Metamaterial-enhanced nonlinear terahertz spectroscopy

H. Y. Hwang, M. Liu, K. Fan, J. Zhang, A. C. Strikwerda, A. Sternbach, N. C. Brandt, B. G. Perkins, X. Zhang, R. D. Averitt, K. A. Nelson

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 languageEnglish (US)
Title of host publication18th International Conference on Ultrafast Phenomena, UP 2012
StatePublished - 2013
Externally publishedYes
Event18th International Conference on Ultrafast Phenomena, UP 2012 - Lausanne, Switzerland
Duration: Jul 8 2012Jul 13 2012

Publication series

NameEPJ Web of Conferences
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X


Other18th International Conference on Ultrafast Phenomena, UP 2012


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