Both transmission and reflection of a short light pulse are considered for a double prism system in the geometry of in-gap refraction with an account of material dispersion. Within a frame of linear optics and Snell refraction law, we revealed the effect of a ‘negative dispersion’ regime close to the total internal reflection. A narrow area of parameters (wave number and angle of incidence) in the close vicinity of the total internal reflection is found to possess specific properties for the refracted field. A resonance excitation of leaky waveguide modes enables to extract the refracted field from the gap efficiently and inspect various transmission regimes. Analytical consideration and simulations demonstrate an appearance of advanced pulse in the transmitted and reflected waveforms, with the temporal shape depending on a number of modes enclosed in a spectral width of an incident pulse as well as the existence of elongated precursor within a gap.

中文翻译：

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双棱镜布局中的光脉冲传播接近全内反射的角度

对于双棱镜系统，考虑到材料色散，在间隙内折射的几何形状中考虑了短光脉冲的透射和反射。在线性光学和斯涅尔折射定律的框架内，我们揭示了“负色散”状态接近全内反射的影响。发现在全内反射附近很窄的参数区域（波数和入射角）对折射场具有特定的属性。泄漏波导模式的共振激发能够有效地从间隙中提取折射场并检查各种传输方式。分析性考虑和仿真表明，在透射和反射波形中出现了高级脉冲，