We experimentally demonstrate efficient switching of the hard x-ray Bragg reflectivity of a superlattice by optical excitation of large-amplitude coherent acoustic superlattice phonons. The rocking curve changes drastically on a 1 ps timescale. The (0 0 116) reflection is almost extinguished , while the (0 0 118) reflection increases by more than an order of magnitude . The change of the x-ray structure factor depends nonlinearly on the phonon amplitude, allowing manipulation of the x-ray response on a timescale considerably shorter than the phonon period. Numerical simulations for a superlattice with slightly changed geometry and realistic parameters predict a switching-contrast ratio of 700 with high reflectivity.
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The assumption of perfect interfaces in the simulation, i.e., no intermixing, is not crucial. The presence of three intermixed unit cells would diminish the switching ratio by less than a factor of 2 with almost unchanged maximum reflectivity.
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American Institute of Physics
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