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Plasmon coupling is a reaction that occurs when two or more plasmonic particles approach each other to a distance below approximately one diameter's length. Upon the occurrence of plasmon coupling, the resonance of individual particles start to hybridize, and their resonance spectra peak wavelength will redshift. The magnitude of the spectra redshift is dependent on the interparticle gap as well as the agglomeration states. A larger redshift is usually associated with smaller interparticle gap and larger cluster size.
A hemispherical Bi₂Se₃ superstructure photothermal converter and its design method
PendingCN122129796AGuaranteed stabilitypromote absorptionSolar heating energyVacuum evaporation coatingConvertersMicrosphere
A photothermal converter based on a hemispherical Bi₂Se₃ superstructure belongs to the field of solar energy technology and applications. The stacked structure from bottom to top consists of: a metal substrate, a silica microsphere mask layer, and a Bi₂Se₃ thin film layer. The metal substrate is made of materials such as titanium and has a thickness greater than the skin depth (≥100 nm). The silica microsphere mask layer forms a close-packed array through self-assembly, with microspheres having a diameter of 200 nm. The Bi₂Se₃ thin film is prepared through conformal deposition, with a thickness ranging from several nanometers to hundreds of nanometers. This device utilizes the bulk-surface state synergistic effect of the topological insulator Bi₂Se₃, combined with Mie resonance excited by a hemispherical superstructure and plasmon coupling, to achieve an average high absorption rate of 97% in the 0.3–2.5 μm band and an emissivity as low as 0.07 in the 2.5–25 μm band. It exhibits stable absorption characteristics over a wide incident angle (0°–60°) and can be prepared in a low-cost and controllable manner through self-assembled microsphere masks and magnetron sputtering technology, providing a feasible solution for high-performance solar thermal conversion systems.
Owner:BEIJING UNIV OF TECH