Resonators and the way they couple to exteal radiation rely on very different concepts if one considers devices belonging to the photonic and electronic worlds.The terahertz frequency range,however,provides intriguing possibilities for the development of hybrid technologies that merge ideas from both fields in novel functional designs.In this paper,we show that high-quality,subwavelength,whispering-gallery lasers can be combined to form a linear dipole antenna,which creates a very efficient,low-threshold laser emission in a collimated beam pattem.For this purpose,we employ a terahertz quantum-cascade active region patteed into two 19-1μm-radius microdisks coupled by a suspended metallic bridge,which simultaneously acts as an inductive antenna and produces the dipole symmetry of the lasing mode.Continuous-wave vertical emission is demonstrated at approximately 3.5THz in a very regular,low-divergence (±10°) beam,with a high slope efficiency of at least 160 mWA-1 and a mere 6 mA of threshold current,which is ensured by the ultra-small resonator size (VRES/λ3≈10-2).The extremely low power consumption and the superior beam brightness make this concept very promising for the development of miniaturized and portable THz sources to be used in the field for imaging and sensing applications as well as for exploring novel optomechanical intracavity effects.