Time-resolved broadband analysis of split ring resonators in terahertz region

Abstract

Split ring resonators (SRRs) in micrometer scale were fabricated by photolithography and lift-off technologies. The transmission and dispersion characteristics of SRR were measured by terahertz spectroscopy in broadband time domain. Significant resonances at about 0.88 and 2.01 THz have been observed, where two stop-band gaps are formed in the dispersion spectrum of SRR. It is suggested that these two minimum dips in the transmission spectrum are induced by dipole and magnetodipole resonances. The results show good agreement with the effective medium theory and the numerical calculation of electromagnetic propagation using finite-difference time-domain method. © 2006 American Institute of Physics.