Journal article
Metamaterial-Enhanced Nonlinear Terahertz Spectroscopy
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.
Language: | Undetermined |
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Publisher: | EDP Sciences |
Year: | 2013 |
Pages: | 09005 |
ISSN: | 2100014x and 21016275 |
Types: | Journal article |
DOI: | 10.1051/epjconf/20134109005 |