Unraveling transient composition changes in plasmas for pulsed laser deposition

Description

The generation of coherent light pulses over wide spectral ranges, especially through nonlinear frequency conversion into to the UV, can provide powerful diagnostics for transient plasmas. In particular, these methods are suited to follow the propagation of plasma constituents on the nanosecond time scale and with micrometer resolution, while simultaneously unravel chemical processes. After excitation with coherent laser(like) light pulses, the plasma particles decay through collisions and emission of photons. From the uorescence (Laser Induced Fluorescence), the absolute particle densities and velocity (temperature) can be determined. In contrast to emission spectroscopy which only probes excited states, Laser Induced Fluorescence (LIF) provides direct access to the ground state populations of the plasma constituents. Monitoring plasmas for Pulsed Laser Deposition with LIF can be the key to a much deepened understanding of thin lm growth with atomic precision. We have developed a LIF spectroscopic setup that allows us to perform a spatio-temporal mapping of the species in the plasma plume propagating towards the substrate. This makes it possible to relate the plasma composition to the growth of thin lms on the substrate. In this presentation, I will discuss the concept of LIF and present recent results of LIF studies on plasmas relevant for the growth of thin films and multilayers of complex oxides.

Period	11 Mar 2014
Event title	26th NNV-Symposium Plasma Physics & Radiation Technology 2014
Event type	Conference
Conference number	26
Organiser	Nederlandse Natuurkundige Vereniging (NNV)
Location	Lunteren, NetherlandsShow on map
Degree of Recognition	International