Multiring pure-phase binary optical elements to extend depth of focus

Xu, Ning; Kong, Zhe; Tan, Qiaofeng; Fu, Yuegang

doi:10.1364/ao.57.009643

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…comparable, or even superior, optical performance to metalenses [22][23][24]. Fu with larger feature size, diffractive lenses are accessible to low-cost, large-are ume manufacturing.…”

Section: Designmentioning

confidence: 99%

“…Metalenses [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ] have great advantages in manipulating the phase, amplitude, and polarization of light, yet large-scale fabrication difficulties for functional devices are detrimental to practical applications [ 21 ]. Properly designed diffractive lenses provide comparable, or even superior, optical performance to metalenses [ 22 , 23 , 24 ]. Furthermore, with larger feature size, diffractive lenses are accessible to low-cost, large-area and -volume manufacturing.…”

Section: Introductionmentioning

confidence: 99%

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Diffractive Achromat with Freeform Slope for Broadband Imaging over a Long Focal Depth

Zhou

Hua

et al. 2023

Micromachines

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We propose a method for designing a long-focal-depth diffractive achromat (LFDA). By applying rotational symmetric parameterization, an LFDA with a diameter of 10.89 mm is designed over three wavelengths at six focal planes. The smoothly changed slope designed by the binary variable slope search (BVSS) algorithm greatly reduces the discontinuity in depth, thus it is a fabrication-friendly process for grayscale laser direct writing lithography, involving less fabrication error and cost. The deviation between the designed and fabricated profiles amounts to 9.68%. The LFDA operates at multiple wavelengths (654 nm, 545 nm, and 467 nm) with a DOF of 500 mm~7.65λ × 105 (λ = 654 nm). The simulated and measured full-width at half-maximum (FWHM) of the focused beam is close to the diffraction limit. Experimental studies suggest that the LFDA possesses a superior capability to form high-quality chromatic images in a wide range of depths of field. The LFDA opens a new avenue to achieve compact achromatic systems for imaging, sensing, and 3D display.

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“…comparable, or even superior, optical performance to metalenses [22][23][24]. Fu with larger feature size, diffractive lenses are accessible to low-cost, large-are ume manufacturing.…”

Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffractive Achromat with Freeform Slope for Broadband Imaging over a Long Focal Depth

Zhou

Hua

et al. 2023

Micromachines

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show abstract

“…As originally proposed by Toraldo di Francia [11], resolution enhancement can be achieved by pupil filtering techniques. Specifically, phase-only diffractive optical elements (DOEs) modulate the optical wavefront to generate custom diffraction patterns, with examples including extended depth of focus beams [14,15], axial multi-focus spots [16], super-resolution hollow beams [17], and magnification of the diffraction field [18]. DOEs can be used to reduce the focused spot size (or spot array) to smaller than the Abbe-Rayleigh diffraction limit [12,13,19,20].…”

Section: Introductionmentioning

confidence: 99%

Resolution-enhanced imaging for endoscopy using diffractive optics

Xu¹,

Williams²,

Spicer

et al. 2022

Advanced Optical Imaging Technologies V

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Optical endoscopy is indispensable for minimally-invasive medical diagnostics and therapeutics, whereby visualization of subtle changes in the structure of tissue can be used to identify disease. Adaptive real-time zoom functionality is highly desirable for resolving mucosal microvasculature, which when visualized can be used to improve diagnostic accuracy. Realizing this functionality in state-of-the-art miniaturized endoscopic imaging, such as chip-on-tip endoscopes, is challenging: conventional zoom objectives are bulky and existing chip-on-tip systems still have far from diffraction-limited performance. Point-scanning illumination approaches have been shown to improve imaging resolution by reducing the focused spot size. Typically, this higher resolution comes at the cost of low optical throughput (efficiency) and long acquisition times due to mechanical scanning requirements, thereby limiting applicability in clinical settings. In this work, we demonstrate an innovative Diffractive Optical Element (DOE) based optical imaging system for spatial resolution enhancement without mechanical scanning. Our imaging system is based on simultaneous utilization of a custom DOE and high-speed Digital Micromirror Device (DMD). The multi-level phase-only DOE produces a single super-resolution spot in the far-field while the DMD laterally scans the spot in the object plane at kHz rates. To demonstrate resolution enhancement with high-speed acquisition, we image a resolution test target and fluorescently labelled cells. In the future, through envisioned DOE-array integration in an endoscopic module, resolution enhancement (in an adaptive zoom-mode) can be achieved through illumination modulation alone without the need for separate systems.

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“…vortex phase plate method, 8) higher-order Bessel-Gaussian beams method, 9) orbital angular momentum beams method, 10,11) polarized modulation method, 12) and so forth), however, small spot size and long DOF, of particular importance for practical applications of hollow beams, have received limited attention in previous work. Benefiting from the flexibility of modulating the phase of beams, binary optical elements (BOEs) have been extensively used to generate various complex light fields, such as Bessel beams [13][14][15] and super-resolution spots, 16) which have been typically applied in many fields.…”

mentioning

confidence: 99%

Creation of super-resolution hollow beams with long depth of focus using binary optics

Liu

Kong

et al. 2019

Appl. Phys. Express

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In this letter, we propose a method for designing super-resolution hollow beams (SHBs) with long depth of focus (DOF) using an M-ring 0-π pure-phase binary optical element (BOE) and a focusing lens when a linearly polarized Bessel–Gaussian beam incident. We also introduce a custom-made method for SHBs with long DOF to iteratively obtain optimal 0-π phase distribution. Moreover, it is shown that the hollow beams can provide great flexibility by controlling spot size and DOF through adjustment of the BOE parameters, including different ring numbers and positions, and also have significant potential for particle trapping.

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Multiring pure-phase binary optical elements to extend depth of focus

Cited by 10 publications

References 25 publications

Diffractive Achromat with Freeform Slope for Broadband Imaging over a Long Focal Depth

Diffractive Achromat with Freeform Slope for Broadband Imaging over a Long Focal Depth

Resolution-enhanced imaging for endoscopy using diffractive optics

Creation of super-resolution hollow beams with long depth of focus using binary optics

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