Fig. 3: Energy-filtered TEM images of the finite grating structure at a Bi2Se3 edge.
From: Interaction of edge exciton polaritons with engineered defects in the hyperbolic material Bi2Se3
a Schematic of the finite grating structure, consisting of round-shaped grooves. The investigated area is marked by a red frame. b EFTEM images at different energy-losses (3 and 4 eV) acquired with an energy window of 0.2 eV width. The intensity variation indicates the relative local absorption probability. Big and small blue arrows point towards intensity maxima and minima, respectively, which are referred to in the main text. c Intensity modulation along the structured edge for different energy-loss values as indicated within the figure. The analyzed spectra were extracted from positions marked in (d) with numbers and averaged spatially over an area of 10 × 10 pixels. Gray shaded areas in (c) emphasize the positions of the bridges between grooves.
