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Contreras, T.; Martins, A.; Stanford, C.; Escobar, C.O.; Guenette, R.; Stancari, M.; Martin-Albo, J.; Lawrence-Sanderson, B.; Para, A.; Kish, A.; Kellerer, F. |
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Title |
A method to characterize metalenses for light collection applications |
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2023 |
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Journal of Instrumentation |
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J. Instrum. |
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18 |
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9 |
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T09004 - 11pp |
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Metalenses and metasurfaces are promising emerging technologies that could improve light collection in light collection detectors, concentrating light on small area photodetectors such as silicon photomultipliers. Here we present a detailed method to characterize metalenses to assess their efficiency at concentrating monochromatic light coming from a wide range of incidence angles, not taking into account their imaging quality. |
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yes |
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yes |
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IFIC @ pastor @ |
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6086 |
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Author |
Martins, A.; da Mota, A.F.; Stanford, C.; Contreras, T.; Martin-Albo, J.; Kish, A.; Escobar, C.O.; Para, A.; Guenette, R. |
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Title |
Simple strategy for the simulation of axially symmetric large-area metasurfaces |
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Journal Article |
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Year |
2024 |
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Journal of the Optical Society of America B |
Abbreviated Journal |
J. Opt. Soc. Am. B |
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41 |
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5 |
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1261-1269 |
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Metalenses are composed of nanostructures for focusing light and have been widely explored in many exciting applications. However, their expanding dimensions pose simulation challenges. We propose a method to simulate metalenses in a timely manner using vectorial wave and ray tracing models. We sample the metalens's radial phase gradient and locally approximate the phase profile by a linear phase response. Each sampling point is modeled as a binary blazed grating, employing the chosen nanostructure, to build a transfer function set. The metalens transmission or reflection is then obtained by applying the corresponding transfer function to the incoming field on the regions surrounding each sampling point. Fourier optics is used to calculate the scattered fields under arbitrary illumination for the vectorial wave method, and a Monte Carlo algorithm is used in the ray tracing formalism. We validated our method against finite -difference time domain simulations at 632 nm, and we were able to simulate metalenses larger than 3000 wavelengths in diameter on a personal computer. |
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[Martins, Augusto; Guenette, Roxanne] Univ Manchester, Dept Phys, Manchester M13 9PL, England, Email: augusto.martins@york.ac.uk |
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Optica Publishing Group |
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English |
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0740-3224 |
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WOS:001237140900001 |
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no |
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yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
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6140 |
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Martins, A.; Contreras, T.; Stanford, C.; Tuzi, M.; Martin-Albo, J.; Escobar, C.O.; Para, A.; Kish, A.; Park, J.S.; Krauss, T.F.; Guenette, R. |
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Title |
High efficiency glass-based VUV metasurfaces |
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Journal Article |
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Year |
2025 |
Publication |
Optica |
Abbreviated Journal |
Optica |
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12 |
Issue |
10 |
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1681-1688 |
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Most advances in metaoptics have been made at visible wavelengths and above; in contrast, the vacuum ultraviolet (VUV) has barely been explored despite numerous scientific and technological opportunities. Creating metaoptic elements at this short wavelength is challenging due to the scarcity of VUV transparent materials and the small sizes of the required nanostructures. Here, we present the first transmissive VUV (175 nm) metalens. By using UV-grade silica and trading off the Nyquist requirement for subwavelength structures against feasibility of the fabrication process, we achieve a step-change in diffraction efficiencies for wavelengths shorter than 300 nm. Our large numerical aperture (NA = 0.5) metalens shows an average diffraction efficiency of (53.3 +/- 1.4)%. This demonstration opens up new avenues for compact flat optic systems operating in the VUV range. |
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[Martins, Augusto; Krauss, Thomas F.] Univ York, Sch Phys Engn & Technol, York YO10 5DD, England, Email: augusto.martins@york.ac.uk |
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Optica Publishing Group |
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English |
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2334-2536 |
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WOS:001604747900015 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6912 |
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