Ultra-compact Spatial Terahertz Switch Based on Graphene Plasmonic-Coupled Waveguide |
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Authors: | Dehghan Mehdi Moravvej-Farshi Mohammad Kazem Ghaffari-Miab Mohsen Jabbari Masoud Darvish Ghafar |
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Affiliation: | 1.Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, 1477893855, Iran ;2.Faculty of Electrical and Computer Engineering, The Nano Plasmo-Photonic Research group, Tarbiat Modares University, Tehran, 1411713116, Iran ;3.Department of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran ; |
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Abstract: | We are proposing graphene (G)-based multilayered plasmonic spatial switch, operating at 10 THz. It is composed of hBN/Ag/hBN/G/hBN/G/hBN/SiO2/p+-Si multilayers. When a 10-THz transverse magnetic (TM)-polarized signal is normally incident upon the structure top surface, the nanoaperture devised in the Ag nanolayer, acting as a grating, excites surface plasmons at the top graphene micro-ribbons/hBN interface. These surface plasmons depending on the graphenes chemical potentials can be coupled to the lower-right or left graphene micro-ribbons and continue to propagate laterally towards the corresponding output port. Numerical simulations show that a change of ∆VG ≈ ± 2.7 V in the voltage, applied to the gated micro-ribbons, can modulate their chemical potentials sufficiently to switch the right (left) output port from ON (OFF) to OFF(ON) and vice versa. Besides its low power consumption, the switch ultra-small dimensions make it a potential spatial router suitable for THz-integrated circuit applications. |
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