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14 March 2016 Electro-phononics for modulating acoustic pulses
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Abstract
The combined applications of vertical and lateral electric fields give rise to a novel degree of freedom in controlling transverse acoustic (TA) and longitudinal acoustic (LA) phonons. The coherent acoustic pulses were generated in GaN-based quantum wells (QWs) along polar c-axis under the ultrafast optical screening of the field-dependent strains and measured via the dynamic interference between reflected optical beams off the surface and the acoustic pulses. We electrically turned on the otherwise forbidden TA mode in the laterally biased region. The frequencies of the modes could be also modified via the field-induced changes in the propagation velocities. Finally, we experimentally investigated a novel method of controlling the phase of LA mode, generated from oppositely strained quantum wells and barriers under the vertical electric field.
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Young-Dahl Jho and Hoonill Jeong "Electro-phononics for modulating acoustic pulses", Proc. SPIE 9746, Ultrafast Phenomena and Nanophotonics XX, 97461K (14 March 2016); https://doi.org/10.1117/12.2211600
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