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Opt Express. 2011 Mar 28;19(7):5741-52. doi: 10.1364/OE.19.005741.

Continuously tunable terahertz metamaterial employing magnetically actuated cantilevers.

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Department of Electrical and Electronics Engineering, Bilkent University, Bilkent, Ankara, Turkey.


Terahertz metamaterial structures that employ flexing microelectromechanical cantilevers for tuning the resonance frequency of an electric split-ring resonator are presented. The tuning cantilevers are coated with a magnetic thin-film and are actuated by an external magnetic field. The use of cantilevers enables continuous tuning of the resonance frequency over a large frequency range. The use of an externally applied magnetic field for actuation simplifies the metamaterial structure and its use for sensor or filter applications. A structure for minimizing the actuating field is derived. The dependence of the tunable bandwidth on frequency is discussed.

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