Theory of Crossed Gratings

In this chapter we will consider the theoretical analysis and the properties of doubly periodic diffraction gratings (“bigratings”). Our interest in these structures has been stimulated by two factors. Firstly, their theoretical study represents a natural extension of previous work on mono-periodic structures. Secondly, HORWITZ [7.1] suggested the use of metallic grids as selective filters (heat mirrors) in solar energy absorption. Of course such devices have application in far infrared spectroscopy as beam splitters [7.2], filters [7.3–5] and the reflecting elements in Fabry-Perot interferometers [7.5–10]. Similar applications exist in the field of microwave engineering [7.11.13].

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