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Journal Article

Casting dissipative compact states in coherent perfect absorbers


Danieli,  Carlo
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Danieli, C., & Mithun, T. (2020). Casting dissipative compact states in coherent perfect absorbers. Physical Review Research, 2(1): 013054. doi:10.1103/PhysRevResearch.2.013054.

Cite as: https://hdl.handle.net/21.11116/0000-0008-2A6A-3
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 quasione-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.