A magnetically active terahertz plasmonic artificial material

Baron, C. A.; Elezzabi, A. Y.
February 2009
Applied Physics Letters;2/16/2009, Vol. 94 Issue 7, pN.PAG
Academic Journal
We present an actively tunable plasmonic artificial material consisting of random mixtures of subwavelength metallic and dielectric particles. Active control of terahertz particle plasmons is achieved via anisotropic magnetoresistance in ferromagnetic microparticles. The phenomenon is exploited to alter the group velocity of terahertz pulses by an amount adjustable via an external magnetic field. In a proof of principle experimental demonstration, we show how the artificial material can dynamically alter the propagation direction of terahertz pulses. Active terahertz plasmonic devices remain relatively unexplored, and the means of control enabled by this work may be applicable in photonic based information technologies.


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