共振声子THz QCL有源区结构设计

利用Airy函数代换与传输矩阵方法精确计算了有外加偏压下电子在共振声子太赫兹量子级联激光器有源区单个周期内的透射系数与波函数,得到了不同偏压下的电子波函数分布以及准束缚态能级位置与外加偏压的关系曲线.在仿真计算的基础上设计了一种共振声子太赫兹量子级联激光器的有源区结构.计算结果表明,对于设计的结构,当单个周期两端的外加...

Structural Design of the Active Region in Resonant-Phonon Terahertz Quantum Cascade Lasers

The transmission coefficients and wave function of the electron in the single period(SP) of the resonant phonon(RP) terahertz quantum cascade laser active region were calculated with the bias voltage by Airy function formulism and transmission matrix methods.The electron wave function with different bias voltages and relationship curve of the quasi-bound level(sub-band) and bias voltage were gotten.Based on the simulation calculation results,an active region structure of the RP THz QCL was designed.The calculation results show that the THz lasing appears when the bias voltage of two terminals in the SP structure is 45 mV.The wave function overlap between E3 and E2 appears in the radiation region.The related lasing wave is within THz range,the wavelength is 98.0 μm and the frequency is 3.05 THz.The transition energy from E2 to E1 in the relaxation region is 36.0 meV,the same as the longitudinal optical(LO) phonon energy(36 meV in GaAs).It is beneficial to achieve large population inversion.