作为阈值共振的光谱奇异性
Optical Spectral Singularities as Threshold Resonances
摘要：
光谱奇异性是复杂散射势的一般数学特征之一。物理上，它们对应于表现为零宽度共振的散射态。对于一个简单的光学系统，只要增益系数与其阈值相一致，并且系统的其它参数选择适当，就会出现光谱奇异性。我们探讨了一个典型的半导体增益介质的光谱奇异性的具体实现，并提出了一种方法，构建一个可调谐激光器，工作在阈值增益。
英文摘要：
Spectral singularities are among generic mathematical features of complex scattering potentials. Physically they correspond to scattering states that behave like zero-width resonances. For a simple optical system, we show that a spectral singularity appears whenever the gain coefficient coincides with its threshold value and other parameters of the system are selected properly. We explore a concrete realization of spectral singularities for a typical semiconductor gain medium and propose a method of constructing a tunable laser that operates at threshold gain.
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