Thursday, 5 July 2012

Anisotropic change in THz resonance of planar metamaterials by liquid crystal and carbon nanotube

J. H. Woo, E. Choi, Boyoung Kang, E. S. Kim, J. Kim, Y. U. Lee, Tae Y. Hong, Jae H. Kim, Ilha Lee, Young Hee Lee, and J. W. Wu

Optics Express, Vol. 20, Issue 14, pp. 15440-15451 (2012)


THz metamaterials are employed to examine changes in the meta-resonances when two anisotropic organic materials, liquid crystal and carbon nanotubes, are placed on top of metamaterials. In both anisotropic double split-ring resonators and isotropic four-fold symmetric split-ring resonators, anisotropic interactions between the electric field and organic materials are enhanced in the vicinity of meta-resonances. In liquid crystal, meta-resonance frequency shift is observed with the magneto-optical coupling giving rise to the largest anisotropic shift. In carbon nanotube, meta-resonance absorptions, parallel and perpendicular to nanotube direction, experience different amount of broadening of Lorentzian oscillator of meta-resonance. Investigation reported here opens the application of metamaterials as a sensor for anisotropic materials.

These measurements were undertaken on a TeraView TPS Spectra 3000 terahertz transmission spectrometer.

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