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Stacking bilayer structures is an efficient way to tune the topology ofpolaritons in in-plane anisotropic films, e.g., by leveraging the twist angle(TA). However, the effect of another geometric parameter, film thickness ratio(TR), on manipulating the plasmon topology in bilayers is elusive. Here, wefabricate bilayer structures of WTe2 films, which naturally host in-planehyperbolic plasmons in the terahertz range. Plasmon topology is successfullymodified by changing the TR and TA synergistically, manifested by theextinction spectra of unpatterned films and the polarization dependence of theplasmon intensity measured in skew ribbon arrays. Such TR- and TA-tunabletopological transitions can be well explained based on the effective sheetoptical conductivity by adding up those of the two films. Our studydemonstrates TR as another degree of freedom for the manipulation of plasmonictopology in nanophotonics, exhibiting promising applications in bio-sensing,heat transfer and the enhancement of spontaneous emission.

Twist-angle and thickness-ratio tuning of plasmon polaritons in twisted bilayer van der Waals films