Surface electromagnetic modes of SiC and non-linear optimization
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摘要: 基于特殊的SiC周期性结构，理论分析了SiC表面特殊电磁模态的激发特性，并利用数值模拟的方法研究了该周期性结构的红外辐射/吸收特性。模拟结果表明该周期性结构在电磁波照射下可以支持多种电磁模态的激发，并且多种电磁模态之间存在相互耦合现象，证实了理论分析的结果。基于非线性优化算法，分别对结构在单个频率整个角度范围内的红外辐射/吸收特性，以及整个研究频段内的垂直方向红外辐射/吸收特性进行了优化。优化的结果显示，相比于原来的结构，优化后结构的等效发射率/吸收率有较显著地提升。Abstract: Spectral and directional control of infrared radiation based on excitation of confined electromagnetic resonant modes opens up a viable way for design and study of new semiconductor materials, electromagnetic and thermal analysis of micro/nano scale electronics. In this paper, we present numerical simulation results of the thermal radiative properties of a silicon carbide (SiC) thermal emitter/absorber. We illustrate different electromagnetic resonant modes which can be excited with the structure and the process of radiation spectrum optimization based on a non-linear optimization algorithm. The results show that the spectral and directional control of thermal emission/absorption can be efficiently achieved by adjusting the geometrical parameters of the structure.
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Key words:
- surface electromagnetic modes /
- silicon carbide /
- non-linear method
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