4 January 2008 Terahertz electromagnetic response for metamaterial
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Proceedings Volume 6840, Terahertz Photonics; 68401K (2008); doi: 10.1117/12.759611
Event: Photonics Asia 2007, 2007, Beijing, China
Abstract
Recently, more and more groups are concentrating on learning surface plasma on metal split with sub-wavelength of terahertz. There is a new material which is made of two materials named metamaterial. It is combined with semiconductor and metal materials. Metal parts are made with subwavelength microstructure. Abnormal phenomenon occurred when it is excited by an intense light, showing an enhancement transmission of terahertz wave. In this paper, we design a planar structure composed of gallium arsenide (substrate) and copper (metal). Copper array is plating on a GaAs wafer on order of micron with photoetching technology. The thickness of GaAs and copper layer are 650 and 0.5 micros individually. THz incidence has an enhanced transmission like surface plasmonic resonance with terahertz time-domain system when another exciting lighted on, which made current carriers in photoconductor. This resonance arises from an inductor-capacitor circuit resonance. Comparison is performed between results with and without excitation. The angle of sample plane with terahertz polarization and incidence can affect this electromagnetic response in some degree. Its transmittance with back-incidence is much stronger than that with front-incidence at certain frequencies. This kind of artificial structure has potential abilities in terahertz devices in the future. It is helpful to develop terahertz filter, polarizing film, beam reflector, phase retarder and so on.
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Xue Jiang, Ziyu Yan, Bin Jin, Yu Wang, Cunlin Zhang, "Terahertz electromagnetic response for metamaterial", Proc. SPIE 6840, Terahertz Photonics, 68401K (4 January 2008); doi: 10.1117/12.759611; https://doi.org/10.1117/12.759611
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KEYWORDS
Gallium arsenide

Metals

Terahertz radiation

Electromagnetism

Absorption

Copper

Metamaterials

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