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Saturation of photoresponse to intense THz radiation in AlGaN/GaN HEMT detector

Dyakonova, N. ; Faltermeier, P. ; But, D. B. ; Coquillat, D. ; Ganichev, S. D. ; Knap, W. ; Szkudlarek, K. ; Cywinski, G.


We report on the photoresponse of AlGaN/GaN high electron mobility transistors to the THz radiation of low (15 mW/cm(2)) and high (up to 40 kW/cm(2)) intensities. We show that the response can be described by the Dyakonov-Shur theory in the whole range of radiation intensity. At low intensities, the photoresponse is linear in radiation intensity. Under intense laser radiation, we observe a ...


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