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• W2783158515 abstract "Axicon lenses are versatile optical elements that can convert Gaussian beams to Bessel-like beams. In this letter, we demonstrate that axicons operating with high efficiencies and at large angles can be produced using high-contrast, multilayer gratings made from silicon. Efficient beam deflection of incident monochromatic light is enabled by higher-order optical modes in the silicon structure. Compared to diffractive devices made from low-contrast materials such as silicon dioxide, our multilayer devices have a relatively low spatial profile, reducing shadowing effects and enabling high efficiencies at large deflection angles. In addition, the feature sizes of these structures are relatively large, making the fabrication of near-infrared devices accessible with conventional optical lithography. Experimental lenses with deflection angles as large as 40° display field profiles that agree well with theory. Our concept can be used to design optical elements that produce higher-order Bessel-like beams, and the combination of high-contrast materials with multilayer architectures will more generally enable new classes of diffractive photonic structures." @default.
• W2783158515 created "2018-01-26" @default.
• W2783158515 creator A5021451612 @default.
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• W2783158515 date "2018-01-01" @default.
• W2783158515 modified "2023-09-27" @default.
• W2783158515 title "High-performance axicon lenses based on high-contrast, multilayer gratings" @default.
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• W2783158515 doi "https://doi.org/10.1063/1.5009760" @default.
• W2783158515 hasPublicationYear "2018" @default.
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