Title :
Two-photon absorption and resonance enhancement of second harmonic in ZnO nanowires
Author :
Prasanth, R. ; van Vugt, L.K. ; Palero, Jonathan ; Gerritsen, H.C. ; Vanmaekelbergh, D.A.M.
Author_Institution :
Debye Inst., Utrecht Univ., Netherlands
Abstract :
ZnO nanowires are prepared using vapor-liquid-solid process. Two-photon absorption measurement has been carried out using femtosecond laser pulses ranging from 700-800 nm. In addition to the deep-level green emission around 530 nm due to the surface defect and the near band-edge ultraviolet emission around 360 nm due to the exciton, a second harmonic peak has been observed. The strength of the frequency-doubled component is enhancing while tuning the two-photon absorption wavelength towards the exciton wavelength of the nanowires, due to resonant exciton absorption.
Keywords :
II-VI semiconductors; excitons; high-speed optical techniques; nanowires; optical harmonic generation; two-photon processes; wide band gap semiconductors; zinc compounds; 360 nm; 530 nm; 700 to 800 nm; ZnO; ZnO nanowires; deep-level green emission; exciton; femtosecond laser pulses; frequency doubling; near band-edge ultraviolet emission; resonance enhancement; resonant exciton absorption; second harmonic; surface defect; two-photon absorption; vapor-liquid-solid process; Absorption; Crystalline materials; Excitons; Nanowires; Nonlinear optics; Optical materials; Photoconducting materials; Resonance; Ultrafast optics; Zinc oxide;
Conference_Titel :
Nanotechnology, 2005. 5th IEEE Conference on
Print_ISBN :
0-7803-9199-3
DOI :
10.1109/NANO.2005.1500643
