A composite right/left-handed metamaterial waveguide for terahertz quantum-cascade lasers is presented. Left handed (backward wave) propagation is confirmed by using the waveguide as a leaky-wave antenna where directional beams at angles of −4° and −63° are experimentally observed at excitation frequencies 2.59 and 2.48 THz, respectively.

© 2013 Optical Society of America

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