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(a) Experimental configuration for the terahertz transmission measurements of a periodic array of planar metamaterials. (b) Schematic of the rectangular double SRR unit cell and the silicon substrate with a minimum feature in the splits of the rings and other structural dimensions , , and a lattice periodicity .
Measured (a) and simulated (b) amplitude transmission spectra of the rectangular double SRRs with varying asymmetry. The inset of (b) shows transmission spectra of the equidirectional displaced rectangular SRRs with , respectively.
(a) Simulated far-field electric field distribution of the rectangular SRRs with varying asymmetry at the LC resonance. (b) The upper and lower squares represent the numerical dip values of and at resonance frequency, respectively. The blue and red lines represent the fitting curves, in which , , , and . (c) PCR with varying asymmetry. [(d) and (e)] Simulated surface electric field distribution of equidirectionally (d) and oppositely (e) displaced SRRs with .
Measured (a) and simulated (b) amplitude transmission spectra of the capacitor-enhanced double SRRs with varying asymmetry. [(c) and (d)] show the measured and simulated spectra of the crossed double SRRs. [(e) and (f)] show the measured and simulated spectra of the circular double SRRs.
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