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Theoretical Calculation of the Optical Properties of Gold Nanoparticles
Gang Yin,Songyou Wang,Liangyao Chen,Ming Xu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I
The properties of metal nanoparticles have received considerable attention due to their wide range of applications extending from surface-sensitive spectroscopic analysis to catalysis and microwave polarizers. Various methods for synthesizing these nanoparticles, both spheres and rods, have been described. In this paper, the simulated optical properties of Au nanoparticles are presented. The extinction e±ciencies are calculated using the discrete dipole approximation (DDA). The in°uence of the nanoparticle size and shape on the plasmon resonance bands is investigated. For spherical particles with R · 10 nm, the intensity of extinction increases with increasing radius, but the position of maximum in the spectrum, which is associated with plasmon resonance, does not change. For particles with 10 < R · 50 nm, the extinction spectrum also increases with increasing radius, and the plasmon resonance shifts to red. For particles with R > 50 nm, the extinction spectrum decreases with increasing radius and becomes irregular. For spheroidal and rod-like nanoparticle, there are two peaks in the extinction spectra corresponding to the transverse and the longitudinal resonances. With increasing aspect ratio, the extinction spectral peak of the transverse mode shifts to shorter wavelength while that of the longitudinal mode shifts to longer wavelength. Our theoretical results explain the experimental data well.淺
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INTERLAYER COUPLING AND MAGNETOOPTICS IN MULTILAYERS
M. Lu,Q. S. Bie,Y. B. Xu,H. R. Zhai,S.M.Zhou,Liangyao Chen,Q.Y.Jin 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Additional magnetooptical Kerr effect (AMOKE) was observed in several multilayer structures. For Fe/Pd and Co/Cu multilayers, AMOKE enhanced the Kerr rotation in short wavelength side. while for Fe/Ag and FeSi/Cu multilayer systems the Kerr rotation enhancement appeared in long wavelength side. A number of ferromagnetic/nonmagnetic/ferromagnetic(FM/NM/FM) sandwiches showed that the AMOKE led to oscillations of Kerr rotation and Kerr ellipticity in Certain wavelength range with changing NM layer thickness similar to the oscillatory interlayer coupling. The oscillation of effective optical constants related to the MOKE oscillation was observed for the first time. The mechanisms of the AMOKE were discussed.
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