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Proceedings Paper

Photoinduced optical dynamics of phase-change vanadium oxides
Author(s): Nardeep Kumar; Armando Rúa; Lee R. Chevres; Larry Theran; Brian Ayala; Félix E. Fernández; Sergiy Lysenko
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Paper Abstract

Using time- and angle-resolved hemispherical elastic light scattering technique we reveal complex pathways of photoinduced nonlinear optical dynamics in VO2, V2O3 and V3O5 thin films. The structural dynamics was monitored by using an ultrafast diffraction conoscopy technique. The evolution of phases in these correlated oxides is substantially different and significantly depends on optical excitation, temperature and size of grains and domains. Strong optical nonlinearity along with its complex transient dynamics makes vanadium oxides attractive for high-contrast all-optical switches, high-speed optical data storage and holographic devices. The characteristic time of optical nonlinearity can be tuned from several femtoseconds to picoseconds by altering the excitation fluence and size of grains and domains. Additional control of ultrafast phase transition dynamics can be achieved by photoacoustical generation of strain waves. Depending on material morphology and level of optical excitation, the optical signal shows coherent oscillations caused by photoacoustic wave at picosecond and nanosecond time scales. Complex nonlinear dynamics of correlated vanadium oxides can provide a way for precise tuning of transient optical and electronic properties in photonic devices.

Paper Details

Date Published: 24 August 2017
PDF: 10 pages
Proc. SPIE 10345, Active Photonic Platforms IX, 103451F (24 August 2017); doi: 10.1117/12.2274092
Show Author Affiliations
Nardeep Kumar, Univ. de Puerto Rico Mayagüez (United States)
Armando Rúa, Univ. de Puerto Rico Mayagüez (United States)
Lee R. Chevres, Univ. de Puerto Rico Mayagüez (United States)
Larry Theran, Univ. de Puerto Rico Mayagüez (United States)
Brian Ayala, Univ. de Puerto Rico Mayagüez (United States)
Félix E. Fernández, Univ. de Puerto Rico Mayagüez (United States)
Sergiy Lysenko, Univ. de Puerto Rico Mayagüez (United States)

Published in SPIE Proceedings Vol. 10345:
Active Photonic Platforms IX
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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