Inverse designed flat optics with multilevel diffractive lenses

Sourangsu Banerji; Monjurul Meem; Apratim Majumder; Juan C. Garcia; Philip Hon; Christian Pies; Timo Oberbiermann; Rajesh Menon; Berardi Sensale Rodriguez

doi:10.1117/12.2568141

21 August 2020 Inverse designed flat optics with multilevel diffractive lenses

Sourangsu Banerji, Monjurul Meem, Apratim Majumder, Juan C. Garcia, Philip Hon, Christian Pies, Timo Oberbiermann, Rajesh Menon, Berardi Sensale Rodriguez

Author Affiliations +

Proceedings Volume 11482, Current Developments in Lens Design and Optical Engineering XXI; 114820H (2020) https://doi.org/10.1117/12.2568141
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

In conventional imaging, the information transfer from the object to the image plane is accomplished either with the help of a traditional lens that performs a one-to-one mapping or an unconventional lens that performs a one-to-many mapping. In the first case, the image is formed directly, whereas in the second case, the image is formed after a computation. The conventional lens approach is preferred in most cases due to the high signal-to-noise ratio achievable at each image pixel. By appealing to the fact that for most of the imaging applications, it is only the intensity, which is measured by the detector, the phase of the field in the image or focal plane is a free parameter, something that comes from the inverse diffraction transform. Therefore, it is easy to visualize that this phase of the plane wave after it transmits the lens can have multiple forms. Hence, the final choice can be made based upon specific application tailored requirements like achromaticity, depth-of-focus, wide-angle imaging, etc. This concept was exploited to design an achromatic MDL via inverse design across almost the entire electromagnetic spectrum (λ = 450 nm to 15 μm). Furthermore, a MDL with a Field Of View (FOV) up to 50° for wide-angle imaging as well as a MDL to enable an extreme Depth of Focus (EDOF) imaging of up to 6 m in the NIR were also designed.

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Sourangsu Banerji, Monjurul Meem, Apratim Majumder, Juan C. Garcia, Philip Hon, Christian Pies, Timo Oberbiermann, Rajesh Menon, and Berardi Sensale Rodriguez "Inverse designed flat optics with multilevel diffractive lenses", Proc. SPIE 11482, Current Developments in Lens Design and Optical Engineering XXI, 114820H (21 August 2020); https://doi.org/10.1117/12.2568141

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