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- W4366773682 abstract "Metalenses are planar optical components that have demonstrated immense potential for integrated optics. In particular, they are capable of high-efficiency subwavelength focusing without the bulkiness of traditional lenses. Dielectric metalenses operating in the C-band typically employ relatively tall, amorphous silicon structures arranged in a periodic array. Phase control spanning from 0 to 2π is accessed by varying the geometry of these scattering structures. The full 2π phase range is necessary to impose a hyperbolic focusing phase profile, but this is difficult to achieve without custom fabrication practices. In this work, we propose a binary phase Fresnel zone plate metalens designed for the standard 500 nm silicon-on-insulator platform. Our design uses subwavelength gratings with trapezoidal segmentation to form concentric rings. The effective index of the grating is set with the duty cycle using a single full-etch step to form the binary phase profile of the zone plate. The metalens design can be easily tuned to achieve longer focal lengths at different wavelengths. It offers a simple platform for high-throughput wavelength-scale focusing elements in free-space optics, including for microscopy and medical imaging." @default.
- W4366773682 created "2023-04-25" @default.
- W4366773682 creator A5008362233 @default.
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- W4366773682 date "2023-04-20" @default.
- W4366773682 modified "2023-09-30" @default.
- W4366773682 title "Silicon Fresnel Zone Plate Metalens with Subwavelength Gratings" @default.
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- W4366773682 doi "https://doi.org/10.3390/s23084137" @default.
- W4366773682 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37112476" @default.
- W4366773682 hasPublicationYear "2023" @default.
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