在相干理想吸收体中铸造耗散紧致态
Casting dissipative compact states in coherent perfect absorbers
摘要：
相干完全吸收（CPA）又称时间反转激光，是由透射波和反射波的相消干涉相互作用而产生的一种波动现象。在这项工作中，我们考虑准一维晶格网络，其中至少有一个平带，并表明CPA和激光可以诱导在线性和非线性制度的晶格微调非厄米缺陷（耗散项本地化在一个单元格）。我们表明，当地的耗散，产生CPA同时产生新的耗散紧凑的解决方案的晶格，其增长或衰减的时间可以微调通过耗散参数。该方案用于数值可视化的理论研究结果提供了一个新的平台，这些现象的实验实施在光学器件。
英文摘要：
Coherent perfect absorption (CPA), also known as time-reversed laser, is a wave phenomenon resulting from the reciprocity of destructive interference of transmitted and reflected waves. In this work we consider quasi one-dimensional lattice networks which posses at least one flat band, and show that CPA and lasing can be induced in both linear and nonlinear regimes of this lattice by fine-tuning non-Hermitian defects (dissipative terms localized within one unit-cell). We show that local dissipations that yield CPA simultaneously yield novel dissipative compact solutions of the lattice, whose growth or decay in time can be fine-tuned via the dissipation parameter. The scheme used to numerically visualize the theoretical findings offers a novel platform for the experimental implementation of these phenomena in optical devices.
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