Theoretical Study on the Dual-wavelength Second Harmonic Generation with Transverse Gradient Nested Optical Superlattice
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Dual-wavelength second harmonic generation with transverse gradient nested optical superlattice is investigated. The ratio of SHG of two fundamental wavelengths can be controlled by adjusting the position of incident light. This study shows that the efficiency of SHG is related to the temperature and coherent length of the nested structure.Keywords:
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Harmonic
We show that it is possible to control the gap between the minibands of a superlattice by introducing positive barriers in the wells of the superlattice. An appropriate choice of the position, the width, and the height of these barriers achieved by standard methods can reduce or even close the minigaps of the superlattice.
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In recent literatures, it has been presumed from the electric-resistance measurement, the magnetic analysis and the hardness measurement that in the alloy of the composition of atomic ratio 1:1 in Fe-Cr system, a superlattice would be formed, if the alloy is quenched from 1000° and annealed at 500° for a week followed by furnace-cooling.To ascertain this presumption an X-ray examination was performed. The specimen, which was heat-treated as described above, was X-rayed, Mn-K radiation being used to make the superlattice lines distinct.The diffraction pattern obtained shows no superlattice lines but only fundamental, where as it is predicted that the superlattice lines would be sufficiently strong to be detectable on the assumption of the superlattice of CsCl type. Therefore, it is concluded that the superlattice of a long range order is not present.
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The superlattice unit-cell structure factors are calculated for the trapeziform model, which may be used for the epitaxically prepared one-dimensional superlattice crystals if the interdiffusion is taken into account. The particular cases of this model are: (1) the rectangular model, which describes the superlattice if the interdiffusion is negligible; (2) the triangular model, which describes the superlattice if the interdiffusion takes place all over the layer thickness. The change of satellite intensities during the interdiffusion is discussed. The results obtained may be used to interpret the X-ray diffraction patterns produced by superlattices.
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Extremely high frequency
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On the basis of the film structure of a Pt/AlN multilayer film which exhibits a superlattice peak after annealing, a disc-shaped nanocrystal model is proposed for simulating the diffraction line profile from a one-dimensional superlattice. The proposed model demonstrates that a superlattice peak can arise even from just two disc-shaped nanocrystals and even with a large misorientation (a few degrees), provided both the thickness and the in-plane crystal size of the nanocrystals are of the order of nanometres. Using the model, the superlattice peaks from Pt/AlN superlattices are analysed quantitatively and the effect of annealing on the film is discussed.
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The sample preparation of superlattice films for a phase change memory (PCM) and the electrical characteristics of superlattice PCM are reported. Superlattice films with no inclusion of alloy were obtained. The strong RESET pulse width dependence is discussed.
Phase-change memory
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