2026-04-17T16:07:06Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1319582025-12-04T21:32:23Zcom_2072_1057col_2072_478812col_2072_478917

00925njm 22002777a 4500 dc Hyyti, Janne author Perestjuk, Marko author Mahler, Felix author Grunwald, Rüdiger author Güell Vilà, Frank author Gray, Ciarán author McGlynn, Enda author Steinmeyer, Günter author 2019-04-10T11:25:15Z 2019-04-10T11:25:15Z 2018-02-19 2019-04-10T11:25:15Z 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. Nanoestructures Luminescència Mesuraments òptics Nanostructures Luminescence Optical measurements Field Enhancement of Multiphoton Induced Luminescence Processes in ZnO Nanorods