{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,6,7]],"date-time":"2024-06-07T10:33:34Z","timestamp":1717756414622},"reference-count":45,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,20]],"date-time":"2023-04-20T00:00:00Z","timestamp":1681948800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council","doi-asserted-by":"publisher","award":["313158"],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"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 2\u03c0 is accessed by varying the geometry of these scattering structures. The full 2\u03c0 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.<\/jats:p>","DOI":"10.3390\/s23084137","type":"journal-article","created":{"date-parts":[[2023,4,21]],"date-time":"2023-04-21T06:05:31Z","timestamp":1682057131000},"page":"4137","source":"Crossref","is-referenced-by-count":2,"title":["Silicon Fresnel Zone Plate Metalens with Subwavelength Gratings"],"prefix":"10.3390","volume":"23","author":[{"given":"William","family":"Fraser","sequence":"first","affiliation":[{"name":"Silicon Micro\/NanoPhotonics Group, Carleton University, Ottawa, ON K1S 5B6, Canada"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-2817-4531","authenticated-orcid":false,"given":"Winnie N.","family":"Ye","sequence":"additional","affiliation":[{"name":"Silicon Micro\/NanoPhotonics Group, Carleton University, Ottawa, ON K1S 5B6, Canada"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1038\/nmat3839","article-title":"Flat optics with designer metasurfaces","volume":"13","author":"Yu","year":"2014","journal-title":"Nat. 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