Effective Fresnel diffraction field extension of diffractive optical elements with plane wave incidence

Kong, Zhe; Xu, Ning; Xiao, Huan; Tan, Qiaofeng

doi:10.1364/ao.387646

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…To enhance the diffraction angle capabilities of DOEs, numerous solutions have been proposed. One such example is the approach introduced by Kong's group, which enlarges the diffraction angle of the Fresnel field through the introduction of an intermediate plane and the utilization of a two-step diffraction calculation [222] . By applying zero-padding to the DOE plane, the sampling interval on the intermediate plane is reduced, resulting in an effective extension of the size of the Fresnel diffraction field when illuminated with a plane wave, as visually depicted in Fig.…”

Section: Diffraction Angle Enlargement By Plane Wavementioning

confidence: 99%

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Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Zhang,

He,

Xie

et al. 2023

Photonics Insights

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Diffractive optical elements (DOEs) are intricately designed devices with the purpose of manipulating light fields by precisely modifying their wavefronts. The concept of DOEs has its origins dating back to 1948 when D. Gabor first introduced holography. Subsequently, researchers introduced binary optical elements (BOEs), including computer-generated holograms (CGHs), as a distinct category within the realm of DOEs. This was the first revolution in optical devices. The next major breakthrough in light field manipulation occurred during the early 21st century, marked by the advent of metamaterials and metasurfaces. Metasurfaces are particularly appealing due to their ultra-thin, ultra-compact properties and their capacity to exert precise control over virtually every aspect of light fields, including amplitude, phase, polarization, wavelength/frequency, angular momentum, etc. The advancement of light field manipulation with micro/nano-structures has also enabled various applications in fields such as information acquisition, transmission, storage, processing, and display. In this review, we cover the fundamental science, cuttingedge technologies, and wide-ranging applications associated with micro/nano-scale optical devices for regulating light fields. We also delve into the prevailing challenges in the pursuit of developing viable technology for real-world applications. Furthermore, we offer insights into potential future research trends and directions within the realm of light field manipulation.

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Section: Diffraction Angle Enlargement By Plane Wavementioning

confidence: 99%

“…(b) Experimental results when α=1.5 (top) and α=1.6 (bottom). The sizes of corresponding Fresnel diffraction fields are 38.9 mm×38.9 mm and 41.5 mm×41.5 mm, respectively [222] .…”

Section: Light Field Manipulation Technologiesmentioning

confidence: 99%

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Zhang,

He,

Xie

et al. 2023

Photonics Insights

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“…The Airy spot size is ≈0.9λf/D, which is defined as the full-width at halfmaximum (FWHM) [25]. To obtain finer details, the sampling intervals in the focal plane are reduced to λf/D/8 by gradual zero-padding [26]. To maximize the optical efficiency with a smaller spot size, the amplitude constraints in the DOE plane and the focal plane are modified.…”

Section: Doe Design For a Super-resolution Spotmentioning

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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“…Tan et al 31 proposed a hybrid algorithm merging hill-climbing with simulated annealing to control more sampling points. Kong et al 32 proposed a gradual zero-padding algorithm based on the GS algorithm, which alleviates the zero-amplitude limit at the zero-padded point in the iteration to control more sampling points effectively. 33 Qu et al 34 proposed a modified zeropadding algorithm by improving the limit of iterative amplitude to reduce the sampling interval on the output plane.…”

Section: Introductionmentioning

confidence: 99%

“…proposed a hybrid algorithm merging hill-climbing with simulated annealing to control more sampling points. Kong et al 32 . proposed a gradual zero-padding algorithm based on the GS algorithm, which alleviates the zero-amplitude limit at the zero-padded point in the iteration to control more sampling points effectively 33 .…”

Section: Introductionmentioning

confidence: 99%

Speckle-reduced diffractive optical elements beam shaping with regional padding algorithm

Guo

Cai

et al. 2022

Opt. Eng.

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Diffractive optical elements (DOEs) have been widely used to realize beam shaping.However, the speckle noise always appears in the reshaped beam, which induces beam quality degradation. We proposed a regional padding algorithm based on the Gerchberg-Saxton algorithm to implement speckle-reduced beam shaping. A variable region is set in the DOE to iterate and optimize the phase of each part DOE. Zero padding is used around the DOE to decrease the sampling interval on the output plane. When the region expands and padded value reduction is controlled slowly, more sampling points on the output plane can be optimized effectively and suppress speckle noise. Numerical simulations and optical experiments have been performed to verify the feasibility of the proposed method.

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Effective Fresnel diffraction field extension of diffractive optical elements with plane wave incidence

Cited by 7 publications

References 19 publications

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Resolution-enhanced imaging for endoscopy using diffractive optics

Speckle-reduced diffractive optical elements beam shaping with regional padding algorithm

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