Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4983286
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Funding
- Research Council of Lithuania [LAT 04/2016]
- National Science Centre of Poland [DEC-2013/10/M/ST3/00705]
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We experimentally observed a terahertz (THz) radiation of electrically driven 2D electron gas (2DEG) plasmons in AlGaN/AlN/GaN structures at T = 110K. The grating with a period of 1.0 mu m and a filling factor of 0.35 was used to couple electromagnetic radiation out from the plasmonic sample excited in a pulsed regime. The peak power radiated from ungated 2DEG plasmons at a frequency of 5.0 THz under an electric field of 450 V/cm was up to 940 nW. The intensity of the radiation was sufficient to measure spectra with a conventional far-infrared Fourier transform spectrometer. The analysis of the data revealed that the 2DEG plasmon radiation was superimposed with the black-body radiation of the sample and electroluminescence of the impurities. The strategy to reach higher powers of THz emission for practical applications is discussed. Published by AIP Publishing.
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