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Flexible manipulation of terahertz-wave polarization during the generationprocess is very important for terahertz applications, especially for thenext-generation on-chip functional terahertz sources. However, currentterahertz emitters could not satisfy such demand, hence calling for newmechanism and conceptually new terahertz source. Here we demonstrate amagnetic-field-controlled, highly-efficient, cost-effective, and broadbandterahertz source with flexible switch of terahertz polarization states inferromagnetic heterostructures driven by femtosecond laser pulses. We verifythat the chirality, azimuthal angle, and ellipticity of the generatedelliptical terahertz waves can be independently manipulated by delicatelyengineering of the external applied magnetic fields via effectivelymanipulating the photo-induced spin currents. Such an ultrafast photomagneticinteraction-based, magnetic-field-controlled, and broadband tunable solid-stateterahertz source integrated with terahertz polarization tunability function notonly has the capability to reveal physical mechanisms of femtosecond spindynamics, but also demonstrates the feasibility to realize novel on-chipterahertz functional devices, boosting the potential applications forcontrolling elementary molecular rotations, phonon vibrations, spinprecessions, high-speed terahertz communication, and accelerating thedevelopment of ultrafast terahertz opto-spintronics.

Broadband Magnetic-Manipulated Spintronic Terahertz Emitter with Arbitrarily Tunable Polarizations