Infrared-blocking plasmonic meta-glass for energy-saving passive windows

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Passive windows are crucial for reducing energy consumption in buildings and vehicles.
• Blocking infrared radiation while transmitting visible light is key to efficient thermal management and illumination.

Purpose of the Study:

• To design and demonstrate a plasmonic meta-glass for selective infrared radiation blocking and visible light transmission.
• To achieve high infrared rejection and significant visible light transmission for energy-saving applications.

Main Methods:

• Fabrication of a two-dimensional hexagonal array of tungsten nanorings on a silica glass substrate.
• Utilizing surface plasmon excitation in the infrared spectrum for selective transmission suppression.
• Tailoring the nanoring dimensions to control the spectral performance.

Main Results:

• The meta-glass blocks up to 87% of infrared radiation (750-1800 nm), a primary source of indoor radiative heating.
• An average visible light transmission of 60% is maintained for indoor illumination.
• The polarization-independent design shows superior performance compared to existing window glass technologies.

Conclusions:

• The developed plasmonic meta-glass offers a promising solution for energy-efficient windows.
• Tunable optical properties through nanostructure design enable customized performance for various applications.
• This technology has the potential to significantly reduce global energy usage for cooling and lighting.