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Tunable THz Switch-Filter Based on Magneto-Plasmonic Graphene Nanodisk

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Document pages: 15 pages

Abstract: We propose and analyze a multifunctional THz device which can operate as atunable switch and a filter. The device consists of a circular graphenenanodisk coupled to two nanoribbons oriented at $90^ circ$ to each other. Thegraphene elements are placed on a dielectric substrate. The nanodisk ismagnetized by a DC magnetic field normal to its plane. The physical principleof the device is based on the propagation of surface plasmon-polariton waves inthe graphene nanoribbons and excitation of dipole modes in the nanodisk.Numerical simulations show that 0.61T DC magnetic field provides transmission(regime ON) at the frequency 5.33 THz with the bandwidth 12.7$ $ and filteringwith the Q-factor equals to 7.8. At the central frequency, the insertion lossis around -2 dB and the reflection coefficient is -43 dB. The regime OFF can beachieved by means of switching DC magnetic field to zero value or by switchingchemical potential of the nanodisk to zero with the ON OFF ratio better than 20dB. A small central frequency tuning by chemical potential is possible with afixed DC magnetic field.

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