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SEM image of the ZnO microtubes fabricated by the hydrothermal method.
(Color online) (a) PL spectra from ZnO microtubes excited by Xe lamp via single photon absorption at wavelength of and multiphoton absorption processes using nanosecond laser pulses at and femtosecond pulses at , respectively. (b) Emission spectra from ZnO microtubes excited by femtosecond pulses at different wavelengths. The excitation fluence of the femtosecond pulses is fixed at .
(Color online) (a) Multiphoton absorption induced PL spectra from ZnO microtubes excited by femtosecond laser with different pumping fluences. (b) Emission intensity at 388 and and SHG peak vs the excitation fluence. Inset shows a schematic diagram of ZnO microtube cavity formed by the sidewalls ( and are the reflectivities at the ZnO/silicon and ZnO/air interfaces, respectively). Light emission was collected in the direction normal to the substrate.
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