Photonic crystals are periodic dielectric structures that are designed to establish the energy band structure for photons, allowing or prohibiting the propagation of electromagnetic waves in specific frequency ranges, making them excellent for light-harvesting applications.
Photonic crystals are appealing optical materials that can be used to regulate and manipulate light flow. In the form of thin-film optics, one-dimensional photonic crystals are already widely used, with applications ranging from low and high reflection coatings on lenses and mirrors to colour changing paints and inks.
The naturally occurring gemstone opal is a prominent example of a photonic crystal. Its opalescence is primarily a photonic crystal phenomena caused by light diffraction on the crystal’s lattice planes.
The Global Selective Photonic Crystal Emitter market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
Near-Perfect Selective Photonic Crystal Emitter with Nanoscale Layers for Daytime Radiative Cooling. Radiative cooling has recently received a lot of interest as a passive approach to transfer heat into outer space without using any extra energy.
However, the metal reflector of typical cooling radiators fails to perform in the ultraviolet due to the metal’s massive absorption in such a waveband; in the meantime, selective thermal emission inside the atmospheric window still has a lot of space for improvement.
A dual-band selective emitter with multi-nanolayers that not only compensates for the lack of metal reflectors by utilising the band gap of photonic crystals, but also permits a broadband emissivity peak in the atmospheric window due to appropriate material selection.
At specific wavelength ranges, both a near-perfect solar reflection and a very high thermal emission are accomplished by engineering the forbidden band and thermal emission of photonic crystals simultaneously. This proposes an alternative choice for radiative coolers, as well as a reasonable nanoscale design method for similar photothermal devices.
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