2021
Moein, S.; Suleski, T. J.
Freeform optics for variable extended depth of field imaging Journal Article
In: Optics Express, vol. 29, no. 24, pp. 40524-40537, 2021.
Abstract | Links | BibTeX | Tags: CeFO, CeFO design, imaging
@article{Moein2021-2,
title = {Freeform optics for variable extended depth of field imaging },
author = {S. Moein and T. J. Suleski},
url = {https://opg.optica.org/oe/fulltext.cfm?uri=oe-29-24-40524&id=464994},
year = {2021},
date = {2021-11-19},
urldate = {2021-11-19},
journal = {Optics Express},
volume = {29},
number = {24},
pages = {40524-40537},
abstract = {Imaging depth of field is shallow in applications with high magnification and high numerical aperture, such as microscopy, resulting in images with in- and out-of-focus regions. Therefore, methods to extend depth of field are of particular interest. Researchers have previously shown the advantages of using freeform components to extend depth of field, with each optical system requiring a specially designed phase plate. In this paper we present a method to enable extended depth-of-field imaging for a range of numerical apertures using freeform phase plates to create variable cubic wavefronts. The concept is similar to an Alvarez lens which creates variable spherical wavefronts through the relative translation of two transmissive elements with XY polynomial surfaces. We discuss design and optimization methods to enable extended depth of field for lenses with different numerical aperture values by considering through-focus variation of the point spread function and compare on- and off-axis performance through multiple metrics.},
keywords = {CeFO, CeFO design, imaging},
pubstate = {published},
tppubtype = {article}
}
Imaging depth of field is shallow in applications with high magnification and high numerical aperture, such as microscopy, resulting in images with in- and out-of-focus regions. Therefore, methods to extend depth of field are of particular interest. Researchers have previously shown the advantages of using freeform components to extend depth of field, with each optical system requiring a specially designed phase plate. In this paper we present a method to enable extended depth-of-field imaging for a range of numerical apertures using freeform phase plates to create variable cubic wavefronts. The concept is similar to an Alvarez lens which creates variable spherical wavefronts through the relative translation of two transmissive elements with XY polynomial surfaces. We discuss design and optimization methods to enable extended depth of field for lenses with different numerical aperture values by considering through-focus variation of the point spread function and compare on- and off-axis performance through multiple metrics.
Moein, S.; Suleski, T. J.
Position tolerancing of freeform phase plates for variable extended depth of field imaging Proceedings
2021, ISBN: 978-1-943580-88-0, (From the session Joint Freeform and IODC III (JTh3A)).
Abstract | Links | BibTeX | Tags: CeFO, CeFO design, imaging, Tolerancing
@proceedings{Moein2021-1,
title = {Position tolerancing of freeform phase plates for variable extended depth of field imaging },
author = {S. Moein and T. J. Suleski},
url = {https://opg.optica.org/abstract.cfm?URI=FLATOPTICS-2021-JTh3A.3},
isbn = {978-1-943580-88-0},
year = {2021},
date = {2021-07-01},
urldate = {2021-07-01},
abstract = {We discuss and analyze the sensitivity to misalignment errors of a freeform phase plate pair designed to enable variable extended depth of field imaging. Methods and impacts of the errors on system performance are demonstrated.},
note = {From the session
Joint Freeform and IODC III (JTh3A)},
keywords = {CeFO, CeFO design, imaging, Tolerancing},
pubstate = {published},
tppubtype = {proceedings}
}
We discuss and analyze the sensitivity to misalignment errors of a freeform phase plate pair designed to enable variable extended depth of field imaging. Methods and impacts of the errors on system performance are demonstrated.
2020
Moein, S.; Suleski, T. J.
Variable extended depth of field imaging using freeform optics Proceedings
vol. Proc. SPIE 11483, no. 114830G, 2020.
Links | BibTeX | Tags: CeFO, CeFO design, imaging
@proceedings{Moein2020a,
title = {Variable extended depth of field imaging using freeform optics},
author = {S. Moein and T. J. Suleski },
editor = {SPIE},
url = {https://doi.org/10.1117/12.2568723},
doi = {10.1117/12.2568723},
year = {2020},
date = {2020-08-21},
volume = {Proc. SPIE 11483},
number = {114830G},
keywords = {CeFO, CeFO design, imaging},
pubstate = {published},
tppubtype = {proceedings}
}
2019
Moein, S.; Suleski, T. J.
Design of Freeform Phase Plate Pairs for Variable Extended Depth of Field in Imaging Systems Proceedings Article
In: Optical Design and Fabrication 2019 (Freeform, OFT), pp. FW4B.2, OSA 2019.
Links | BibTeX | Tags: CeFO, CeFO design, imaging
@inproceedings{Moein2019,
title = {Design of Freeform Phase Plate Pairs for Variable Extended Depth of Field in Imaging Systems},
author = {S. Moein and T. J. Suleski},
url = {https://doi.org/10.1364/FREEFORM.2019.FW4B.2},
doi = {https://doi.org/10.1364/FREEFORM.2019.FW4B.2},
year = {2019},
date = {2019-06-12},
booktitle = {Optical Design and Fabrication 2019 (Freeform, OFT)},
pages = {FW4B.2},
organization = {OSA},
keywords = {CeFO, CeFO design, imaging},
pubstate = {published},
tppubtype = {inproceedings}
}
2017
Liang, Kevin; Alonso, Miguel A.
Effects of defocus and other quadratic errors on OTF Journal Article Forthcoming
In: Optics Letters, vol. 42, no. 24, pp. 5254-5257, Forthcoming.
Abstract | Links | BibTeX | Tags: aberrations, CeFO, design, imaging
@article{AlonsoLiangOL17,
title = {Effects of defocus and other quadratic errors on OTF},
author = {Kevin Liang and Miguel A. Alonso},
url = {https://www.osapublishing.org/ol/upcoming.cfm},
year = {2017},
date = {2017-12-12},
journal = {Optics Letters},
volume = {42},
number = {24},
pages = {5254-5257},
abstract = {Even for the simplest nontrivial aberration, defocus, and for a circular pupil, there is no theoretical closed-form expression for the optical transfer function (OTF). By using a simple approximation for the error at the pupil, we provide a simple yet accurate approximation for the OTF of a defocused system. We then generalize this approach to generic quadratic aberrations, including astigmatism.},
keywords = {aberrations, CeFO, design, imaging},
pubstate = {forthcoming},
tppubtype = {article}
}
Even for the simplest nontrivial aberration, defocus, and for a circular pupil, there is no theoretical closed-form expression for the optical transfer function (OTF). By using a simple approximation for the error at the pupil, we provide a simple yet accurate approximation for the OTF of a defocused system. We then generalize this approach to generic quadratic aberrations, including astigmatism.