Resolution enhancement phase-contrast imaging by microsphere digital holography

Wang, Yunxin; Guo, Sha; Wang, Dayong; Lin, Qiaowen; Rong, Lü; Zhao, Jie

doi:10.1016/j.optcom.2015.12.031

Cited by 33 publications

(19 citation statements)

References 33 publications

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“…Thus, if only the refractive index or thickness of phase object varies across transverse dimensions, then by using an ordinary microscope it will not be able to observe such object. Such an object can be viewed through what is known as phase contrast microscopy [29]. Imaging of phase objects is especially important for biological systems [27,41].…”

Section: :405mentioning

confidence: 99%

Nano-jet related to Bessel beams and to super-resolutions in microsphere optical experiments

Ben‐Aryeh

2017

EPJ Techn Instrum

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The appearance of a Nano-jet in the microsphere optical experiments is analyzed by relating this effect to non-diffracting Bessel beams. By inserting a circular aperture with a radius of subwavelength dimension in the EM waist, and sending the transmitted light into a confocal microscope, the EM oscillations by the different Bessel beams are avoided. On this constant EM field evanescent waves are superposed. While this effect improves the optical-depth of the imaging process, the object fine-structures are obtained, from the modulation of the EM fields by the evanescent waves. The use of a combination of the microsphere optical system with an interferometer for phase contrast measurements is described.

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Section: :405mentioning

confidence: 99%

Nano-jet related to Bessel beams and to super-resolutions in microsphere optical experiments

Ben‐Aryeh

2017

EPJ Techn Instrum

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“…There is, however, interesting work in which microsphere digital holographic approach is presented which realizes phase contrast imaging [30]. The optical system is designed by combining the microsphere optics with the image digital holography.…”

Section: Phase Contrast Interferomater With a Microspherementioning

confidence: 99%

Increase of resolution by use of microspheres related to complex Snell’s law

Ben‐Aryeh¹

2016

J. Opt. Soc. Am. A

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The increase of resolution by the use of microspheres is related to the use of evanescent waves satisfying complex Snell's law with complex trigonometric functions related to the incident and refracted angles, while the refractive indices are real. The evanescent waves are obtained in addition to initial propagating waves satisfying the ordinary Snell's law. The lateral spatial wave vectors of the evanescent waves, which include information on the object fine structures, are converted at the microsphere surface to smaller wave vectors. Due to the reduction in the magnitudes of the spatial wave vectors of the evanescent waves, they become propagating waves including the fine structures which are recovered in the image plane.

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“…In cells and biological tissues, only changes in the thickness of objects and refraction index can be observed by phasecontrast measurements. Digital holography for quantitative phase-contrast imaging was developed, in which numerical hologram reconstruction was described [104,105] and these methods were applied for phase-contrast imaging by microspheres [106,107]. Microsphereassisted super-resolved Mirau digital holographic-microscopy has also been attempted [108,109].…”

Section: Interference Of Evanescent Waves (Converted To Propagating Wmentioning

confidence: 99%

Super-Resolution of Nano-Materials and Quantum Effects Obtained by Microspheres

Ben‐Aryeh¹

2019

rpm

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In this article, microsphere super-resolution, which are beyond the Abbe classical limit, are described. The conversion of evanescent waves into propagating waves is analyzed by using the geometry of the microsphere. In microsphere experiments, a nanojet is produced near the focal plane, where its width is smaller than the Abbe limit and remains unchanged in the axial direction for certain wavelengths. The interference between the evanescent waves being converted into propagating waves and the nanojet leads to an increase in light intensity and confinement effects in the focal plane. However, the nanojet is not the main source of the super-resolution as the fine structures are available mainly in the evanescent waves. Quantum effects for super-resolution are obtained from special properties of the evanescent waves leading to an uncertainty relation. Several methods to increase the phase contrast in microsphere experiments have been described, which can be used for phase object measurements. Plasmon interaction can be used for measuring fine structures of special systems and for converting evanescent waves into propagating waves but they might also change the optical image in a way which is difficult to analyze. Therefore, most microsphere high-resolution experiments were conducted without plasmon interactions.

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Resolution enhancement phase-contrast imaging by microsphere digital holography

Cited by 33 publications

References 33 publications

Nano-jet related to Bessel beams and to super-resolutions in microsphere optical experiments

Nano-jet related to Bessel beams and to super-resolutions in microsphere optical experiments

Increase of resolution by use of microspheres related to complex Snell’s law

Super-Resolution of Nano-Materials and Quantum Effects Obtained by Microspheres

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