Browsing by Author "Xia, J."
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Item Switchable large-aperture liquid-crystal diffractive lenses(Natl Inst Optoelectronics, 2017) Xia, J.; Demirer, Mutlu; Uludağ Üniversitesi/Mühendislik Fakültesi/Elektrik-Elektronik Mühendisliği Bölümü.; 57195473676Switchable large aperture liquid crystal Fresnel diffractive lenses with aperture diameters of 20-30 mm were designed, fabricated, and demonstrated experimentally with multiple 2 pi radian phase modulation in each Fresnel zone. The structure design with multiple 2 pi radian phase modulation in each Fresnel zone can reduce difficulty in micro-fabrication of the lenses. The influence of electrode gaps of Fresnel lenses on their diffraction efficiencies was examined by numerical analysis. The lenses showed fast switching speed, low driving voltages (<2 V), and high diffraction efficiencies (>62%). They have potential to be applied for autofocus imaging devices and adaptive optics system.