Fig. 1: Characterization of 2H-TaSe2 ribbon arrays.
From: Plasmons in the van der Waals charge-density-wave material 2H-TaSe2
a The crystal structures of 2H-TaSe2 viewed along c-axis (monolayer) and b-axis directions (bilayer). The gray and red atoms represent tantalum (Ta) and selenium (Se) atoms, respectively, and the cyan rectangle denotes the unit cell. b The optical image of a typical exfoliated TaSe2 thin film with thickness of 40 nm. The scale bar is 100 μm. c The schematic of the setup for transmission measurements. The yellow stripes represent TaSe2 ribbon arrays, T0 and T correspond to the transmission light of the bare diamond substrate and a ribbon array on the diamond substrate, respectively. d The extinction spectra 1−T/T0 for a plasmonic device (sample T1, d = 40 nm, W = 500 nm), the blue and gray solid lines correspond to the light polarization parallel (∥) and perpendicular (⊥) to the ribbon direction respectively. The red dashed line is the fitted curve of the plasmon peak. The first-order (P1) and the second-order (P2) plasmon peaks are denoted. The inset shows the scanning electron microscopy (SEM) image of the ribbon array.
