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Rigorous analysis of extremely asymmetrical scattering of electromagnetic waves in slanted periodic gratings
Nieminen, T. A. and Gramotnev, D. K. (2001-01-01) Rigorous analysis of extremely asymmetrical scattering of electromagnetic waves in slanted periodic gratings. Optics Communications, 189 4-6: 175-186.
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paper.pdf
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paper.pdf |
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| Author(s) |
Nieminen, T. A.
Gramotnev, D. K.
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| Title |
Rigorous analysis of extremely asymmetrical scattering of electromagnetic waves in slanted periodic gratings
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| Journal name |
Optics Communications
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| Publication date |
2001-01-01
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| Volume number |
189
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| Issue number |
4-6
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| ISSN |
0030-4018
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| Start page |
175
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| End page |
186
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| Total pages |
12
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| Place of publication |
Amsterdam
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| Publisher |
Elsevier Science Bv
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| Language |
eng
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| Subject |
240401 Optics and Opto-electronic Physics
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| Abstract |
Extremely asymmetrical scattering (EAS) is a new type of Bragg scattering in thick, slanted, periodic gratings. It is realised when the scattered wave propagates parallel to the front boundary of the grating. Its most important feature is the strong resonant increase in the scattered wave amplitude compared to the amplitude of the incident wave: the smaller the grating amplitude, the larger the amplitude of the scattered wave. In this paper, rigorous numerical analysis of EAS is carried out by means of the enhanced T-matrix algorithm. This includes investigation of harmonic generation inside and outside the grating, unusually strong edge effects, fast oscillations of the incident wave amplitude in the grating, etc. Comparison with the previously developed approximate theory is carried out. In particular, it is demonstrated that the applicability conditions for the two-wave approximation in the case of EAS are noticeably more restrictive than those for the conventional Bragg scattering. At the same time, it is shown that the approximate theory is usually highly accurate in terms of description of EAS in the most interesting cases of scattering with strong resonant increase of the scattered wave amplitude. Physical explanation of the predicted effects is presented.
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| Keyword(s) |
gratings
extremely asymmetrical scattering
scattered wave amplitude
Bragg gratings
ccattering
rigorous coupled wave theory
bulk optical waves
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| Additional Notes |
Originally published as T. A. Nieminen and D. K. Gramotnev (2001) Rigorous analysis of extremely asymmetrical scattering of electromagnetic waves in slanted periodic gratings, Optics Communications 189 (4-6): 175-186. Copyright 2001 Elsevier. All rights reserved.
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