Electrically driven nanoscale acoustic source based on a two-dimensional electron gas
Acoustic emission by a modulated two-dimensional electron gas (2DEG) is studied
analytically, numerically, and experimentally. Optical reflectance measurements provide the
full acoustic spectrum emitted by a modulated GaN-based 2DEG, including various surface
acoustic wave (SAW) modes that propagate with different polarizations and penetration
depths within the epitaxial layer structure. A 2DEG is shown to provide a source of SAWs
that is several orders of magnitude more intense than an interdigital transducer (IDT) of the …
analytically, numerically, and experimentally. Optical reflectance measurements provide the
full acoustic spectrum emitted by a modulated GaN-based 2DEG, including various surface
acoustic wave (SAW) modes that propagate with different polarizations and penetration
depths within the epitaxial layer structure. A 2DEG is shown to provide a source of SAWs
that is several orders of magnitude more intense than an interdigital transducer (IDT) of the …
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