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Robust incoherent perfect absorption
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DOI：10.1103/PhysRevResearch.6.L022006.png)
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Abstract
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A coherent perfect absorber is capable of completely absorbing input waves. However, the coherent perfect absorption severely depends on the superposition of the input waves, and the perfect absorption is sensitive to the disorder of the absorber. Thus, a robust incoherent perfect absorption, being insensitive to the superposition of input waves and the system disorder, is desirable for practical applications. Here, we demonstrate that the linearly independent destructive interference at the port connections removes the constraint on the coherent input. We propose an approach using the interplay between the loss and localization to form the incoherent perfect absorption. The resonant incidence from either port is completely absorbed. Furthermore, we utilize the lattice configuration supporting the flat band to demonstrate the disorder-immune incoherent perfect absorption. Our findings provide insight into the fundamentals and applications for the perfect absorption of light, microwaves, sound, mechanical waves, and beyond.
Keywords:
FLAT-BAND
COHERENT
TRANSMISSION
LATTICES
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