Achromatic phase retarder by slanted illumination of a dielectric grating with period comparable with the wavelength

摘要: We discuss some properties of dielectric gratings with period comparable the illuminating wavelength for slanted illumination (this geometry is often referred to as concical mounting). demonstrate usefulness such an geometry. show that threshold (under which only zeroth transmission and reflection orders are nonevanescent) can be significantly higher, thereby easing fabrication constraints, this setup makes it possible design achromatic phase retarders. Such a design, quarter-wave plate λ/60 uniformity retardation in 0.47–0.63-µm interval, demonstrated.