中国物理B ›› 2021, Vol. 30 ›› Issue (6): 64214-064214.doi: 10.1088/1674-1056/abd697

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Efficient realization of daytime radiative cooling with hollow zigzag SiO2 metamaterials

Huawei Yao(姚华伟)1, Xiaoxia Wang(王晓霞)1, Huaiyuan Yin(殷怀远)1, Yuanlin Jia(贾渊琳)1, Yong Gao(高勇)2, Junqiao Wang(王俊俏)1, and Chunzhen Fan(范春珍)1,†   

  1. 1 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China;
    2 Department of Physics, Shanghai Polytechnic University, Shanghai 201209, China
  • 收稿日期:2020-11-20 修回日期:2020-12-11 接受日期:2020-12-24 出版日期:2021-05-18 发布日期:2021-06-05
  • 通讯作者: Chunzhen Fan E-mail:chunzhen@zzu.edu.cn
  • 基金资助:
    Project supported by the Natural Science Foundation of Henan Educational Committee (Grant No. 21A140026).

Efficient realization of daytime radiative cooling with hollow zigzag SiO2 metamaterials

Huawei Yao(姚华伟)1, Xiaoxia Wang(王晓霞)1, Huaiyuan Yin(殷怀远)1, Yuanlin Jia(贾渊琳)1, Yong Gao(高勇)2, Junqiao Wang(王俊俏)1, and Chunzhen Fan(范春珍)1,†   

  1. 1 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China;
    2 Department of Physics, Shanghai Polytechnic University, Shanghai 201209, China
  • Received:2020-11-20 Revised:2020-12-11 Accepted:2020-12-24 Online:2021-05-18 Published:2021-06-05
  • Contact: Chunzhen Fan E-mail:chunzhen@zzu.edu.cn
  • Supported by:
    Project supported by the Natural Science Foundation of Henan Educational Committee (Grant No. 21A140026).

摘要: A tunable selective emitter with hollow zigzag SiO2 metamaterials, which are deposited on Si3N4 and Ag film, is proposed and numerically investigated for achieving excellent radiative cooling effects. The average emissivity reaches a high value of 98.7% in the atmospheric window and possesses a high reflectivity of 92.0% in the solar spectrum. To reveal the enhanced absorptivity, the confined electric field distribution is investigated, and it can be well explained by moth eye effects. Moreover, tunable emissivity can also be initiated with different incident angles and it stays above 83% when the incident angle is less than 80°, embodying the excellent cooling performance in the atmospheric transparency window. Its net cooling power achieves 100.6 W·m-2, with a temperature drop of 13°, and the cooling behavior can persist in the presence of non-radiative heat exchange conditions. Therefore, high and tunable selective emitters based on our designed structure could provide a new route to realizing high-performance radiative cooling. This work is also of great significance for saving energy and environmental protection.

关键词: daytime radiative cooling, hollow zigzag metamaterials, net cooling power, emissivity

Abstract: A tunable selective emitter with hollow zigzag SiO2 metamaterials, which are deposited on Si3N4 and Ag film, is proposed and numerically investigated for achieving excellent radiative cooling effects. The average emissivity reaches a high value of 98.7% in the atmospheric window and possesses a high reflectivity of 92.0% in the solar spectrum. To reveal the enhanced absorptivity, the confined electric field distribution is investigated, and it can be well explained by moth eye effects. Moreover, tunable emissivity can also be initiated with different incident angles and it stays above 83% when the incident angle is less than 80°, embodying the excellent cooling performance in the atmospheric transparency window. Its net cooling power achieves 100.6 W·m-2, with a temperature drop of 13°, and the cooling behavior can persist in the presence of non-radiative heat exchange conditions. Therefore, high and tunable selective emitters based on our designed structure could provide a new route to realizing high-performance radiative cooling. This work is also of great significance for saving energy and environmental protection.

Key words: daytime radiative cooling, hollow zigzag metamaterials, net cooling power, emissivity

中图分类号:  (Optical processors, correlators, and modulators)

  • 42.79.Hp
78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 44.40.+a (Thermal radiation)