Ultra-broadband reflectionless Brewster absorber protected by reciprocity

Jie Luo; Hongchen Chu; Ruwen Peng; Mu Wang; Jensen Li; Yun Lai

doi:10.1038/s41377-021-00529-2

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Ultra-broadband reflectionless Brewster absorber protected by reciprocity

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- Ultra-broadband reflectionless Brewster absorber protected by reciprocity
- Ultra-broadband reflectionless Brewster absorber protected by reciprocity
- LSA 2021年10卷第5期页码：931-940
- Affiliations：
  
  1.School of Physical Science and Technology, Soochow University, Suzhou, 215006, China
  2.National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
  3.Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
  4.William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- Author bio：
  
  Jie Luo (luojie@suda.edu.cn)
  Jensen Li (jensenli@ust.hk)
  Yun Lai (laiyun@nju.edu.cn)
- Funds：
- DOI：10.1038/s41377-021-00529-2
  中图分类号：
- 纸质出版日期：2021-05-31，
  
  网络出版日期：2021-04-23，
  
  收稿日期：2020-11-26，
  
  修回日期：2021-03-22，
  
  录用日期：2021-04-06
- Accepted：
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Ultra-broadband reflectionless Brewster absorber protected by reciprocity[J]. LSA, 2021,10(5):931-940.

Luo, J. et al. Ultra-broadband reflectionless Brewster absorber protected by reciprocity. Light: Science & Applications, 10, 931-940 (2021).
Ultra-broadband reflectionless Brewster absorber protected by reciprocity[J]. LSA, 2021,10(5):931-940. DOI： 10.1038/s41377-021-00529-2.

Luo, J. et al. Ultra-broadband reflectionless Brewster absorber protected by reciprocity. Light: Science & Applications, 10, 931-940 (2021). DOI： 10.1038/s41377-021-00529-2.

摘要

Abstract

The Brewster's law predicts zero reflection of p-polarization on a dielectric surface at a particular angle. However

when loss is introduced into the permittivity of the dielectric

the Brewster condition breaks down and reflection unavoidably appears. In this work

we found an exception to this long-standing dilemma by creating a class of nonmagnetic anisotropic metamaterials

where anomalous Brewster effects with independently tunable absorption and refraction emerge. This loss-independent Brewster effect is bestowed by the extra degrees of freedoms introduced by anisotropy and strictly protected by the reciprocity principle. The bandwidth can cover an extremely wide spectrum from dc to optical frequencies. Two examples of reflectionless Brewster absorbers with different Brewster angles are both demonstrated to achieve large absorbance in a wide spectrum via microwave experiments. Our work extends the scope of Brewster effect to the horizon of nonmagnetic absorptive materials

which promises an unprecedented wide bandwidth for reflectionless absorption with high efficiency.

关键词

Keywords

references

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