Optically thin terahertz metamaterials.
Resonant properties of optically thin metamaterials are studied by terahertz time-domain spectroscopy. Both the lower energy inductor-capacitor (LC) and the higher energy dipole resonances of the planar double split-ring resonators (SRRs) exhibit characteristic evolution with various sub-skin-depth thicknesses of the constituent Pb film. The signature of the LC resonance begins to emerge at a critical thickness near 0.15 skin depth. The resonances reveal a characteristic enhancement; they are strengthened remarkably with increasing SRR thicknesses at sub-skin-depth level and then gradually saturate beyond the skin depth.
Singh
Ranjan
R
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Smirnova
Evgenya
E
Taylor
Antoinette J
AJ
O'Hara
John F
JF
Zhang
Weili
W
D007854:Lead / Q000737:chemistry; D055095:Optics and Photonics
D007854:Lead