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Opportunity at Davies Teaching Fellowships (ARL/USMA)

In Situ Characterization of Novel, Pulsed Laser Deposited Thin Films

Location

Weapons and Materials Research Directorate-FFP, Surface Science - FFP

RO# Location
AA.30.08.B3183 Aberdeen Proving Ground, MD 210055066

Advisers

Name E-mail Phone
Sausa, Rosario C rosario.c.sausa.civ@mail.mil 410.306.0660

Description

This research centers on the use of laser-induced fluorescence (LIF) and associated techniques to understand the pulsed laser deposition process and to establish a plume chemistry data base, which will facilitate the deposition of a variety of novel thin films with greater reproducibility. Films of interest include high-temperature superconductors, ferroelectrics, and protective coatings.

A pulsed laser is used to ablate the target of interest, and the ejected material is deposited on a heated substrate. We study the surface ablation, nucleation, and growth mechanisms by varying the laser wavelength, pulse energy, ablation spot size, repetition rate, and chamber pressure. A second laser, which is time delayed from the ablation laser, is then used to probe the important chemical intermediates in the plume by LIF and stimulated emission. We also use emission spectroscopy to identify electronically excited species. Ex situ thin-film characterization is performed by profilometry, atomic force microscopy, and x-ray diffraction. Available equipment includes several excimer lasers, Nd:YAG laser-pumped dye laser systems, deposition chambers, computer interfaced data acquisition and analysis systems, assorted detectors, electronics and electro-optics, and equipment for analyzing the deposited films.

Proposals are also welcome that focus on numerical modeling of the experimental data using detailed chemical mechanisms.

 

Keywords:
Laser-induced fluorescence; Pulsed lasers; Thin films; High-temperature superconductors; Ferroelectricity; Coatings; Laser ablation;

Eligibility

Citizenship:  Open to U.S. citizens
Level:  Open to Postdoctoral applicants
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