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(a) Configuration and (b) equivalent circuit of the grating “beam splitter.” (dimensions; , , and , refractive index; , , and , and refraction angle; at ) (c) Configuration of double-sided grating with the switching capability [interlayer thickness; , and grating dimensions; same as 1(a)].
(a) Diffraction efficiency and (b) coupling coefficient of the grating beam splitter as a function of refractive index of grating at 600 nm operating wavelength. [Solid line and dashed line are obtained using the modal analysis. The single dots (shown as a “circle” and a “square”) are the results of the CST Microwave Studio™ simulation.]
Snapshot (in time) of the electric field distributions at 600 nm operating wavelength. The electric field is normalized to the maximum value in each figure. (a) The layer with the top grating has the semi-infinite thickness. (b) The interlayer with the top grating has a finite thickness of . The top and bottom gratings have (c) the shift of a quarter period, and (d) no shift in the horizontal direction.
Diffraction efficiency of the transmission in the double-sided grating for the quarter-period shift and no shift.
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