Designing ultrabroadband absorbers based on Bloch theorem and optical topological transition

作者：Kan, Y. H.; Zhao, C. Y.^*; Fang, X.; Wang, B. X.

来源：Optics Letters, 2017, 42(10): 1879-1882.

DOI：10.1364/OL.42.001879

• BROAD-BAND
• LIGHT-ABSORPTION
• WIDE-ANGLE

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 similar to 95% in the focused visible and near-infrared range (0.4-2 mu m). This omnidirectional and polarization-independent near-perfect absorber is promising for solar energy harvesting, emissivity control, and thermal imaging.

• 出版日期2017-5-15
• 单位上海交通大学