论文标题
具有光谱奇点的阵列的通用形式
A universal form of arrays with spectral singularities
论文作者
论文摘要
一系列非热波导可以用作激光或连贯的完美吸收器，对应于基本离散复合电位的光谱奇异性。我们表明，所有具有光谱奇点的晶格电位的特征是增益和损害分布的通用形式。使用此结果，我们系统地构建了以任意波长处的光谱奇异性以及光谱中具有二阶光谱奇异性的电势为特征的。高阶光谱奇异性表现出对入射梁的反应大大增强，从而激发了高强度激发模式。
An array of non-Hermitian optical waveguides can operate as a laser or as a coherent perfect absorber, which corresponds to a spectral singularity of the underlying discrete complex potential. We show that all lattice potentials with spectral singularities are characterized by the universal form of the gain-and-loss distribution. Using this result we systematically construct potentials characterized by several spectral singularities at arbitrary wavelengths, as well as potentials with second-order spectral singularities in their spectra. Higher-order spectral singularities demonstrate a greatly enhanced response to incident beams resulting in the excitation of high-intensity lasing modes.
