The real-space imaging of propagating THz polaritons, coupled light-matter excitations, in topological insulators has been elusive so far. Here, the authors report spectroscopic THz near-field images of the topological insulator Bi2Se3 revealing polaritons formed by coupling of THz radiation to optical phonons and various charge carriers.
- Shu Chen
- Andrei Bylinkin
- Rainer Hillenbrand
