Metamaterial-Enhanced Nonlinear Terahertz Spectroscopy

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

Research output: Contribution to journalConference articleResearchpeer-review


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
Article number09005
JournalE P J Web of Conferences
Number of pages3
Publication statusPublished - 2013
Externally publishedYes
Event18th International Conference on Ultrafast Phenomena (UP 2012) - Lausanne, Switzerland
Duration: 8 Jul 201213 Jul 2012


Conference18th International Conference on Ultrafast Phenomena (UP 2012)
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