A close-ring pair terahertz metamaterial resonating at normal incidence.
We present a systematic study of a close-ring pair based freestanding metamaterial fabricated by double-layer, self-aligned photolithography. Terahertz time-domain spectroscopy transmission measurements and numerical simulations have revealed negative index of refraction in the frequency range of 0.66-0.90 THz under normal wave incidence. The observed resonance behaviors can be well explained by a theoretical circuit model. The electromagnetic properties and the figure of merit of such close-ring metamaterials are also explored in terms of geometrical parameters of the unit cell with a goal of providing optimized design for three-dimensional metamaterials and potential device applications.
Gu
Jianqiang
J
School of electrical and computer Engineering, Oklahoma State University, Oklahoma 74078, USA.
Han
Jiaguang
J
Lu
Xinchao
X
Singh
Ranjan
R
Tian
Zhen
Z
Xing
Qirong
Q
Zhang
Weili
W
D003198:Computer Simulation; D008027:Light; D008420:Manufactured Materials; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D055053:Terahertz Radiation