Applied Physics Letters · 2008 · 68 citations · 13 references
EngineeringElectrical EngineeringAntennasOpticsPhotonicsAntenna RadiationBeam SteeringHorn AntennasMicrowave AntennasTerahertz PhotonicsTerahertz SpectroscopyFar-field RadiationHorn Antenna DirectivityQuantum Cascade LasersTerahertz AntennasTerahertz Beam SteeringTerahertz Quantum Cascade Lasers
A 2.8 THz metal-metal quantum cascade laser operating with a microtransverse-electromagnetic-horn antenna has been demonstrated. By comparing the far-field radiation pattern to a standard ridge cavity with a cleaved facet, a striking improvement of the directionality is observed. The effectiveness of the horn antenna is critically dependent on the control of the lateral modes in the laser cavity.
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