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Two-Dimensional SiO2/VO2 Photonic Crystals with Statically Visible and Dynamically Infrared Modulated for Smart
Yujie Ke1, Igal Balin2, Ning Wang1
1School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore.
ACS Applied Materials & Interfaces
|December 10, 2016
Summary
This study integrates 2D photonic crystals with vanadium dioxide (VO2) phase transitions for tunable light modulation. The novel SiO2/VO2 core/shell structure achieves dynamic visible and near-infrared light control.
Area of Science:
- Materials Science
- Optics and Photonics
- Nanotechnology
Background:
- Two-dimensional (2D) photonic structures are key for photonic band gaps (PBG).
- Vanadium dioxide (VO2) exhibits thermochromic properties but has an undesirable color.
- Integrating VO2 with photonic structures offers potential for advanced optical devices.
Purpose of the Study:
- To integrate 2D photonic crystals with the temperature-dependent phase change of VO2.
- To overcome the color limitations of VO2 by creating a tunable photonic structure.
- To demonstrate dynamic modulation of light transmission across visible and near-infrared spectra.
Main Methods:
- Fabrication of a SiO2/VO2 core/shell 2D photonic crystal.
- Utilized three-dimensional (3D) finite difference time domain (FDTD) simulations.
- Experimental characterization of transmittance and color change with temperature.
Main Results:
- The SiO2/VO2 photonic crystal demonstrated static visible light tunability.
- Dynamic near-infrared (NIR) modulation was achieved.
- Simulations predicted tunable transmittance across the visible spectrum with high solar regulation efficiency (ΔTsol = 11.0%) and luminous transmittance (Tlum = 49.6%).
- Experimental results confirmed NIR modulation accompanying VO2 color changes.
Conclusions:
- This work presents a novel method for manipulating VO2 photonic structures.
- The developed structure enables light transmission modulation as a function of wavelength at different temperatures.
- The findings pave the way for advanced smart window and optical filtering applications.
