Field-effect Self-mixing Terahertz Detectors

Jiandong Sun's research focuses on exploring terahertz detectors and sources based on low-dimensional plasma wave. In his Ph. D thesis, he developed high-sensitivity terahertz detectors based on the self-mixing effect in gate-controlled two-dimensional electron systems at room temperature. Terahertz antennas and Schottky gates are integrated with the two-dimensional electron gas for manipulating both the localized terahertz field and the field-effect electron channel. The underlying self-mixing properties are uncovered through the transport measurement and simulations. The device model and the characterization techniques he developed in the thesis could be applied for further detector optimization for future real applications. honors: 1) American Superconductor Corp (AMSC) Award (2012). 2) Nominated by Chinese Academy of Sciences for an outstanding Ph.D. thesis (2013) 3) Honor roll student of Chinese Academy of Sciences (2010) 4) Honor roll student of Chinese Academy of Sciences (2011) Publications: [1] J. D. Sun, Y. F. Sun, D. M. Wu, Y. Cai, H. Qin and B. S. Zhang. Highresponsivity, low-noise, room-temperature, self-mixing terahertz detector realized using floating antennas on a GaN-based field-effect transistor, Appl. Phys. Lett. 100, 013506 (2012). [2] J. D. Sun, H. Qin, R. A. Lewis, Y. F. Sun, X. Y. Zhang, Y. Cai, D. M. Wu, and B. S. Zhang. Probing of localized terahertz self-mixing in a GaN/AlGaN field-effect transistor, Appl. Phys. Lett. 100, 173513 (2012). [3] Y. F. Sun, J. D. Sun, Y. Zhou, R. B. Tan, C. H. Zeng, W. Xue, H. Qin, B. S. Zhang, and D. M. Wu. Room temperature GaN/AlGaN self-mixing terahertz detector enhanced by resonant antennas, Appl. Phys. Lett. 98, 252103 (2011). [4] J. D. Sun, Y. F. Sun, Y. Zhou, Z. P. Zhang, W. K. Lin, C. H. Zen, D. M. Wu, B. S. Zhang, H.Qin. A Terahertz detector Based on GaN/AlGaN High Electron Mobility Transistor with Bowtie, AIP Conf. Proc , 1399, 893 (2011); 30th International Conference on the Physics of Semiconductors (ICPS) 2010 [5] R. B. Tan, H. Qin, J. D. Sun, X. Y. Zhang, and B. S. Zhang. Modeling an antenna-coupled graphene field-effect terahertz detector. Appl. Phys. Lett. 103, 173507 (2013)

• Introduction.- Field-Effect Self-Mixing Mechanism and Detector Model.- Realization of Terahertz Self-Mixing Detectors Based on AlGaN/GaN HEMT.- Realization of Resonant Plasmon Excitation and Detection.- Scanning Near-Field Probe for Antenna Characterization.- Applications.- Conclusions and Outlook.