Fig. 1: Characterization of a typical 2M-WS2 film.
From: Tunable anisotropic van der Waals films of 2M-WS2 for plasmon canalization
a An illustration of the 2M-WS2 crystal structure, with the unit cell marked by the light-gray frame. b A scheme for the infrared spectra measurement with polarized light, where the in-plane electric field E and magnetic field H are indicated. c An optical image of a typical 2M-WS2 film with a thickness of ~50 nm on a diamond substrate. The dashed box in the image represents the measurement area, and the principal axes of the film are indicated as “b” and “c”. The scale bar is 50 μm. d The extinction spectra with light polarization along the two principal axes of the 2M-WS2 film in c at room temperature and 81 K.
