Sector-based Fresnel zone plate with extended depth of focus

Torcal-Milla, Francisco José; Sanchez‐Brea, Luis Miguel; Gómez‐Pedrero, José A.

doi:10.1016/j.optlastec.2022.108294

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…Using the long DOF achievable with current FZPs, the HA scheme allows for an extension of imaging volume with SXT. The potential use of sector‐based FZPs with an even longer DOF [ 68 ] and automatic alignment for a HA scheme could allow extending the imaging volume beyond the 18 μm demonstrated in this work. Measuring samples thicker than 18 μm calls for consideration on the spectral purity of the beamline and effect of higher‐order light on X‐ray absorption.…”

Section: Discussionmentioning

confidence: 99%

Extending Imaging Volume in Soft X‐Ray Tomography

Ekman

Chen

Vanslembrouck

et al. 2023

Advanced Photonics Research

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Section: Discussionmentioning

confidence: 99%

Extending Imaging Volume in Soft X‐Ray Tomography

Ekman

Chen

Vanslembrouck

et al. 2023

Advanced Photonics Research

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“…As a consequence, sectorized Fresnel zone plate (SFZP) was proposed, which also includes a quadratic and cubic variation of its focal length. 12 In this work, we propose a general angular diffractive lens, which focal variation is based on a Fourier series. As the degrees of freedom increase, we develop an optimization process to obtain the appropriate Fourier coefficients that generate a narrow, uniform and elongated focus.…”

Section: Introductionmentioning

confidence: 99%

Angular extended depth-of-focus diffractive lens based on Fourier series

Soria-Garcia,

Sanchez-Brea,

del Hoyo

et al. 2023

Digital Optical Technologies 2023

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Extended depth-of-focus (EDOF) diffractive lenses produce a narrow and long focusing region which have many applications on microscopy, laser focusing or contact and intraocular lenses. Several designs have been proposed to achieve EDOF by angularly modulating the focal length. Nevertheless, when the focus is highly elongated, some undesired intensity fluctuations are produced. To solve this problem, we have generalized this type of lenses by defining their focal length as a Fourier series. Moreover, we have used Particle Swarm Optimization algorithm to optimize its Fourier series coefficients and generate an enhanced design. The performance of our Fourier Series Diffractive Lens (FSDL) is parameterized through the Full Width at Half Maximum (FWHM) of the beam and the uniformity of the intensity along the optical axis. Our results prove that the FSDL beam on the focal region is narrower and much more uniform than previous EDOF designs, showing the enhancement of the proposed EDOF lens.

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