A metamaterial absorber for the terahertz regime: design, fabrication and characterization.
We present a metamaterial that acts as a strongly resonant absorber at terahertz frequencies. Our design consists of a bilayer unit cell which allows for maximization of the absorption through independent tuning of the electrical permittivity and magnetic permeability. An experimental absorptivity of 70% at 1.3 terahertz is demonstrated. We utilize only a single unit cell in the propagation direction, thus achieving an absorption coefficient alpha = 2000 cm(-1). These metamaterials are promising candidates as absorbing elements for thermally based THz imaging, due to their relatively low volume, low density, and narrow band response.
Tao
Hu
H
Department of Manufacturing Engineering, Boston University,Brookline, Massachusetts 02446, USA.
Landy
Nathan I
NI
Bingham
Christopher M
CM
Zhang
Xin
X
Averitt
Richard D
RD
Padilla
Willie J
WJ
D000465:Algorithms; D003198:Computer Simulation; D004563:Electrochemistry / Q000379:methods*; D004867:Equipment Design; D008280:Magnetics; D008422:Materials Testing; D008872:Microwaves; D015233:Models, Statistical; D008962:Models, Theoretical; D010539:Permeability; D017785:Photons; D012031:Refractometry / Q000379:methods