Abstract

In this Letter, we propose a method to design ultrabroadband near-perfect absorbers, consisting of a periodic dielectric–metal multilayer. In the method, the Bloch theorem and optical topological transition (OTT) of iso-frequency surfaces are employed to manipulate the start and end of the near-perfect spectral absorption band, respectively. Moreover, we design and fabricate an ultrabroadband near-perfect absorber utilizing the proposed method. The average absorption of the designed absorber is 95% in the focused visible and near-infrared range (0.4–2 μm). This omnidirectional and polarization-independent near-perfect absorber is promising for solar energy harvesting, emissivity control, and thermal imaging.

© 2017 Optical Society of America

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