Abstract
We demonstrate large nonlinear terahertz responses in the gaps of metamaterial split ring resonators in several materials and use nonlinear THz transmission and THz-pump/THz-probe spectroscopy to study the nonlinear responses and dynamics. We use the field enhancement in the SRR gaps to initiate high-field phenomena at lower incident fields. In vanadium dioxide, we drive the insulator-to-metal phase transition with high-field THz radiation. The film conductivity increases by over two orders of magnitude and the phase transition occurs on a several picosecond timescale. In gallium arsenide, we observe high-field transport phenomena, including mobility saturation and impact ionization. The carrier density increases by up to ten orders of magnitude at high fields. At the highest fields, we demonstrate THz-induced damage in both vanadium dioxide and gallium arsenide.
Original language | English (US) |
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Title of host publication | 18th International Conference on Ultrafast Phenomena, UP 2012 |
DOIs | |
State | Published - 2013 |
Event | 18th International Conference on Ultrafast Phenomena, UP 2012 - Lausanne, Switzerland Duration: Jul 8 2012 → Jul 13 2012 |
Publication series
Name | EPJ Web of Conferences |
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Volume | 41 |
ISSN (Print) | 2101-6275 |
ISSN (Electronic) | 2100-014X |
Other
Other | 18th International Conference on Ultrafast Phenomena, UP 2012 |
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Country | Switzerland |
City | Lausanne |
Period | 7/8/12 → 7/13/12 |
Bibliographical note
Copyright:Copyright 2013 Elsevier B.V., All rights reserved.