643823005741-main.pdf | 7.88 MB | Adobe PDF | View/Open |
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