Abstract
The effect of the refractive index of the substrate together with the incident polarization on the optimization of sawtooth surface-relief gratings (SRGs) is investigated. The global optimum diffraction efficiencies of the forward-diffracted order of sawtooth SRGs are occurring at for TE polarization and occurring at for TM polarization. Incident TE polarization has higher optimum diffraction efficiency than TM polarization for all . In contrast, TM polarization has higher optimum diffraction efficiency than TE polarization for all . A polymer optimum sawtooth SRG exhibits efficiency for TE polarization. A silicon optimum sawtooth SRG exhibits efficiency for TM polarization. These sawtooth SRGs are compared to right-angle-face trapezoidal SRGs. It is found that the optimum profiles of right-angle-face trapezoidal SRGs have only very slightly increased efficiencies over sawtooth SRGs for TE and for TM).
© 2006 Optical Society of America
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