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271.
Study on guided-mode resonance characteristic of multilayer dielectric grating with broadband and wide using-angle 下载免费PDF全文
Guided-mode resonance in a diffraction band of multilayer
dielectric gratings may lead to a catastrophic result in laser
system, especially in the ultrashort pulse laser system, so the
inhibition of guided-mode resonance is very important. In this paper
the characteristics of guided-mode resonance in multilayer
dielectric grating are studied with the aim of better understanding
the physical process of guided-mode resonance and designing a
broadband multilayer dielectric grating with no guided-mode
resonance. By employing waveguide theory, all guided-wave modes
appearing in multilayer dielectric grating are found, and the
incident conditions, separately, corresponding to each guided-wave
mode are also obtained. The electric field enhancement in multilayer
dielectric grating is shown obviously. Furthermore, from the
detailed analyses on the guided-mode resonance conditions, it is
found that the reduction of grating period would effectively avoid
the appearing of guided-mode resonance. And the expressions for
calculating maximum periods, which ensure that no guided-mode
resonance occurs in the requiring broad angle or wavelength range,
are first reported. The above results calculated by waveguide theory
and Fourier mode method are compared wit each other, and they are
coincident completely. Moreover, the method that relies on waveguide
theory is more helpful for understanding the guided-mode resonance
excited process and analyzing how each parameter affects the
characteristic of guided-mode resonance. Therefore, the effects of
multilayer dielectric grating parameters, such as period, fill
factor, thickness of grating layer, {\it et al.}, on the guided-mode
resonance characteristic are discussed in detail based on waveguide
theory, and some meaningful results are obtained. 相似文献
272.
273.
建立了平面行星夹具薄膜淀积无量纲模型,通过对蒸发源位置L/H、行星主轴与副轴距离P/H、夹角倾角A以及蒸发源蒸汽发射特性N等因素的分析,得到了典型径向理论均匀的优化几何配置.并从优化几何配置的膜料效率、角向均匀性和膜厚分布对蒸发源蒸汽发射特性变化的敏感性方面评价优化结果,得到了最优化设计区域.结果表明,优化配置的L/H+P/H小,则角分布差异小;L/H+P/H和A小,则膜料效率高L<P,A=-15°时,优化配置对N变化最不敏感L>P时,由N变化引起的典型径向分布变化小于0.5%. 相似文献