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Structure and Transport Properties in Terahertz Quantum Cascade Laser

Author: LuJun
Tutor: LiYuXian
School: Hebei Normal
Course: Condensed Matter Physics
Keywords: Terahertz quantum cascade lasers Electron transport Resonant tunneling Transmission coefficient Energy level
CLC: TN248
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 0
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Abstract


Terahertz (THz) quantum cascade laser (QCL) is an important terahertz radiation source , with a small, lightweight , easily integrated , adjustable frequency and energy conversion efficiency . In this thesis, the transport properties of terahertz quantum cascade laser (THz QCL) , design by the transport properties THz QCL with optical phonon scattering . First, using the transfer matrix method of derivation of the Al 0 .3 < / sub> Ga 0.7 As / GaAs / Al 0 .3 < / sub > Ga 0.7 < / sub> As the transmission coefficient of the double - barrier single- well structure , and to draw a quasi- bound state in the case . And thereby calculating the change of the width of the second barrier , the relationship between the field intensity and the energy level . The calculation results show that the barrier width, well width , the bias of the system transmission coefficients have a very significant impact . Fixed first barrier width , change the second barrier width , the system ground state level and the first excited state energy levels were not influenced by the change of the barrier width . Then this paper, the third base in the double- well structure , the middle well width for the coupling between the well and the well . With the gradual decrease of the intermediate well width , the coupling effect between the adjacent wells and the well gradually strengthened. THz QCL transport properties , and design a THz QCL with optical phonon scattering . Simulate the distribution of the wave function and energy level position . For the design of the structure , the analog wave function of a high energy level of the emitter region wave function and low power level to be able to overlap ; emission wavelength 147.6 ( μm ), the frequency 2.03 (THz), belonging to the terahertz ; extraction zone emitting electromagnetic energy 26.9 (MeV) considerable energy and lattice optical phonons . This facilitates inversion, increase terahertz emission intensity .

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