Open AccessHighly transparent all-dielectric metasurface to block the near-infrared region of the solar spectrum
Author(s) -
Eunjong Kim,
Sangwon Baek,
Jae Yong Park,
Kwang Ho Kim,
JongLam Lee
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.403559
Subject(s) - visible spectrum , materials science , transmittance , optics , indium tin oxide , optoelectronics , dielectric , polarization (electrochemistry) , infrared , blocking (statistics) , ray , wavelength , layer (electronics) , nanotechnology , physics , chemistry , statistics , mathematics
Blocking the near-infrared region (NIR) is indispensable for saving energy consumed to maintain the interior temperature in buildings. However, simultaneously enhancing transmission in visible light and blocking in the NIR remains challenging. Here, we theoretically demonstrate a transparent all-dielectric metasurface selectively blocking the NIR by using TiO 2 nanocylinders and an indium tin oxide (ITO) layer. The ITO layer is implemented as a back reflector because ITO is transparent in visible light, whereas the ITO becomes a reflective material in the long-wavelength region (λ > 1500 nm). The designed metasurface exhibits high average transmittance of 70% in visible light and high solar energy rejection (SER) of 90% in the NIR. Furthermore, the blocking capability in the NIR of the designed metasurface is maintained over a wide range of an incident angle and polarization angle of light. Therefore, the metasurface gives a guideline for designing energy-saving applications.