Figure 4


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Design of two-way beam splitters. (a) Optimum values of the fill factor f (red) and the relief depth h/λ0 (blue) as a function of the exit angle of the first diffracted order in TE polarization. (b) The corresponding first-order diffraction efficiency η+1,0 = η−1,0 (black), the efficiency η0,0 of the zeroth transmitted order (red), and that of the zeroth reflected order (blue), which is 1 − 2η+1,0 − η0,0 due to energy conservation. The inset shows the grating structure and direction of illumination.

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