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Optimization of sawtooth surface-relief gratings: effects of substrate refractive index and polarization
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 Ϫ1st forward-diffracted order of sawtooth SRGs are 63.3% occurring at n 2 ϭ 1.47 for TE polarization and 73.8% occurring at n 2 ϭ 2.88 for TM polarization. Incident TE polarization has higher optimum diffraction efficiency than TM polarization for all n 2 Ͻ 1.85. In contrast,doi:10.1364/ao.45.003420 pmid:16708085 fatcat:x34mgo36jvholc7czain27oruu