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

TitleReversible modulation and ultrafast dynamics of terahertz resonances in strongly photoexcited metamaterials
Publication TypeJournal Article
Year of Publication2012
AuthorsChatzakis I, Luo L, Wang J, Shen NH, Koschny T, Zhou J, Soukoulis CM
Journal TitlePhysical Review B
Volume86
Pages125110
Date Published09
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000308460200002
Keywordsnegative-index metamaterials, refractive-index
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 similar to 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.
URL<Go to ISI>://WOS:000308460200002
DOI10.1103/PhysRevB.86.125110
Alternate JournalPhys. Rev. B