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Lanthanum hexaboride nanoparticles, with high emission electrons in cathode materials and peculiar blocking near infrared wavelengths, were applied for many aspects. Based on the quasi-static approximation of Mie theory, the size dependent optical properties of LaB 6 nanoparticles were researched, such as refractive index n (ω), extinction coefficient k (ω), reflectivity R (ω), absorption coefficient α(ω), and electron energy loss L (ω). Due to the localized surface plasmon resonance (LSPR), the extinction coefficient k (ω) and absorption coefficient α(ω) depended on the size, and the LSPR peaks red-shifted with sizes increased, which was different from that of bulk materials. In addition, electron energy-loss spectrum L (ω) showed electrons oscillation reinforced, since electrons absorbed the photon energy and generated resonance. Further, reflectivity R (ω) and refractive index n (ω) indicated that the light in near infrared region could not be propagated on the surface of LaB 6 materials, which exhibited metallic behaviors. So the resonance peak of LaB 6 nanoparticle was located in near-infrared region, making use of this property for solar control glazing and heat-shielding application. |
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