Fig. 7From: Structural Investigation of Uniform Ensembles of Self-Catalyzed GaAs Nanowires Fabricated by a Lithography-Free TechniqueMicro-photoluminescence spectra of samples NW1–NW3 in a–c, respectively. The used excitation power densities vary from 0.1 to 96 W cm−2 in a and b and in c from 1 to 960 W cm−2 Back to article page