Pages- Terahertz Imaging & Detection

Wednesday, September 12, 2012

Abstract-Reversible modulation and ultrafast dynamics of terahertz resonances in strongly photoexcited metamaterials



http://prb.aps.org/abstract/PRB/v86/i12/e125110

I. Chatzakis1L. Luo1J. Wang1,*N.-H. Shen1,†T. Koschny1J. Zhou2,‡, and C. M. Soukoulis1,3
1Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
2Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
3Institute of Electronic Structure and Laser, FORTH, 71110 Heraklion, Crete, Greece
Received 24 December 2011; revised 30 July 2012; published 7 September 2012
We demonstrate an ultrafast reversible modulation of resonant terahertz (THz) response in strongly photoexcited metamaterials. The transient spectral-temporal response of the dipole transition ∼1.6 THz exhibits a distinct nonmonotonic variation as a function of pump fluence. The transition energy shift, strength, spectral width, and density-dependent ultrafast relaxation manifest a remarkable reemergence of the transmission dip after initial quenching. Our simulations, incorporating the first-order diffraction from the photoinduced transient grating, reproduce the salient features, providing a new avenue for designing nonlinear and frequency-agile THz modulators.
©2012 American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevB.86.125110
DOI:
10.1103/PhysRevB.86.125110
PACS:
78.67.Pt, 42.25.Bs, 78.20.-e, 78.47.-p

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