提出一种基于电场驱动的 GaAs基微带超晶格高阶谐波产生的太赫兹倍频器, 利用平衡方程方法分析了倍频器在磁场下峰值功率输出和在参数空间(Edc,Eac)的分布情况。研究表明, 在 (Edc,Eac)的参数平面内, 磁场对二次和三次谐波功率的峰值影响不大, 但磁场会拓宽谐波输出功率的峰值区域, 提高在 (Edc,Eac)参数空间内输出峰值功率的概率。当 Eac确定时, 谐波发射功率峰值的位置会受到直流电场产生的布洛赫振荡频率 fB、交流电场产生的调制布洛赫振荡频率 fMB和磁场引起的回旋振荡频率 fc的影响而发生变化。研究表明, 基于半导体超晶格的太赫兹倍频器是很有应用潜力的太赫兹波发生器件。

Terahertz frequency multiplier based on high-order harmonic generation of GaAs-based miniband superlattices is studied by using balance equation approach. With the presence of magnetic field, the peak power output of the frequency multiplier and its distribution in the parameter space (Edc, Eac) are carefully analyzed. The study shows that in the parameter plane of (Edc, Eac), the magnetic field has little influence on the peak size of the second and third harmonic of output power, but the magnetic field will broaden the peak area of the harmonic output power, which can improve the probability of output peak power in the parameter space of (Edc, Eac). When Eac is determined, the position of the peak harmonic emission power will be affected by the Bloch oscillation frequency fB generated by the DC electric field, the modulated Bloch oscillation frequency fMB generated by the AC electric field, and the cyclotron oscillation frequency fc caused by the magnetic field. The results indicate that the THz frequency multiplier based on semiconductor superlattice is a potential THz wave generator.