Analysis of diffraction processes in gratings

Pavel Fiala; Ivan Richter; Zbynek Ryzi

doi:10.1117/12.353051

14 July 1999 Analysis of diffraction processes in gratings

Pavel Fiala, Ivan Richter, Zbynek Ryzi

Proceedings Volume 3820, 11th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; (1999) https://doi.org/10.1117/12.353051
Event: Eleventh Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 1998, Stara Lesna, Slovakia

Abstract

This paper concentrates on theoretical studies of diffraction process in periodic diffractive structures-- gratings. Its contribution can be seen on several levels: it reviews the terminology and different approaches of diffraction methods, presents a new form of diffraction process characterization (described by the diffraction efficiency), and discusses five regions with typical diffraction regimes. In more detail, this contribution analyses the mechanisms during the diffraction process in terms of phase synchronisms, and distinguishes between angular, transversal and Bragg (volume) phase synchronisms. Using such terminology, diffraction regions are discussed in more detail. The case of Bragg diffraction is treated by both an approximate (Kogelnik's method) and a rigorous method (rigorous coupled-wave analysis-RCWA), and these two methods are compared. Properties of high-spatial frequency gratings are summarized, and resonant regions, characterized by strong resonant processes, are introduced. Finally, three different methods for the analysis of diffraction gratings are reviewed: RCWA, Kogelnik's approximate method, and approximate methods of transmittance function. The review of basic transmittance methods is made (primitive, modified), and a different approach (TCWA-transmittance coupled-wave analysis) is presented.

Citation Download Citation

Pavel Fiala, Ivan Richter, and Zbynek Ryzi "Analysis of diffraction processes in gratings", Proc. SPIE 3820, 11th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, (14 July 1999); https://doi.org/10.1117/12.353051

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