Preface
The editorial office would extend great appreciation to Prof. Liu Fengqi for his great support to this issue.
As an invited guest editor of TST, he has brought readers two interesting invited papers: one is on an antenna integrated, waveguide-fed, traveling-wave uni-traveling carrier photodiodes. Measurement results show that broad band THz emission can be obtained. Another one is research on the Dual-mode AlGaInAs/InP square microlasers for terahertz generation，which is a novel architecture for the THz wave generation.
Editorial Office of TST
September 30, 2017
TST, Vol. 10, No. 3, PP. 71-76
(Invited paper) Fabrication of antenna integrated UTC-PDs as THz sources
Siwei Sun 1, Tengyun Wang 2, Xiao xie 1, Lichen Zhang 1, Yuan Yao 2 and Song Liang 1*
1 Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences，and College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing 100083, China.
2 School of Electronic Engineering, Bejing University of Posts and Telecommunications, P.R. China
* Email: liangsong@semi.ac.cn
(Received 20 Auguest 2017)
Abstract: We report the design, fabrication and characterization of an antenna integrated, waveguide-fed, traveling-wave uni-traveling carrier photodiodes (TW-UTC-PDs). In the device, a dilute passive waveguide structure, which is easy to be coupled with a single mode fiber, is adopted. Measurement results show that broad band THz emission can be obtained for frequencies up to 700 GHz.
Keywords: Terahertz source, UTC-PD, Antenna
doi: 10.11906/TST.071-076.2017.09.05
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TST, Vol. 10, No. 3, PP. 77-86
(Invited paper) Dual-mode AlGaInAs/InP square microlasers for terahertz generation
Yue-De Yang, Hai-Zhong Weng, Jin-Long Xiao, and Yong-Zhen Huang *
State Key Laboratory on Integrated Optoelectronics,
Institute of Semiconductors & University of Chinese Academy of Sciences,
Chinese Academy of Sciences, Beijing 100083, China
* Email: yzhuang@semi.ac.cn
(Received 25 September 2017)
Abstract: Dual-transverse-mode AlGaInAs/InP square microlasers with the frequency intervals in the range from several GHz to sub-THz are demonstrated. A sub-THz signal of 103.2 GHz is successfully obtained with a uni-traveling-carrier photodiode. For extending the frequency range to THz, deformed square microlasers with the flat sidewalls replaced by circular-arcs are proposed. An increase of mode interval and an enhancement of mode quality factor are realized simultaneously according to numerical simulation results. Furthermore, the stability of dual-mode lasing is verified by a nonlinear gain analysis based on the simulated mode field distributions. For the AlGaInAs/InP deformed square microlasers, beating signals with the frequencies of 0.43, 0.31, and 0.16 THz are demonstrated by an autocorrelation measurement, which indicate the microlasers as a novel architecture for the THz wave generation.
Keywords: Dual-mode lasing, Square microlaser, Optical heterodyne, Terahertz wave
doi: 10.11906/TST.077-086.2017.09.06
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