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Energy Transport for Nanostructured Materials

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Front. Energy Res. | doi: 10.3389/fenrg.2018.00020

Atmosphertic-window-matching hierarchical broadband infrared absorber realized by lithography-free fabrication

  • 1Hong Kong University of Science and Technology, Hong Kong
  • 2Shenzhen Research Institute, Peking University, China

An ultra-broadband selective absorber has been realized with a hierarchical structure through integrating vacuum impedance matched structure, quarter wavelength structure and gradient refractive index structure. Through optimizing the design parameters of the proposed hierarchical structure, an ultra-broadband infrared absorber covering three major atmospheric windows (0.7~2.5 μm, 3~5 μm and 8~14 μm) has been numerically and experimentally demonstrated. An overall absorption up to 80% covering all the three major atmospheric infrared windows and a ratio of the total absorptions within and beyond the windows as high as 5.88, has been achieved with the developed absorber. The high absorption and spectral selectivity of the absorber make it promising for sensitive broadband infrared spectroscopy detection. The proposed hierarchical structure also provides great design freedom with many tunable factors, making it convenient to extend the design for other applications. In addition, we developed a cost-effective lithography-free method for the fabrication of this structure. The design flexibility and fabrication convenience of this hierarchical structure render it suitable for the development of tailored selective broadband absorbers for targeted applications.

Keywords: Antireflection, hierarchical structure, Lithography-free fabrication, broadband infrared absorption, atmospheric transmission

Received: 17 Dec 2017; Accepted: 09 Mar 2018.

Edited by:

Qing Hao, University of Arizona, United States

Reviewed by:

Tandeep S. Chadha, Applied Particle Technology, LLC, United States
Shuang Tang, SUNY Polytechnic Institute, United States  

Copyright: © 2018 Li, Li, Su, Chi and Huang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Baoling Huang, Hong Kong University of Science and Technology, Kowloon, Hong Kong,