Characterization and correction of spherical aberration due to glass substrate in the design and fabrication of Fresnel zone lenses

Anand, Vijayakumar; Bhattacharya, Subhashish

doi:10.1364/ao.52.005932

Cited by 19 publications

(16 citation statements)

References 23 publications

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“…The first Fresnel zone lens (FZL 1 ) is designed for infinite conjugate mode with a focal length f =z 1 , which is the distance between the object plane and the RMBDL and so the incident object wave is collimated by FZL 1 . The second Fresnel zone lens (FZL 2 ) is designed for finite conjugate mode with u = z 1 and v = z 2 /2 22 . The object wave is focused by FZL 2 at z 2 /2 from the RMBDL.…”

Section: Design Of Rmbdlmentioning

confidence: 99%

“…The second Fresnel zone lens (FZL2) is designed for finite conjugate mode with u = z1 and v = z2/2. 19 The object wave is focused by FZL2 at z2/2 from the RMBDL. The hologram is recorded approximately at z2 from the RMBDL, where the two beams have roughly the same diameter and are perfectly overlapped.…”

Section: Design Of Rmbdlmentioning

confidence: 99%

“…Earlier studies indicated that the exclusion of the thickness and refractive index of glass plates introduces substantial spherical aberration into the system resulting in a variation in the focal distances and blurring of the focal spot. 19 Two techniques have been proposed to avoid the spherical aberration.…”

Section: Design Of Rmbdlmentioning

confidence: 99%

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Fresnel incoherent correlation holography with single camera shot

Anand

Katkus

Lundgaard

et al. 2020

Opto-Electronic Advances

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Fresnel incoherent correlation holography (FINCH) is a self-interference based super-resolution three-dimensional imaging technique. FINCH in inline configuration requires an active phase modulator to record at least three phase-shifted camera shots to reconstruct objects without twin image and bias terms. In this study, FINCH is realized using a randomly multiplexed bifocal binary diffractive Fresnel zone lenses fabricated using electron beam lithography. The object space is calibrated by axially scanning a point object along the optical axis and recording the corresponding point spread holograms (PSHs). An object is mounted within the calibrated object space, and the object hologram was recorded under identical experimental conditions used for recording the PSHs. The image of the object at different depths was reconstructed by a cross-correlation between the object hologram and the PSHs. Application potential including bio-medical optics is discussed.

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Section: Design Of Rmbdlmentioning

confidence: 99%

Section: Design Of Rmbdlmentioning

confidence: 99%

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Fresnel incoherent correlation holography with single camera shot

Anand

Katkus

Lundgaard

et al. 2020

Opto-Electronic Advances

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“…The test samples for the study were fabricated using electron beam lithography (EBL; Raith 150 2 , Dortmund, Germany) [ 42 , 43 , 44 ] in PMMA 950K(MicroChemicals GmbH Nicolaus-Otto-Str. 39 D-89079, Ulm, Germany) resist on indium tin oxide (ITO) glass substrates with 1.1 mm thickness.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Lensless Three-Dimensional Quantitative Phase Imaging Using Phase Retrieval Algorithm

et al. 2020

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Quantitative phase imaging (QPI) techniques are widely used for the label-free examining of transparent biological samples. QPI techniques can be broadly classified into interference-based and interferenceless methods. The interferometric methods which record the complex amplitude are usually bulky with many optical components and use coherent illumination. The interferenceless approaches which need only the intensity distribution and works using phase retrieval algorithms have gained attention as they require lesser resources, cost, space and can work with incoherent illumination. With rapid developments in computational optical techniques and deep learning, QPI has reached new levels of applications. In this tutorial, we discuss one of the basic optical configurations of a lensless QPI technique based on the phase-retrieval algorithm. Simulative studies on QPI of thin, thick, and greyscale phase objects with assistive pseudo-codes and computational codes in Octave is provided. Binary phase samples with positive and negative resist profiles were fabricated using lithography, and a single plane and two plane phase objects were constructed. Light diffracted from a point object is modulated by phase samples and the corresponding intensity patterns are recorded. The phase retrieval approach is applied for 2D and 3D phase reconstructions. Commented codes in Octave for image acquisition and automation using a web camera in an open source operating system are provided.

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“…Lensless imaging systems can offer aberration free imaging and, in particular, to solve problems associated with the manufacturing of objective lenses for telescopes and microscopes. 21,22 This technique can be a benefit for telescopic and microscopy systems for visible as well as non-visible wavelengths for which fabrication of lenses and creating interference are challenging tasks. Lensless and interferenceless imaging systems have been already proposed by Chi et.al.…”

Section: Introductionmentioning

confidence: 99%

Incoherent digital holograms acquired by interferenceless coded aperture correlation holography system without refractive lenses

Kumar

Anand

Rosen

2017

Sci Rep

Self Cite

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We present a lensless, interferenceless incoherent digital holography technique based on the principle of coded aperture correlation holography. The acquired digital hologram by this technique contains a three-dimensional image of some observed scene. Light diffracted by a point object (pinhole) is modulated using a random-like coded phase mask (CPM) and the intensity pattern is recorded and composed as a point spread hologram (PSH). A library of PSHs is created using the same CPM by moving the pinhole to all possible axial locations. Intensity diffracted through the same CPM from an object placed within the axial limits of the PSH library is recorded by a digital camera. The recorded intensity this time is composed as the object hologram. The image of the object at any axial plane is reconstructed by cross-correlating the object hologram with the corresponding component of the PSH library. The reconstruction noise attached to the image is suppressed by various methods. The reconstruction results of multiplane and thick objects by this technique are compared with regular lens-based imaging.

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Characterization and correction of spherical aberration due to glass substrate in the design and fabrication of Fresnel zone lenses

Cited by 19 publications

References 23 publications

Fresnel incoherent correlation holography with single camera shot

Fresnel incoherent correlation holography with single camera shot

Lensless Three-Dimensional Quantitative Phase Imaging Using Phase Retrieval Algorithm

Incoherent digital holograms acquired by interferenceless coded aperture correlation holography system without refractive lenses

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