Metamaterial-Enhanced Nonlinear Terahertz Spectroscopy
| Autor: | Andrew C. Strikwerda, Harold Y. Hwang, Richard D. Averitt, Aaron Sternbach, Jingdi Zhang, Xin Zhang, Kebin Fan, Nathaniel C. Brandt, Bradford G. Perkins, Mengkun Liu, Keith A. Nelson |
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| Přispěvatelé: | Massachusetts Institute of Technology. Department of Chemistry, Hwang, Harold Young, Perkins Jr, Bradford G., Nelson, Keith Adam |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Terahertz radiation business.industry Physics QC1-999 Metamaterial Physics::Optics Nanotechnology Terahertz spectroscopy and technology Gallium arsenide Split-ring resonator chemistry.chemical_compound Impact ionization Condensed Matter::Materials Science chemistry Picosecond Optoelectronics business Order of magnitude |
| Zdroj: | EPJ Web of Conferences EPJ Web of Conferences, Vol 41, p 09005 (2013) |
| Popis: | 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. United States. Dept. of Energy (DOE-BES, grant DE-FG02- 09ER46643) United States. Office of Naval Research (ONR Grant No. N00014-09-1-1103) |
| Databáze: | OpenAIRE |
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