期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms4055
关键词
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资金
- US Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering
- US Department of Energy [DE-AC02-07CH11358]
- US Office of Naval Research [N00014-10-1-0925]
- National Science Foundation [DMR-1055352]
- DFG
- State of Baden-Wurttemberg
- Karlsruhe Institute of Technology (KIT) through the DFG-Center for Functional Nanostructures (CFN)
The terahertz spectral regime, ranging from about 0.1-15 THz, is one of the least explored yet most technologically transformative spectral regions. One current challenge is to develop efficient and compact terahertz emitters/detectors with a broadband and gapless spectrum that can be tailored for various pump photon energies. Here we demonstrate efficient single-cycle broadband THz generation, ranging from about 0.1-4 THz, from a thin layer of split-ring resonators with few tens of nanometers thickness by pumping at the telecommunications wavelength of 1.5 mm (200 THz). The terahertz emission arises from exciting the magnetic-dipole resonance of the split-ring resonators and quickly decreases under off-resonance pumping. This, together with pump polarization dependence and power scaling of the terahertz emission, identifies the role of optically induced nonlinear currents in split-ring resonators. We also reveal a giant sheet nonlinear susceptibility similar to 10(-16) m(2) V-1 that far exceeds thin films and bulk non-centrosymmetric materials.
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