研究目的
Investigating the amplification and generation of optical TE waves in a semiconductor waveguide based on n-GaAs due to a space charge wave (SCW).
研究成果
The conditions for amplification and generation of difference synchronized optical radiation in a semiconductor waveguide based on n-GaAs were found. The reflectance and transmittance for pairs of counterpropagating TE modes with the same indices are studied. The results can be used to create tunable semiconductor laser emitters based on SCW-optical interaction.
研究不足
The study requires a sufficiently high level of optical pumping due to the small depth of permittivity modulation and noticeable mismatch of the propagation constants. The advantage of the considered waveguide structure is the ability to control the parameters of the SCW-grating.
1：Experimental Design and Method Selection:
The study considers the regimes of amplification and generation of optical TE waves in a perturbed n-GaAs waveguide. The reflectance and transmittance of TE modes are calculated based on the pump level and interaction length between optical and SCWs.
2：Sample Selection and Data Sources:
The structure is formed by an optical waveguide consisting of a substrate, a semiconductor film (n-GaAs), and a cover medium. The parameters for numerical analysis are selected at room temperature T = 300 K.
3：List of Experimental Equipment and Materials:
An n-GaAs film is used as the guiding layer with specific refractive index dispersion. The AlxGa1?xAs semiconductor substrate and covering layer have a refractive index of n1 ≈
4：Experimental Procedures and Operational Workflow:
The propagation of SCWs in the quasistatic approximation is described by a dispersion equation. The coupling coefficient for waveguide TE modes is calculated, and the system of coupling equations for guided counterpropagating modes is analyzed.
5：Data Analysis Methods:
The energy coefficients of reflection and transmission of modes in the waveguide are calculated to study the conditions for the generation of corresponding waves.
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