Electrically driven nanoscale acoustic source based on a two-dimensional electron gas

被引：8

作者：

Shao, Lei ^{[1
]}

Zhang, Meng ^{[1
]}

Banerjee, Animesh ^{[1
]}

Bhattacharya, Pallab K. ^{[1
]}

Pipe, Kevin P. ^{[1
]}

机构：

[1] Univ Michigan, Ann Arbor, MI 48109 USA

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 08期

关键词：

FIELD-EFFECT TRANSISTORS; FILMS; HETEROSTRUCTURES; GENERATION; SAPPHIRE; STRAIN; WAVES; LASER;

D O I：

10.1063/1.4818550

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 same chip area. Furthermore, a 2DEG SAW source is shown to have the ability to switch between different acoustic modes based on applied DC bias conditions. (C) 2013 AIP Publishing LLC.

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页数：5

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