Terahertz plasmonic high pass filter

Wu, Dongmin; Fang, Nicholas; Sun, Cheng; Zhang, Xiang; Padilla, Willie J.; Basov, Dimitri N.; Smith, David R.; Schultz, Sheldon
July 2003
Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p201
Academic Journal
Metamaterials, which contain engineered subwavelength microstructures, can be designed to have positive or negative ∊ and μ at desired frequencies. In this letter, we demonstrate a metamaterial which has a "plasmonic" response to electromagnetic waves in the terahertz (THz) range. The sharp change of reflection and transmission at this plasma frequency makes the structure a high pass filter. The reflection response is characterized by Fourier transform infrared spectroscopy, and a plasma frequency at 0.7 THz is observed, which agrees with the theoretical calculation. The metamaterial is a two-dimensional cubic lattice consisting of thin metal wires, having wire diameter of 30 μm, lattice constant of 120 μm, and wire length of 1 mm. The microstereolithography technique is employed to fabricate the high-aspect-ratio lattice.


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