Broadband terahertz generation from metamaterials

Liang Luo, Ioannis Chatzakis, Jigang Wang (), Fabian B. P. Niesler, Martin Wegener, Thomas Koschny and Costas M. Soukoulis ()
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Liang Luo: Iowa State University
Ioannis Chatzakis: Iowa State University
Jigang Wang: Iowa State University
Fabian B. P. Niesler: Institute of Applied Physics, Institute of Nanotechnology and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT)
Martin Wegener: Institute of Applied Physics, Institute of Nanotechnology and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT)
Thomas Koschny: Iowa State University
Costas M. Soukoulis: Iowa State University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract 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.

Date: 2014
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DOI: 10.1038/ncomms4055

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