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(a) Normalized THz transmission amplitudes of the graphene ring, H-shaped structure, and both of them. (b,d) Distributions of electric field at frequency points Dip1, Dip2, and Dip3. These three points are corresponded to the frequencies: (b) 1.70 THz, (c) 2.38 THz, and 2.2 THz, respectively.
