Preprint

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

Shivasubramanian GopinathInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaP. PraveenInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaTauno KahroInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaAndrei BleahuInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaFrancis Gracy ArockiarajInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaDaniel SmithOptical Sciences Center, Swinburne University of Technology, Melbourne 3122, AustraliaSoon Hock NgOptical Sciences Center, Swinburne University of Technology, Melbourne 3122, AustraliaSaulius JuodkazisOptical Sciences Center, Swinburne University of Technology, Melbourne 3122, AustraliaKaupo KukliInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaAile TammInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, EstoniaVijayakumar AnandInstitute of Physics, University of Tartu, W. Ostwaldi str. 1, 50411 Tartu, Estonia

2022en

ABI

Annotatsiya

Direct 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 up. One such methods 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 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 smaller area. The diffractive sub-apertures were manufactured using photolithography. The fabricated diffractive element has been implemented in indirect imaging mode using non-linear reconstruction and Lucy-Richardson-Rosen algorithm with synthesized point spread functions. The computational optical experiments revealed an improved optical and computational imaging resolutions compared to previous studies.

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Identifikatorlar

DOI: 10.20944/preprints202211.0281.v1

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