Abstract
Two-dimensional (2D) photonic structures, widely used for generating photonic band gaps (PBG) in a variety of materials, are for the first time integrated with the temperature-dependent phase change of vanadium dioxide (VO2). VO2 possesses thermochromic properties, whose potential remains unrealized due to an undesirable yellow-brown color. Here, a SiO2/VO2 core/shell 2D photonic crystal is demonstrated to exhibit static visible light tunability and dynamic near-infrared (NIR) modulation. Three-dimensional (3D) finite difference time domain (FDTD) simulations predict that the transmittance can be tuned across the visible spectrum, while maintaining good solar regulation efficiency (ΔTsol = 11.0%) and high solar transmittance (Tlum = 49.6%). Experiments show that the color changes of VO2 films are accompanied by NIR modulation. This work presents a novel way to manipulate VO2 photonic structures to modulate light transmission as a function of wavelength at different temperatures.
Original language | English |
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Pages (from-to) | 33112-33120 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 48 |
Early online date | 23 Nov 2016 |
DOIs | |
Publication status | Published - 7 Dec 2016 |
Externally published | Yes |
Keywords
- 2D nanostructure
- color change
- FDTD
- photonic crystal
- thermochromic
- vanadium dioxide