Effects of the piezoelectric field on the modulation of excitonpolaritons by surface acoustic waves
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Surface acoustic waves (SAWs) provide a powerful tool for the modulation of polaritons in GaAs-based microcavities. In this contribution, we compare the modulation introduced by SAWs propagating along piezoelectric and non-piezoelectric crystal directions of the sample surface. Strain calculations reveal that the type-I band-gap modulation induced by the strain field is comparable for both SAW types. Piezoelectric SAWs have, however, an intrinsic longitudinal electric field, which can dissociate quantum well (QW) excitons and, thus, degrade the modulation. Images of the polariton far-field photoluminescence reveal this behavior for different excitation conditions. © 2010 Elsevier Ltd. All rights reserved.
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Microcavity polaritons; Surface acoustic waves Bandgap modulation; Excitation conditions; Exciton polaritons; Far-field; GaAs; Micro-cavity polaritons; Piezo-electric fields; Piezoelectric crystals; Polaritons; Quantum well; Sample surface; Strain fields; Surface acoustic waves; Acoustic surface wave devices; Acoustics; Acoustoelectric effects; Cutting; Electric fields; Microcavities; Modulation; Phonons; Photons; Piezoelectricity; Quantum theory; Semiconductor quantum wells; Solids; Acoustic waves
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