Digital holography for observing aerosol particles undergoing Brownian motion in microgravity conditions

Prodi, F.; Santachiara, Gianni; Travaini, S.; Belosi, Franco; Vedernikov, Andrei Alexeievitch; Dubois, Frank; Queeckers, Patrick; Legros, Jean Claude

doi:10.1016/j.atmosres.2005.12.010

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…Consequently, their temporal resolution is reduced to milliseconds or seconds during which the particle must be quasi-immobile. As an alternative, digital holography (DH) provides the particle's 3D morphology [30][31][32] and 3D position 33 from each measured hologram because the reconstruction can be done at any arbitrary imaging plane 34 . DH can also measure the 6D motion of nonspherical objects (3D for the position and 3D for the rotation) suspended in liquid 33,35,36 or in air 25 .…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative, digital holography (DH) provides the particle's 3D morphology [30][31][32] and 3D position 33 from each measured hologram because the reconstruction can be done at any arbitrary imaging plane 34 . DH can also measure the 6D motion of nonspherical objects (3D for the position and 3D for the rotation) suspended in liquid 33,35,36 or in air 25 . In addition, holography is very well suited to image fast moving objects, such as an aerosol particle, because the imaged particle only needs to be quasi-immobile during the duration of the exposure time of each hologram, typically several 10 ns for pulsed lasers 37 and about 10 μs for continuous lasers 38 .…”

Section: Introductionmentioning

confidence: 99%

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Morphology and motion of single optically trapped aerosol particles from digital holography

David

Esat

Thanopulos

et al. 2018

Optical Trapping and Optical Micromanipulation XV

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Nonspherical particles play a key role in the atmosphere by affecting processes such as radiative forcing, photochemistry, new particle formation and phase transitions. In this context, measurements on single particles proved to be very useful for detailed investigations of the properties of the particles studied and of processes affecting them. However, measurements on single nonspherical particles are limited by the difficulties and lack of understanding associated with the optical trapping of such particles. Here, we aim at better understanding the optical trapping of nonspherical particles in air by comparing the motion of an observed nonspherical particle with simulated optical forces and torques. An holographic microscope is used to retrieve the 6D motion of a trapped peanut-shaped particle (3D for translation and 3D for rotation). Optical forces and torques exerted by the optical trap on the peanut-shaped particle are calculated by using FDTD simulations. Most of the main features of the particle motion are in agreement with the calculations while some specific aspects of the particle motion cannot yet be explained.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology and motion of single optically trapped aerosol particles from digital holography

David

Esat

Thanopulos

et al. 2018

Optical Trapping and Optical Micromanipulation XV

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“…To retrieve an image, the recorded interference pattern, referred to as hologram, is numerically reconstructed using a Kirchhoff-Helmholtz or Fourier transform 33,34 . The 3D morphology [35][36][37] and the 3D position 38 of an object is obtained from reconstructions at different image planes. DH is very well suited to image fast moving objects, such as aerosol particles, because the imaged particles only need to be quasi-immobile during the exposure time of each hologram, which typically is several 10 ns for pulsed lasers 34 and about 10 μs for continuous lasers 39 .…”

mentioning

confidence: 99%

“…To date, most of the holographic imaging setups have been used to study objects (such as cells or particles) deposited on a substrate 42,43 or suspended in liquids 35,39,41,[44][45][46] . Corresponding investigations of aerosol particles suspended in air are less common and usually limited to particles of several microns in size 34,38,[47][48][49] , likely because aerosol particles are more difficult to image. Central issues with aerosol holography are the fast particle motion in air because of the low damping and the reduced spatial image resolution because of the low refractive index of air.…”

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confidence: 99%

Digital holography of optically-trapped aerosol particles

David

Esat

Thanopulos³

et al. 2018

Commun Chem

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Many processes taking place in atmospheric aerosol particles are accompanied by changes in the particles' morphology (size and shape), with potentially significant impact on weather and climate. However, the characterization of dynamic information on particle morphology and position over multiple time scales from microseconds to days under atmospherically relevant conditions has proven very challenging. Here we introduce holographic imaging of unsupported aerosol particles in air that are spatially confined by optical traps. Optical trapping in air allows contact-free observation of aerosol particles under relevant conditions and provides access to extended observation times, while the digital in-line holographic microscope provides six-dimensional spatial maps of particle positions and orientations with maximum spatial resolution in the sub-micron range and a temporal resolution of 240 μs. We demonstrate the broad applicability of our approach for a few examples and discuss its prospects for future aerosol studies, including the study of complex, multi-step phase transitions.

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“…Apart from the biological applications, the current method is also suitable for performing digital phase conjugation for the imaging of nanoparticles while correcting the aberrations introduced by a turbid medium [32]. We also expect applications in the area of investigating 3D particle distribution and motions, such as observing aerosol particles undergoing Brownian motion, which allows direct measurement of particle size and distribution [33]. Such processes demand both high spatial and temporal resolutions from the imaging system, which can be provided by this method.…”

Section: Resultsmentioning

confidence: 99%

Quantitative phase microscopy using dual-plane in-line digital holography

Das¹,

Yelleswarapu²,

Rao³

2012

Appl. Opt.

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We present detailed theoretical evaluation and thorough experimental investigation of quantitative phase imaging using our previously demonstrated dual-plane in-line digital holographic microscopy technique [Opt. Lett. 35, 3426 (2010)]. This evaluation is based on the recording of two interferograms at slightly different planes and numerically reconstructing the object information. The zero-order diffracted wave is eliminated by using the method of subtraction of average intensity of the entire hologram, and the twin-image diffracted wave is removed by Fourier domain processing of the two recorded holograms. Experiments are performed using controlled amplitude and phase objects and human muscle cells to demonstrate the potential of this technique.

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Digital holography for observing aerosol particles undergoing Brownian motion in microgravity conditions

Cited by 9 publications

References 3 publications

Morphology and motion of single optically trapped aerosol particles from digital holography

Morphology and motion of single optically trapped aerosol particles from digital holography

Digital holography of optically-trapped aerosol particles

Quantitative phase microscopy using dual-plane in-line digital holography

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