| Autor: |
Sirenko, Yu., Shestopalov, V., Yatsik, V. |
| Zdroj: |
Radiophysics & Quantum Electronics; 1988, Vol. 31 Issue 3, p229-236, 8p |
| Abstrakt: |
We have analyzed the relationship between anomalous wave-scattering conditions in a grating of simple model geometry and the excitation of almost-free field oscillations in the structure. The conclusions can be generalized to other gratings whose geometry is such as to permit the identification of coupling channels between the transmission and reflection zones, in which the conditions for the onset of propagating waves are known (this applies to the majority of gratings used in practice). There can be several channels (in one period) or, when they operate asynchronously (i.e., are not exactly identical), the first and second spectral families of free field oscillations can be formed by virtue of the interference summation of waves of the same mode propagating in different channels. The principal family in this case is the one whose spectral lines converge in the limit δ→∞ to a cutoff point κ that is large in absolute value, but is still responsible for the occurrence of total wave reflection by semitransparent structures [5]. The correspondence established between the spectral and anomalous diffraction characteristics demonstrates the resonant nature of the total-transmission and total-reflection conditions; it also make it possible to explain the distinctive features of their onset and to predict with sufficient reliability the likelihood of their occurrence with predetermined parameters. All the corresponding data can be obtained by analysis of the spectral lines describing the dynamics of the variation of the complex eigenfrequencies of the grating. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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