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<p>In the quest for high-performance terahertz (THz) quantum cascade lasers (QCLs), this study introduces a generalized wavefunction engineering approach to efficiently control state populations at elevated temperatures. Analyzing known two-well structures and their limitations, a three-well QCL design based on a direct depopulation scheme is proposed. Employing a combination of rate equations-density matrix and NEGF modelings, our design achieves superior performance at 290 K by simultaneously optimizing injection coupling, thermal back-filling, and electron escape rates from upper and lower lasing states to parasitic states.</p>

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Wavefunction engineering towards high-performance terahertz quantum cascade lasers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月11日

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  • Seyed Ghasem Razavipour

摘要

In the quest for high-performance terahertz (THz) quantum cascade lasers (QCLs), this study introduces a generalized wavefunction engineering approach to efficiently control state populations at elevated temperatures. Analyzing known two-well structures and their limitations, a three-well QCL design based on a direct depopulation scheme is proposed. Employing a combination of rate equations-density matrix and NEGF modelings, our design achieves superior performance at 290 K by simultaneously optimizing injection coupling, thermal back-filling, and electron escape rates from upper and lower lasing states to parasitic states.