Fritz Haber Institute of the Max Planck Society;
14195 Berlin;
Germany;
Department of Electrical;
Computer;
and Systems Engineering;
Rensselaer Polytechnic Institute;
Troy;
NY 12180;
USA;
CNR-SPIN;
Dipartimento di Fisica;
Universita`di Napoli Federico II;
Napoli;
Italy;
NUSNNI-Nanocore;
National University of Singapore;
Singapore;
terahertz metamaterial; terahertz optics; terahertz polarization control;