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Beam manipulation by hybrid plasmonic-dielectric metasurfaces
, Article Plasmonics ; 2019 ; 15571955 (ISSN) ; Hemmatyar, O ; Kavehvash, Z ; Sharif University of Technology
Springer
2019
Abstract
A hybrid plasmonic-dielectric metasurface is proposed in order to manipulate beam propagation in desired manners. The metasurface is composed of patterned hybrid graphene-silicon nano-disks deposited on a low-index substrate, namely silica. It is shown that the proposed hybrid metasurface simultaneously benefits from the advantages of graphene-based metasurfaces and dielectric ones. Specially, we show that the proposed hybrid metasurface not only provides reconfigurability, just like previously proposed graphene-based metasurfaces, but also similar to dielectric metasurfaces, is of low loss and CMOS-compatible. Such exceptional features give the metasurface exceptional potentials to realize...
Beam manipulation by hybrid plasmonic-dielectric metasurfaces
, Article Plasmonics ; Volume 15, Issue 3 , 2020 , Pages 639-645 ; Hemmatyar, O ; Kavehvash, Z ; Sharif University of Technology
Springer
2020
Abstract
A hybrid plasmonic-dielectric metasurface is proposed in order to manipulate beam propagation in desired manners. The metasurface is composed of patterned hybrid graphene-silicon nano-disks deposited on a low-index substrate, namely silica. It is shown that the proposed hybrid metasurface simultaneously benefits from the advantages of graphene-based metasurfaces and dielectric ones. Specially, we show that the proposed hybrid metasurface not only provides reconfigurability, just like previously proposed graphene-based metasurfaces, but also similar to dielectric metasurfaces, is of low loss and CMOS-compatible. Such exceptional features give the metasurface exceptional potentials to realize...
Beam focusing using two-dimensional graphene-based meta-reflect-array
, Article 24th Iranian Conference on Electrical Engineering, ICEE 2016, 10 May 2016 through 12 May 2016 ; 2016 , Pages 613-616 ; 9781467387897 (ISBN) ; Abdollahramezani, S ; Arik, K ; Khavasi, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
A highly efficient two-dimensional meta-reflect-array manipulating the phase and amplitude of far-infrared electromagnetic wave is proposed. The reflect array consists of patterned graphene nano-disks resides on a subwavelenght thick optical cavity to enhance the interaction of electromagnetic wave. It is shown that the reflected wave from each unit cell can almost cover the 2π range phase shift by changing the radius of the graphene nano-disks while at the same time maximizes its amplitude. Proposing a transmission line model for the proposed structure, we realize a meta lens as a flat optics functionality. © 2016 IEEE