Axial Multifocus Beams Formed by Binary Optical Elements

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

doi:10.1109/jphot.2019.2901269

Cited by 8 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Binary optical element (BOE) plays an important role in optical design and manufacture. With the development of the process, at present, BOE is designed in a more diversified way [8,9]. However, quality testing of BOE is required before it is used.…”

Section: Introductionmentioning

confidence: 99%

Variable-ratio lateral-shearing interferometry with a vortex-splitting grating

yong

mengyu

dawei

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

View full text Add to dashboard Cite

Lateral Shearing Interferometer (LSI), as a kind of self-interference technology, can achieve high-precision wavefront sensing and phase imaging. Quadriwave Lateral Shearing Interferometry (QWLSI) divides the wavefront into four transverse dislocated beams by a checkerboard phase grating. The lateral-shearing interferogram of the four waves occurs on the image plane, and then the test wavefront is reconstructed. The reconstruction precision is determined by the shear ratio, thus the variable shear ratio can meet the requirement of the different measurement accuracy. Here we proposed variable-ratio lateral-shearing interferometry with a vortex-splitting grating. Different from the checkerboard grating, topological charge is first encoded into grating and is then optimized to obtain two shear ratios in the same interference setup. The proposed variable-ratio lateral-shearing setup including of only an axial motion device is robust, effective and variable precision for wavefront sensing.

show abstract

Section: Introductionmentioning

confidence: 99%

Variable-ratio lateral-shearing interferometry with a vortex-splitting grating

yong

mengyu

dawei

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

View full text Add to dashboard Cite

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

View full text Add to dashboard Cite

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.

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Axial Multifocus Beams Formed by Binary Optical Elements

Cited by 8 publications

References 22 publications

Variable-ratio lateral-shearing interferometry with a vortex-splitting grating

Variable-ratio lateral-shearing interferometry with a vortex-splitting grating

Resolution-enhanced imaging for endoscopy using diffractive optics

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

Contact Info

Product

Resources

About