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Metal film materials have been widely used in optical devices, green energy field, biosensor technologies, and so on. In these applications, the properties of metal surface play the significant role. However, propagation characteristics of light in metal-based materials are still confusing. Wavelength-dependent refraction going from negative to positive at air/metal interface was reported in previous...
Cu2ZnSnSe4 thin-films have been produced by a two-stage (2SSS) growth process, at annealing temperatures of 400°C–500°C, with different compositions of metallic precursors/Se, in order to reduce the major secondary phases ZnSe and CuxSey. Raman scattering is used to determine the phases in the thin-films. Under proper preparation conditions CZTSe modes are found to dominate, while the common secondary...
Cu2ZnSnSe4 has shown promise as a potential follow-on for CIGS because of the replacement of In with earth abundant Zn and Sn. At this early stage of development and because of its complexity little is known about its fundamental properties. The band gap in particular seems to vary even for the same film composition. In this paper we present an optical model that can be used to correlate optical properties...
We have experimentally investigated dual-layer fishnet structures in the terahertz regime. The dispersion behavior of the different modes in this structure is inferred from their response to changes in THz wave incident angle and the thickness of the dielectric layer separating the two metallic films. The theory of magnetic plasmon polariton (MPP) is applied to explain the coupled dispersive modes.
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