Implementation of a Large-Area Diffractive Lens Using Multiple Sub-Aperture Diffractive Lenses and Computational Reconstruction

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dc.contributor.authorGopinath, Shivasubramanian
dc.contributor.authorAngamuthu, Praveen Periysamy
dc.contributor.authorKahro, Tauno
dc.contributor.authorBleahu, Andrei
dc.contributor.authorArockiaraj, Francis Gracy
dc.contributor.authorSmith, Daniel
dc.contributor.authorHock Ng, Soon
dc.contributor.authorJuodkazis, Saulius
dc.contributor.authorKukli, Kaupo
dc.contributor.authorTamm, Aile
dc.contributor.authorAnand, Vijayakumar
dc.date.accessioned2024-03-28T07:57:32Z
dc.date.available2024-03-28T07:57:32Z
dc.date.issued2023
dc.description.abstractDirect imaging systems that create an image of an object directly on the sensor in a single step are prone to many constraints, as a perfect image is required to be recorded within this step. In designing high resolution direct imaging systems with a diffractive lens, the outermost zone width either reaches the lithography limit or the diffraction limit itself, imposing challenges in fabrication. However, if the imaging mode is switched to an indirect one consisting of multiple steps to complete imaging, then different possibilities open. One such method is the widely used indirect imaging method with Golay configuration telescopes. In this study, a Golay-like configuration has been adapted to realize a large-area diffractive lens with three sub-aperture diffractive lenses. The sub-aperture diffractive lenses are not required to collect light and focus them to a single point as in a direct imaging system, but to focus independently on different points within the sensor area. This approach of a Large-Area Diffractive lens with Integrated Sub-Apertures (LADISA) relaxes the fabrication constraints and allows the sub-aperture diffractive elements to have a larger outermost zone width and a smaller area. The diffractive sub-apertures were manufactured using photolithography. The fabricated diffractive element was implemented in indirect imaging mode using non-linear reconstruction and the Lucy–Richardson–Rosen algorithm with synthesized point spread functions. The computational optical experiments revealed improved optical and computational imaging resolutions compared to previous studies.
dc.identifier.urihttps://doi.org/10.3390/photonics10010003
dc.identifier.urihttps://hdl.handle.net/10062/97409
dc.language.isoen
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/857627///CIPHR
dc.relation.ispartofPhotonics 2023, 10, 3.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectdiffractive lens
dc.subjectimaging
dc.subjectLucy–Richardson–Rosen algorithm
dc.subjectholography
dc.subjectincoherent imaging
dc.subjecttelescope
dc.subjectphotolithography
dc.subjectcomputational imaging
dc.titleImplementation of a Large-Area Diffractive Lens Using Multiple Sub-Aperture Diffractive Lenses and Computational Reconstruction
dc.typeinfo:eu-repo/semantics/articleen

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