Far-field perfect imaging with time-modulated gratings
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Title
Far-field perfect imaging with time-modulated gratingsDate
2022-06-22Publisher
American Physical SocietyISSN
2331-7019Bibliographic citation
Packo, P., & Torrent, D. (2022). Far-field Perfect Imaging with Time Modulated Gratings. Phys. Rev. Applied 17, 064040Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
We study the capabilities of time-modulated diffraction gratings as imaging devices. It is shown that a time-dependent but transversally homogeneous slab can be used to make a perfect image of an object in the far-field, ... [+]
We study the capabilities of time-modulated diffraction gratings as imaging devices. It is shown that a time-dependent but transversally homogeneous slab can be used to make a perfect image of an object in the far-field, since all the evanescent modes couple to propagative time-diffracted orders. It is found that, if the image to be obtained is axially symmetric, it can be recovered by measuring the time signal at a single point, without the need to perform a spatial scan, so that time gratings can act as well as single-pixel imaging devices. In the case of having an object without axial symmetry, the time grating can be combined with a spatial grating, and then the full image can be recovered again with a measurement at a single point. We apply the theory of compressive sensing to optimize the recovery method, and numerical examples are provided. We show, therefore, that time-modulated gratings can be used to perfectly recover the image of an object in the far-field and after measuring at a single point in space, making them a promising approach to superresolution and ultrafast imaging. [-]
Is part of
Physical Review Applied, 17 (2022)Funder Name
Ministerio de Ciencia, Innovación y Universidades | National Science Centre (Poland) | European Union
Project code
2018/31/B/ST8/00753 | RTI2018-093921-A-C42 | 101046489
Project title or grant
DYNAMO project
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info:eu-repo/semantics/openAccess
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