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Numerical study on THz radiation of two-dimensional plasmon resonance of GaN HEMT array |
| Hongyang Guo(郭宏阳), Ping Zhang(张平), Shengpeng Yang(杨生鹏), Shaomeng Wang(王少萌), and Yubin Gong(宫玉彬)† |
| National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610031, China |
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Abstract The GaN high electron mobility transistor (HEMT) has been considered as a potential terahertz (THz) radiation source, yet the low radiation power level restricts their applications. The HEMT array is thought to improve the coupling efficiency between two-dimensional (2D) plasmons and THz radiation. In this work, we investigate the plasma oscillation, electromagnetic radiation, and the integration characteristics of GaN HEMT targeting at a high THz radiation power source. The quantitative radiation power and directivity are obtained for integrated GaN HEMT array with different array periods and element numbers. With the same initial plasma oscillation phase among the HEMT units, the radiation power of the two-element HEMT array can achieve 4 times as the single HEMT radiation power when the array period is shorter than 1/8 electromagnetic wavelength. In addition, the radiation power of the HEMT array varies almost linearly with the element number, the smaller array period can lead to the greater radiation power. It shows that increasing the array period could narrow the main radiated lobe width while weaken the radiation power. Increasing the element number can improve both the radiation directivity and power. We also synchronize the plasma wave phases in the HEMT array by adopting an external Gaussian plane wave with central frequency the same as the plasmon resonant frequency, which solves the problem of the radiation power reduction caused by the asynchronous plasma oscillation phases among the elements. The study of the radiation power amplification of the one-dimensional (1D) GaN HEMT array provides useful guidance for the research of compact high-power solid-state terahertz sources.
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Received: 04 November 2022
Revised: 26 December 2022
Accepted manuscript online: 06 January 2023
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PACS:
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07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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42.72.Ai
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(Infrared sources)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 92163204, 61921002, and 62171098). |
Corresponding Authors:
Yubin Gong
E-mail: ybgong@uestc.edu.cn
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Cite this article:
Hongyang Guo(郭宏阳), Ping Zhang(张平), Shengpeng Yang(杨生鹏), Shaomeng Wang(王少萌), and Yubin Gong(宫玉彬) Numerical study on THz radiation of two-dimensional plasmon resonance of GaN HEMT array 2023 Chin. Phys. B 32 040701
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