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Autori: V. Agarwal, J. A. del Río, G. Malpuech, M. Zamfirescu, A. Kavokin, D. Coquillat, D. Scalbert, M. Vladimirova, and B. Gil
Editorial: Phys. Rev. Lett., 92, p.97401, 2004.
We report the first observation of oscillations of the electromagnetic field in an optical superlattice based on porous silicon. These oscillations are an optical equivalent of well-known electronic Bloch
oscillations in crystals. Elementary cells of our structure are composed by microcavities whose
coupling gives rise to the extended collective modes forming optical minigaps and minibands. By
varying thicknesses of the cavities along the structure axis, we have created an effective electric field
for photons. A very high quality factor of the confined optical state of the Wannier-Stark ladder may
allow lasing in porous silicon-based superlattices.
Cuvinte cheie: optical superlattices, porous silicon, photon Bloch oscillations