Superresolution observed from evanescent waves transmitted through nano-corrugated metallic films

Ben‐Aryeh, Y.

doi:10.1007/s00340-012-5193-4

Cited by 24 publications

(20 citation statements)

References 18 publications

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“…This is indicated by our simulation results mentioned earlier. Moreover, from the evanescent waves analysis reported by Ben-Aryeh [ 25 ], surfaces that have larger angles with the sample’s surface can convert evanescent waves at higher spatial frequencies into propagating waves. However, for a spherical shape, surfaces that have larger angles with the sample are farther away from the sample’s surface; thus, due to the exponential decay of evanescent waves, the transmitted evanescent waves will have a much weaker intensity.…”

Section: Resultsmentioning

confidence: 99%

Super-Resolution Real Imaging in Microsphere-Assisted Microscopy

Lai

Wang

et al. 2016

PLoS ONE

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Microsphere-assisted microscopy has received a lot of attention recently due to its simplicity and its capability to surpass the diffraction limit. However, to date, sub-diffraction-limit features have only been observed in virtual images formed through the microspheres. We show that it is possible to form real, super-resolution images using high-refractive index microspheres. Also, we report on how changes to a microsphere’s refractive index and size affect image formation and planes. The relationship between the focus position and the additional magnification factor is also investigated using experimental and theoretical methods. We demonstrate that such a real imaging mode, combined with the use of larger microspheres, can enlarge sub-diffraction-limit features up to 10 times that of wide-field microscopy’s magnification with a field-of-view diameter of up to 9 μm.

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Section: Resultsmentioning

confidence: 99%

Super-Resolution Real Imaging in Microsphere-Assisted Microscopy

Lai

Wang

et al. 2016

PLoS ONE

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“…Despite imaging occurring in the far field, it has been proposed that the SR effect of PNJs has a strong near-field component [ 41 , 42 ]. To further understand this phenomenon, simulations were performed for both 14 and 60 µm diameter spheres using Gaussian beam illumination with a numerical aperture (NA) of 1.2 as used in experiments.…”

Section: Resultsmentioning

confidence: 99%

Superresolved polarization-enhanced second-harmonic generation for direct imaging of nanoscale changes in collagen architecture

Johnson

Karvounis

Singh

et al. 2021

Optica

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Superresolution (SR) optical microscopy has allowed the investigation of many biological structures below the diffraction limit; however, most of the techniques are hampered by the need for fluorescent labels. Nonlinear label-free techniques such as second-harmonic generation (SHG) provide structurally specific contrast without the addition of exogenous labels, allowing observation of unperturbed biological systems. We use the photonic nanojet (PNJ) phenomena to achieve SR-SHG. A resolution of with respect to the fundamental wavelength, that is, a -fold improvement over conventional or diffraction-limited SHG under the same imaging conditions is achieved. Crucially we find that the polarization properties of excitation are maintained in a PNJ. This is observed in experiment and simulations. This may have widespread implications to increase sensitivity by detection of polarization-resolved SHG by observing anisotropy in signals. These new, to the best of our knowledge, findings allowed us to visualize biological SHG-active structures such as collagen at an unprecedented and previously unresolvable spatial scale. Moreover, we demonstrate that the use of an array of self-assembled high-index spheres overcomes the issue of a limited field of view for such a method, allowing PNJ-assisted SR-SHG to be used over a large area. Dysregulation of collagen at the nanoscale occurs in many diseases and is an underlying cause in diseases such as lung fibrosis. Here we demonstrate that pSR-SHG allows unprecedented observation of changes at the nanoscale that are invisible by conventional diffraction-limited SHG imaging. The ability to nondestructively image SHG-active biological structures without labels at the nanoscale with a relatively simple optical method heralds the promise of a new tool to understand biological phenomena and drive drug discovery.

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“…The evanescent wave is transformed into the propagating wave under the condition that The different properties of high resolution related to the above analysis have been discussed in previous works [58,59] including the relation between the radius of the microsphere and the super-resolution. The use of microsphere as a tip detector for increasing the resolution by using scanning near-field optical microscopy (SNOM) of evanescent waves was related to complex Snell's law [58,59].…”

Section: Conversion Of Evanescent Waves Into Propagating Wavesmentioning

confidence: 99%

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

Ben‐Aryeh¹

2019

rpm

Self Cite

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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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Superresolution observed from evanescent waves transmitted through nano-corrugated metallic films

Cited by 24 publications

References 18 publications

Super-Resolution Real Imaging in Microsphere-Assisted Microscopy

Super-Resolution Real Imaging in Microsphere-Assisted Microscopy

Superresolved polarization-enhanced second-harmonic generation for direct imaging of nanoscale changes in collagen architecture

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

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