期刊
JOURNAL OF SEMICONDUCTORS
卷 36, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-4926/36/10/104002
关键词
two-dimensional electron gas; hot electron; blackbody radiation; plasmon; Fabry-Perot cavity
资金
- National Basic Research Program of China [G2009CB929303]
- National Natural Science Foundation of China [61271157]
- China Postdoctoral Science Foundation [2014M551678]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1301054B]
The broadband terahertz (THz) emission from drifting two-dimensional electron gas (2DEG) in an AlGaN/ GaN heterostructure at 6 K is reported. The devices are designed as THz plasmon emitters according to the Smith-Purcell effect and the 'shallow water' plasma instability mechanism in 2DEG. Plasmon excitation is excluded since no signature of electron-density dependent plasmon mode is observed. Instead, the observed THz emission is found to come from the heated lattice and/or the hot electrons. Simulated emission spectra of hot electrons taking into account the THz absorption in air and Fabry-Perot interference agree well with the experiment. It is confirmed that a blackbody-like THz emission will inevitably be encountered in similar devices driven by a strong in-plane electric field. A conclusion is drawn that a more elaborate device design is required to achieve efficient plasmon excitation and THz emission.
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