Broadband terahertz generation from metamaterials

Liang Luo, Ioannis Chatzakis, Jigang Wang, Fabian B.P. Niesler, Martin Wegener, Thomas Koschny, Costas M. Soukoulis

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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 μm (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 ∼10-16 m2 V-1 that far exceeds thin films and bulk non-centrosymmetric materials.

Original languageEnglish
Article number3055
JournalNature Communications
StatePublished - Jan 8 2014

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    Luo, L., Chatzakis, I., Wang, J., Niesler, F. B. P., Wegener, M., Koschny, T., & Soukoulis, C. M. (2014). Broadband terahertz generation from metamaterials. Nature Communications, 5, [3055].