A Novel Optical Scanning Technique with an Inclined Focusing Plane

Alexandrov, A.; Lellis, G. De; Tioukov, V.

doi:10.1038/s41598-019-39415-8

Cited by 27 publications

(11 citation statements)

References 20 publications

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“…The latter will not only permit to analyze all polarization angles simultaneously, but also will allow to use the white light illumination to extend the analysis to multiple wavelengths. The simultaneous acquisition of polarization images will make the microscope insensitive to vibrations and will enable application of novel scanning techniques 22 , 23 , dramatically boosting the readout speed.…”

Section: Discussionmentioning

confidence: 99%

Super-resolution high-speed optical microscopy for fully automated readout of metallic nanoparticles and nanostructures

Alexandrov

Asada

Lellis

et al. 2020

Sci Rep

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We have designed a fully automated optical microscope running at high-speed and achieving a very high spatial resolution. In order to overcome the resolution limit of optical microscopes, it exploits the localized surface plasmon resonance phenomenon. The customized setup using a polarization analyzer, based on liquid crystals, produces no vibrations and it is capable of probing isolated nanoparticles. We tested its performance with an automated readout using a fine-grained nuclear emulsion sample exposed to 60 keV carbon ion beam and, for the first time, successfully reconstructed the directional information from ultra-short tracks produced by such low-energetic ions using a solid-state tracking detector.

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Section: Discussionmentioning

confidence: 99%

Super-resolution high-speed optical microscopy for fully automated readout of metallic nanoparticles and nanostructures

Alexandrov

Asada

Lellis

et al. 2020

Sci Rep

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“…Asama volcano 2 . Recent developments of even faster scanning systems operating in a wide angular range 35,67–69 further extends the applications area for this technique.…”

Section: Methodsmentioning

confidence: 99%

First muography of Stromboli volcano

Tioukov

Alexandrov

Bozza

et al. 2019

Sci Rep

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Muography consists in observing the differential absorption of muons – elementary particles produced through cosmic-ray interactions in the Earth atmosphere – going through the volcano and can attain a spatial resolution of tens of meters. We present here the first experiment of nuclear emulsion muography at the Stromboli volcano. Muons have been recorded during a period of five months by a detector of 0.96 m 2 area. The emulsion films were prepared at the Gran Sasso underground laboratory and were analyzed at Napoli, Salerno and Tokyo scanning laboratories. Our results highlight a significant low-density zone at the summit of the volcano with density contrast of 30–40% with respect to bedrock. The structural setting of this part of the volcanic edifice controls the eruptive dynamics and the stability of the “Sciara del Fuoco” slope, which is affected by recurrent tsunamigenic landslides. Periodical imaging of the summit of the Stromboli volcano such as that provided by muography can become a useful method for studying the evolution of the internal structure of the volcanic edifice.

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“…The analysis of NIT emulsions is performed with a two-step approach: a fast scanning with a state-of-the-art resolution for the signal preselection followed by a pin-point check of preselected candidates with unprecedented nanometric resolution to further enhance the signal to noise ratio. An R&D program has improved by orders of magnitude the scanning speed [7][8][9] when compared to the OPERA systems [10]. The starting point of the emulsion scanning is the image analysis to collect clusters making up silver grains.…”

Section: Optical Microscope Read-out Systemmentioning

confidence: 99%

Nuclear Emulsions for WIMP Search with a directional measurement

Lellis¹

2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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The nature of dark matter (DM) is one of the most relevant open problems both in cosmology and in particle physics. Many different experimental techniques have been developed to detect Weakly Interactive Massive Particles (WIMPs) as dark matter candidates via their scattering with detector atoms. The NEWSdm experiment, located in the Gran Sasso underground laboratory in Italy, is based on a novel nuclear emulsion technology with nanometric resolution and new emulsion scanning microscopy that can detect recoil track lengths shorter than one hundred nanometers. NEWSdm is able to reconstruct the direction of the nucleus recoiling, thus being capable of confirming the Galactic origin of the dark matter. We discuss the potentiality, both in terms of exclusion limits and discovery potential, of a directional experiment based on the use of a solid target made by newly developed nuclear emulsions and read-out systems reaching nanometric resolution. We also report the technological achievements and the measurement plan at Gran Sasso.

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A Novel Optical Scanning Technique with an Inclined Focusing Plane

Cited by 27 publications

References 20 publications

Super-resolution high-speed optical microscopy for fully automated readout of metallic nanoparticles and nanostructures

Super-resolution high-speed optical microscopy for fully automated readout of metallic nanoparticles and nanostructures

First muography of Stromboli volcano

Nuclear Emulsions for WIMP Search with a directional measurement

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