Kampfrath, Tobias; Beggs, Daryl M.; White, Thomas; Melloni, A.; Krauss, Thomas F; Kuipers, L (Kobus)
We demonstrate by experiment and theory that a light pulse propagating through a Si-based photonic-crystal waveguide is adiabatically blueshifted when the refractive index of the Si is reduced on a femtosecond time scale. Thanks to the use of slow-light modes, we are able to shift a 1.3-ps pulse at telecom frequencies by 0.3 THz with an efficiency as high as 80% in a waveguide as short as 19μm. An analytic theory reproduces the experimental data excellently, which shows that adiabatic dynamics...[Show more]
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