2026-04-13T02:19:17Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1319582025-12-04T21:32:23Zcom_2072_1057col_2072_478812col_2072_478917
RECERCAT
author
Hyyti, Janne
author
Perestjuk, Marko
author
Mahler, Felix
author
Grunwald, Rüdiger
author
Güell Vilà, Frank
author
Gray, Ciarán
author
McGlynn, Enda
author
Steinmeyer, Günter
2019-04-10T11:25:15Z2019-04-10T11:25:15Z2018-02-192019-04-10T11:25:15Z
The near-ultraviolet photoluminescence of ZnO nanorods induced by multiphoton absorption of unamplified Ti:sapphire pulses is investigated. Power dependence measurements have been conducted with an adaptation of the ultrashort pulse characterization method of interferometric frequency-resolved optical gating. These measurements enable the separation of second harmonic and photoluminescence bands due to their distinct coherence properties. A detailed analysis yields fractional power dependence exponents in the range of 3-4, indicating the presence of multiple nonlinear processes. The range in measured exponents is attributed to differences in local field enhancement, which is supported by independent photoluminescence and structural measurements. Simulations based on Keldysh theory suggest contributions by three- and four-photon absorption as well as avalanche ionization in agreement with experimental findings.
(c) Institute of Physics (IOP), 2018 info:eu-repo/semantics/openAccess
Nanoestructures
Luminescència
Mesuraments òptics
Nanostructures
Luminescence
Optical measurements
Field Enhancement of Multiphoton Induced Luminescence Processes in ZnO Nanorods
info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion