Fig. 1
From: Giant Tunable Circular Dichroism of Large-Area Extrinsic Chiral Metal Nanocrescent Arrays
a Sketch of crescent preparation process and the particle geometry indicating the diameter dcoll of masking colloid and the maximum crescent width w of the metal. The red arrow indicates positive direction of the mirror axis of nanocrescents; b–d SEM images of the structure with lattice constants: b 500 nm, c 800 nm, d 1000 nm. The length of the green arrow represents the maximum width of the crescent-shaped structure w. The dotted line represents the diameter of the crescent structure after fitting with a circle (etched PS nanospheres); e The reciprocal lattice is spanned by the basis vectors (1, 0) and (0, 1). The reciprocal vector (1, 1) and (2, 1) are shown. The continuous and dashed lines in the diagram of the reciprocal lattice represent the boundaries of the first and the second Brillouin zones, respectively. f Schematic design of the experiment