Figure 1
From: Integrated colloidal quantum dot photodetectors with color-tunable plasmonic nanofocusing lenses
(a) Scanning electron micrograph of a bull's eye structure. The PbS quantum dots in the center and the contact arms at the left and right are indicated. The inset shows a tilted-view scanning electron micrograph highlighting the infiltration of the quantum dots between the Au triangles. (b) 3D atomic force micrograph of the bull's eye structure. The inset shows a line profile collected along the black dashed line indicated in the 3D image. (c) Schematic illustration of the bull's eye structure, on which are indicated the definitions of the groove depth (s), groove width (w), pitch (p), gold thickness (TAu), PbS thickness (TPbS) and PbS diameter (dPbS). (d and e) Scanning electron micrographs of the large reference (d) and the small reference (e). 3D, three-dimensional.
