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(a) Single eSRR structures SRR1, SRR2, and dual-band nested SRR structure A and (b) single eSRR structures SRR3, SRR4 and dual-band nested SRR structure B with the following geometric parameters: l = 52 μm, l 2 = 36 μm, g = 16 μm, g1 = 20 μm, g2 = 8 μm, g3 = 4 μm, and w = 4 μm. The lattice constant p is set to be 60 μm.
Simulated transmission characteristics of the dual-band THz metamaterials: (a) structure A and (b) structure B.
Surface current densities (a) for structure A at the primary resonance frequency of 0.98 THz, (b) for structure B at the primary resonance frequency of 0.8 THz, and (c) for structure A at the second resonance frequency of 2.52 THz, (d) for structure B at the second resonance frequency of 2.1 THz. (e) Equivalent circuit representation based on surface current density distribution at the second resonant frequency.
Transmission characteristic of the two fabricated metamaterials. The simulated transmission characteristics of (a) structure A and (b) structure B. The measured transmission characteristics of (c) the structure A and (d) the structure B. Insets in (c) and (d) show SEM images of the fabricated metamaterials.
Performance comparison of the fabricated dual-band MMs.
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