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Simulating far infrared spectra of ZnMnSe/GaAs epifilms, MnSe/ZnSe superlattices and predicting impurity modes of N, P defects in ZnMnSe.
Sci Technol Adv Mater
December 2016
Department of Electrophysics, National Chio Tung University, Hsinchu , Taiwan , ROC.
A comprehensive lattice dynamical study is reported to emphasize the vibrational behavior of perfect/imperfect zinc-blende (zb) ZnSe, MnSe and ZnMnSe alloys. Low temperature far-infrared (FIR) reflectivity measurements performed on a series of molecular beam epitaxy grown ZnMnSe/GaAs (001) epilayers have a typical 'intermediate-phonon-mode' behavior. Besides perceiving ZnSe- and MnSe-like TO-phonon resonances, the study also revealed a weak Mn alloy-disorder mode below MnSe band.
View Article and Find Full Text PDFFor a high T(c) superconductor, a theory is derived that superreflectance (R = 100%) is due to EM field exclusion but is restricted by the energy gap to the far infrared and longer wavelengths. Presence of ohmic dissipation modifies but does not dramatically change the nature of the results. At oblique incidence, EM exclusion leads to surface waves.
View Article and Find Full Text PDFPerforated metal plates (grids) of various kinds are used for the construction of transmission filters for the far ir. Examples are given of filters with low pass, high pass, bandpass, and bandstop characteristics with steep slopes. These filters are the optical equivalents of microwave waveguide filters.
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