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Effects of interplay between metal subwavelength slits on extraordinary optical transmission 下载免费PDF全文
In this paper we study the extraordinary optical transmission of one-dimensional multi-slits in an ideal metal film.The transmissivity is calculated as a function of various structural parameters.The transmissivity oscillates,with the period being just the light wavelength,as a function of the spacing between slits.As the number of slits increases,the transmissivity varies in one of three ways.It can increase,attenuate,or remain basically unchanged,depending on the spacing between slits.Each way is in an oscillatory manner.The slit interaction responsible for the oscillating transmission strength that depends on slit spacing is the subject of more detailed investigation.The interaction most intuitively manifests as a current distribution in the metal surface between slits.We find that this current is attenuated in an oscillating fashion from the slit corners to the center of the region between two adjacent slits,and we present a mathematical expression for its waveform. 相似文献
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Investigation of ultra—thin ferromagnetic films with a simple cubic lattice 总被引:1,自引:0,他引:1 下载免费PDF全文
Using Green‘s function method,we investigate ferromagnetic films with a simple cubic lattice containing up to ten monolayers.The Hamiltonian includes the Heisenberg exchange term,surface anisotropy (SA) and dipole interaction (DI).We calculate the magnetization as a function of temperature and film thickness,and we analyse the behaviour of spin canting.The result is in agreement with experiments.We calculate phase diagrams of SA versus DI to show the conditions under which spontaneous magnetization can occur.As a special case,we discuss the Heisenberg model without SA and DI. 相似文献
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指导学生编制用于课堂教学的气体动理论计算机演示课件,加强了教学的形象性、过程性和动态性,起到了一定的模拟演示实验的作用. 相似文献
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EFFECT OF THE SUBSTITUTION OF Ga AND Sn FOR Cu ON THE ELECTRONIC STRUCTURE AND SUPERCONDUCTIVITY OF La1.85Sr0.15CuO4 下载免费PDF全文
The electronic structure of La1.85Sr0.15CuO4, as well as the two cases of substitution of Ga and Sn for Cu, has been studied by the recursion method. The change of hole concentration and the effective local magnetic moment have also been calculated. Our calculations show that Ga and Sn destroy the two-dimensional character of the CuO2 plane and lead to the disorder of the electronic structure, accompanied by the migration of electrons which canines the decrease of the hole concentration in the CuO2 planes. From our point of view, these changes may be responsible for the destruction of superconductivity of the Ga and Sn-doped systems. 相似文献
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The effect of transverse correlation between spins on the thermodynamic properties of ferromagnetic systems is investigated in details. Qualitatively, at finite temperature the transverse correlation reflects the short-range interaction between spins, so that lowers the internal energy and consequently raises the free energy. It also means the introduction of some ordering, and hence lowers the entropy. It is depressed by the field which forces the spins to turn to the field direction, so that it decreases with the field when temperature is fixed. The low-temperature expansion of the energy shows that the inclusion of the transverse correlation at least partly considers the interaction between spin waves. 相似文献
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The exchange bias of bilayer magnetic films consisting of
ferromagnetic (FM) and antiferromagnetic (AFM) layers in an
uncompensated case is studied by use of the many-body Green's
function method of quantum statistical theory. The effects of
the layer thickness and temperature and the interfacial coupling
strength on the exchange bias HE are investigated. The
dependence of the exchange bias HE on the FM layer
thickness and temperature is qualitatively in agreement with
experimental results. When temperature varies, both the
coercivity HC and HE decrease with the
temperature increasing. For each FM thickness, there exists a
least AFM thickness in which the exchange bias occurs, which is
called pinning thickness. 相似文献
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