Figure 2

Experimental and simulation extinction spectra of Au nanoarrays prepared by pulse AC and normal AC methods. (a, b) Experimental extinction spectra of the Au nanoarrays grown in AAO prepared using H₂SO₄ and H₂C₂O₄, respectively. (c) Simulation extinction spectra of the uniform and nonuniform Au nanoarrays with period a = 110 nm and diameter d = 34 nm. The length of the uniform nanoarray is set to be 150 nm. The simulation unit cell of the nonuniform nanoarray contains six nanowires with the length L = 50, 75, 100, 125, 150, and 200 nm.