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Design of unidirectional energy flow film based on micro-prism structure

SHIGANG WU1, YANXUE GONG2, ZHILIN XIA3,*

Affiliation

  1. School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandong 255049, PR China
  2. Zibo hitech material co., ltd, Zibo, Shandong 255049, PR China
  3. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, Hubei 430070, PR China

Abstract

Unidirectional transmission optical elements are mainly designed based on metal surface microstructures, photonic crystals, etc. and the unidirectional ratio can reach 100%. These elements are mainly used in optical communications, optical switch and have unidirectional energy flow in a narrow spectral range. However, in the other cases, such as solar cells and radiative cooling, unidirectional transmission is usually required in a wide spectral range. In this paper, a unidirectional transmission film with micro-prism structure is proposed and demonstrated based on geometrical optics. When the refractive index of the used materials is about 2.0 and the bottom angle of the micro-prism is between 58-65 degrees, the unidirectional energy flow difference of the film is about 55%. Although this structure cannot achieve 100% unidirectional energy flow ratio, its working band is very wide..

Keywords

Unidirectional energy flow, Micro-prism structure film, Radiative cooling.

Submitted at: March 26, 2021
Accepted at: Feb. 11, 2022

Citation

SHIGANG WU, YANXUE GONG, ZHILIN XIA, Design of unidirectional energy flow film based on micro-prism structure, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 1-2, pp. 9-14 (2022)