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Arbitrary manipulation of broadband terahertz waves with flexiblepolarization shaping at the source has great potential in expanding realapplications such as imaging, information encryption, and all-opticallycoherent control of terahertz nonlinear phenomena. Topological insulatorsfeaturing unique spin-momentum locked surface state have already exhibited verypromising prospects in terahertz emission, detection and modulation, which maylay a foundation for future on-chip topological insulator-based terahertzsystems. However, polarization shaped terahertz emission with prescribedmanners of arbitrarily manipulated temporal evolution of the amplitude andelectric-field vector direction based on topological insulators have not yetbeen explored. Here we systematically investigated the terahertz radiation fromtopological insulator Bi2Te3 nanofilms driven by femtosecond laser pulses, andsuccessfully realized the generation of efficient chiral terahertz waves withcontrollable chirality, ellipticity, and principle axis. The convenientengineering of the chiral terahertz waves was interpreted by photogalvaniceffect induced photocurrent, while the linearly polarized terahertz wavesoriginated from linear photogalvanic effect induced shift currents. We believeour works not only help further understanding femtosecond coherent control ofultrafast spin currents in light-matter interaction but also provide aneffective way to generate spin-polarized terahertz waves and accelerate theproliferation of twisting the terahertz waves at the source.

Generation and manipulation of chiral terahertz waves emitted from the three-dimensional topological insulator Bi2Te3