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