Multiphoton absorption induced amplified spontaneous emission from biocatalyst-synthesized ZnO nanorods

Chunfeng Zhang, Fan Zhang, Shixiong Qian, Nitin Kumar, Jong In Hahm, Jian Xu

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27 Scopus citations

Abstract

Multiphoton absorption-induced photoluminescence and amplified spontaneous emission (ASE) have been observed from ZnO nanorod arrays upon near-infrared excitation (λexc ∼800 nm). A low threshold of ∼12 mJ/cm2 was demonstrated for the ASE process. The ultraviolet emission can be attributed to the recombination of carriers coexcited by the processes of three-photon and off-resonant two-photon absorption, which was confirmed by the excitation wavelength-dependent experiments. Additionally, it has been observed that the processes of ASE and second harmonic generation in ZnO nanorods appear to enhance each other when the excitation wavelength approaches the resonant wavelength for two-photon absorption.

Original languageEnglish (US)
Article number233116
JournalApplied Physics Letters
Volume92
Issue number23
DOIs
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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