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SEM images of the self-organized PS spheres on a GaN substrate (a) and the enlarged view of monolayer region (b). The dashed circles mark the size imperfections of the PS spheres, which introduce point defects and stacking faults.
(a) 45° side view SEM images of ordered ZnO nanorod arrays and (b) a close-packed hexagonal ordering of ZnO nanorod arrays grown from a bilayer area of PS spheres. The inset is a top view of the rod arrays.
(Color online) (a) Low temperature (10 and ) PL spectra of ZnO nanorod arrays in the UV region under the excitation of HeCd laser at . (b) Details of the exciton emission in the near band edge region at . The inset shows the measurement configuration.
(Color online) (a) Emission spectra from a single nanorod pumped by femtosecond laser pulses at . The pump power is varied from about . The sample temperature is . The inset illustrates the measurement configuration. (b) The intensities of the , , and lasing peaks from the single nanorod as a function of excitation power.
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