研究目的
To investigate the effects of size, ternary mixed crystal, doping concentration, and temperature on linear and nonlinear intersubband optical absorption coefficients and refractive index changes in GaAs/AlxGa1?xAs multi-quantum wells with a lateral electric field.
研究成果
The research demonstrates that the amplitudes and ranges of intersubband optical absorption coefficients and refractive index changes can be modulated by size, ternary mixed crystal composition, doping concentration, temperature, and lateral electric field. Key findings include red shifts with increased Al composition and doping, blue shifts with increased well and barrier widths, and complex behavior with temperature. The lateral electric field induces blue shifts in absorption peaks. These modulations are useful for optimizing optoelectronic devices based on multi-quantum wells.
研究不足
The model does not account for effects such as phonon relaxation time and excitonic absorption, which may lead to discrepancies with experimental results, as noted in the comparison section. The study is theoretical and lacks experimental validation beyond cited references.
1：Experimental Design and Method Selection:
The study uses theoretical modeling based on the effective mass approximation to self-consistently solve the Schr?dinger and Poisson equations for electron wave functions and energy levels in multi-quantum wells under a lateral electric field. Fermi's golden rule is applied to calculate optical absorption coefficients and refractive index changes.
2：Sample Selection and Data Sources:
The model considers GaAs/AlxGa1?xAs multi-quantum wells with varying parameters such as well width, barrier width, Al composition, doping concentration, and temperature. No experimental samples are used; the work is computational.
3：List of Experimental Equipment and Materials:
No specific equipment or materials are listed as the study is theoretical; parameters like effective mass, band gaps, and permittivity are taken from references.
4：Experimental Procedures and Operational Workflow:
The procedure involves numerical solving of equations to obtain energy levels and wave functions, followed by calculation of optical properties using derived formulas. Parameters are varied to study their effects.
5：Data Analysis Methods:
Data analysis includes plotting absorption coefficients and refractive index changes as functions of wavelength and other parameters, with comparisons to experimental data from references.
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