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

I. Chatzakis, L. Luo, J. Wang, N. H. Shen, T. Koschny, J. Zhou, C. M. Soukoulis

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

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.

Original languageEnglish
Article number125110
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number12
DOIs
StatePublished - Sep 7 2012

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