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Title: Anti-frost and energy-saving transparent glass widowsmanipulated through solar-absorbing metamaterial coatings

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Title:
Anti-frost and energy-saving transparent glass widowsmanipulated through solar-absorbing metamaterial coatings
Author Name:
William Tong and Alan Tong
Abstract:
In this paper, possible approacheswill be explored for designing transparent glass windowswith anti-frost/anti-fog and energy-saving capabilities by coating nanostructure metamaterials on the widow’s outside surface. The metal-dielectric-metal nano-scale metamaterial structures with periodic metal-dielectric interfaces, when shined with light, acquire surface plasmons thus trapping light at subwavelength scales. When these metamaterials are coated on the outside of a glass window, they may lead to efficient solar radiation absorption, which can be used for anti-frost/anti-fog and energy-saving windows of transportation vehicles and modern buildings. The total thicknessof the so-calledmetamaterial perfect solar absorberis a few tens of nanometer and its absorption band is broad, tunable and insensitive to the angle of incidence.This paper will present a concept to use the matermaterial coating on the window glass to absorb solar spectrum (λ > 0.7 μm) for anti-frost/anti-fog and energy-saving in the winter, meanwhile almost without lowering the luminous transmittance.In the summer, for a rotatable window, its opposite side with the perfect mirror function can be turn to face the sunlight to reflect the sunlight away. By adjusting bottom coating structure, perfect or non-perfect mirror can be formed for natural solar reflection or transmittance.
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