TY - JOUR
T1 - Design of binary phase filters for depth-of-focus extension via binarization of axisymmetric aberrations
AU - Ryu, Suho
AU - Joo, Chulmin
N1 - Publisher Copyright:
© 2017 Optical Society of America.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/11/27
Y1 - 2017/11/27
N2 - We present a novel design approach for a binary phase mask with depth-of-focus (DoF) extension ability. Our method considers that the binarized version of an axisymmetric continuous phase pupil generates twin-intensity profiles that are symmetric with respect to the focal plane, each of which resembles the focal behavior of its continuous original. The DoF extension is realized by repositioning and coherently summing the twin foci to achieve an elongated focus along the axial direction. The shift of the two foci towards the focal plane can be handled by superimposing the defocus term in the continuous pupil function. We demonstrate our proposed design approach for two representative axisymmetric aberration functions, i.e., defocused phase axicon and spherical aberration. The manipulation of topological parameters in the phase axicon and spherical aberration, along with the defocus strength, enables the multiple binary phase-filter designs of DoF extension of 3.2–7.1 fold with a phase axicon and 2.8–14.8 fold with a spherical aberration, compared to the case with a clear aperture.
AB - We present a novel design approach for a binary phase mask with depth-of-focus (DoF) extension ability. Our method considers that the binarized version of an axisymmetric continuous phase pupil generates twin-intensity profiles that are symmetric with respect to the focal plane, each of which resembles the focal behavior of its continuous original. The DoF extension is realized by repositioning and coherently summing the twin foci to achieve an elongated focus along the axial direction. The shift of the two foci towards the focal plane can be handled by superimposing the defocus term in the continuous pupil function. We demonstrate our proposed design approach for two representative axisymmetric aberration functions, i.e., defocused phase axicon and spherical aberration. The manipulation of topological parameters in the phase axicon and spherical aberration, along with the defocus strength, enables the multiple binary phase-filter designs of DoF extension of 3.2–7.1 fold with a phase axicon and 2.8–14.8 fold with a spherical aberration, compared to the case with a clear aperture.
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U2 - 10.1364/OE.25.030312
DO - 10.1364/OE.25.030312
M3 - Article
C2 - 29221061
AN - SCOPUS:85036462087
VL - 25
SP - 30312
EP - 30326
JO - Optics Express
JF - Optics Express
SN - 1094-4087
IS - 24
ER -