Longwave-transparent low-emissivity material.

Area of Science:

• Photonics and Materials Science
• Energy Conservation Technologies
• Smart City Infrastructure

Background:

• Low-emissivity (low-e) materials are vital for thermal energy management but often suffer from metallic properties causing longwave attenuation.
• Existing low-e materials have limitations hindering their widespread application in diverse fields like buildings and logistics.

Purpose of the Study:

• To introduce an all-dielectric longwave-transparent low-e material (LLM) with ultra-broadband transmittance.
• To demonstrate the energy-saving potential and novel capabilities of the developed LLM.

Main Methods:

• Development of a meter-scale, all-dielectric material exhibiting high transmittance across terahertz to kilohertz frequencies.
• Evaluation of energy savings compared to commercial white paint and traditional low-e materials.
• Assessment of new applications enabled by the material's unique optical properties.

Main Results:

• The LLM achieves ultra-broadband, high transmittance over nine orders of magnitude.
• Demonstrated energy savings of up to 41.1% over white paint and 10.2% over traditional low-e materials.
• Enabled capabilities include high-speed wireless communication, radiative thermal insulation for wireless energy transfer, and noninvasive terahertz screening.

Conclusions:

• The developed LLM offers a significant advancement in low-e material technology, overcoming limitations of metallic counterparts.
• This photonic solution contributes to carbon neutrality and smart city development by enhancing energy efficiency and enabling new technological applications.
• The material paves the way for a more sustainable and interconnected future in various sectors.