Jung-Hoon Song, Qiang Zhang, W. Patterson, A. Nurmikko, M. Uren, K. Hilton, R. Balmer, T. Martin
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Optical detection of coherent GHz phonon generation in a high power GaN/AlGaN microwave FET
The time-varying electron density in the channel of a microwave GaN/AlGaN FET gives raise to GHz coherent phonon generation due to the screening of the giant piezoelectric fields, which we measure optically. Such propagating nonthermal channels of energy release may be of relevance to future high power devices.
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