Optical Properties of Polaritonic Materials, Especially Dirac Materials in THz Band.
Dirac materials (Semi-metals and TIs): Graphene, Bi2Se3, Bi2Te3, Cd3As2, and so on. Magnetic materials: Mn3Sn, Co2MnGa, YIG, TmFeO3, and so on. TMD materials: PtTe2, WSe2, MoSe2, ReSe2 and so on. Other materials: MXene (Ti3C2Tz), and so on.
Ultrafast Carrier Dynamics Investigated by Pump-Probe Terahertz Spectroscopy.
Optical-pump terahertz-probe (OPTP, ZnTe), Terahertz-pump terahertz-probe (LiNbO3), and so on.
Scattering-Type Scanning Near-Field Optical Microscopy (s-SNOM), Especially in THz Band.
Near-field imaging and spectroscopy of thin-film 2D materials (graphene, MXene, ...). Near-field model of the sample-probe interactions.
Free-Electron Radiations in Materials and Structures, Especially in Plasmonic and Hyperbolic Mediums.
Cherenkov radiation, Smith-Purcell radiation, Transition radiation, and so on.