Fig. 2: Polarization-resolved LSPRs in skew ribbon arrays of WTe₂.

a, b Polarization dependence of raw extinction spectra at plasmon frequencies of 308 cm⁻¹ and 510 cm⁻¹, respectively. Degrees in black indicate the polarization of incident light. Angles of 57° and −33° in red represent the parallel and perpendicular directions of ribbon edges. 0° denotes a-axis of WTe₂. For clarity, spectra are shifted vertically. c, d The corresponding pseudocolor maps of (a, b). e, f Polarization dependence of the corresponding normalized plasmon weights of (a, b). Blue solid lines are fitting results of cos² \(\phi\). g The pseudocolor maps of the plasmon absorption spectra at different resonance frequencies. c, d, g black dashed lines denote the parallel (57°) and perpendicular (−33°) directions with respect to the ribbon and the red dashed lines denote a-axis