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

Details Reversible modulation and ultrafast dynamics of THz resonances in strongly photoexcited metamaterials Reversible modulation and ultrafast dynamics of THz resonances in strongly photoexcited metamaterials

2011-12-29

arxiv.org/abs/1112.6337v1

Physics

Condensed Matter

Materials Science

Scientific paper

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 non-monotonic variation as a function of pump fluence. The transition energy shift, strength, spectral width and density-dependent ultrafast relaxation manifest a remarkable re-emergence of the resonances after initial quenching. Our simulation, incorporating the first-order diffraction from the photoinduced transient grating, reproduces the salient features, providing a new avenue for designing nonlinear and frequency-agile THz modulators.

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