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首页> 外文会议>Optical Systems Design 2015: Advances in optical thin films V >Some aspects of absorption and gain
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Some aspects of absorption and gain

机译：吸收和增益的某些方面

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Absorption and gain are difficult to define precisely but in the sense we shall use the terms, they represent a failure of the sum of specularly reflected and transmitted light to equal that incident. A greater sum represents gain and a lesser, absorption. Although there is a variety of physical processes that can contribute to these phenomena, their quantitative expression can be achieved through a nonzero extinction coefficient k. In the normal way we encourage gain and discourage absorption, but, recently, an increasing interest in enhancing absorption has emerged. Calculations involving nonzero k are straightforward but understanding the consequences can be a little more difficult. The admittance diagram can help in this and especially in respect of lasers, amplifiers and perfect and coherent perfect absorbers. Normal thin-film calculations start from the light that enters the emergent medium through the rear surface and works backwards to find the conditions at the surface of incidence, but the normal model is capable of much more. It can readily handle a much wider range of conditions. In terms of the admittance diagram, it is simply necessary to open up the second and third quadrants of the complex plane. In those quadrants the net flow of energy is in the opposite direction and the rules for the loci are a little different from those in the more usual first and fourth quadrants.
机译：吸收和增益很难精确定义，但从某种意义上讲，我们将使用这些术语，它们表示镜面反射和透射光之和等于入射的失败。总和越大表示增益，而吸收越小。尽管有多种物理过程可导致这些现象，但它们的定量表达可通过非零消光系数k来实现。通常，我们鼓励获取和阻止吸收，但是最近，人们对增强吸收产生了越来越大的兴趣。涉及非零k的计算很简单，但要了解结果可能会有些困难。导纳图可以帮助实现这一点，尤其是在激光器，放大器以及完美且相干的完美吸收体方面。正常的薄膜计算从从后表面进入出射介质的光开始，然后向后工作以找到入射表面的条件，但是正常模型的功能更多。它可以轻松应对更广泛的条件。就导纳图而言，仅需打开复平面的第二和第三象限。在这些象限中，能量的净流向相反，并且位点的规则与更常见的第一和第四象限中的规则略有不同。

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