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 |
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Article number | 09005 |
Journal | E P J Web of Conferences |
Volume | 41 |
Number of pages | 3 |
ISSN | 2100-014X |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Event | 18th International Conference on Ultrafast Phenomena (UP 2012) - Lausanne, Switzerland Duration: 8 Jul 2012 → 13 Jul 2012 http://www.up2012.org/ |
Conference
Conference | 18th International Conference on Ultrafast Phenomena (UP 2012) |
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Country/Territory | Switzerland |
City | Lausanne |
Period | 08/07/2012 → 13/07/2012 |
Internet address |