Cross-differential dynamic microscopy

Arko, Matej; Petelin, Andrej

doi:10.1039/c9sm00121b

Cited by 13 publications

(12 citation statements)

References 16 publications

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“…The Cross-Differential Dynamic Microscopy method was setup as extensively described in reference [20] by Arko and Petelin. The setup comprises an infinitycorrected microscope objective with a 20× magnification, a 20 mm focal length tube lens followed by a beamsplitter, and two identical cameras (Flir BFS-U3-04S2C-CS with 6.9 μm pixel size and 1/3 inch sensor).…”

Section: Cross-differential Dynamic Microscopy (C-ddm)mentioning

confidence: 99%

“…The LED was operated in a pulsed regime with a low duty cycle to prevent sample heating, driven with a current of 5 A. Cameras were triggered as described in reference [20] to acquire two different sets of images with varying times of acquisition. Camera exposure time was 60 µs, and we set the shortest time delay between two consecutive frames on cameras to 256 µs.…”

Section: Cross-differential Dynamic Microscopy (C-ddm)mentioning

confidence: 99%

“…We investigate the switching behaviour in the predominant type of domains observed and reproduce it by means of a simplified model and Berreman calculations. The proposed uniform twist structure is finally faced with results from cross-Dynamic Differential Microscopy (c-DDM) [20], which indicate the presence of more complicated underlying twist. This paper is thus organised as follows.…”

Section: Introductionmentioning

confidence: 99%

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Electrooptics of mm-scale polar domains in the ferroelectric nematic phase

et al. 2021

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The recent discovery of the ferroelectric nematic phase has opened the door to experimental investigation of one of the most searched liquid crystal phases in decades, with high expectations for future applications. However, at this moment, there are more questions than answers. In this work, we examine the formation and structure of large polar nematic domains of the ferroelectric nematic material RM734 in planar liquid crystals cells with different aligning agents and specifications. We observe that confining surfaces have a strong influence over the formation of different types of domains, resulting in various twisted structures of the nematic director. For those cells predominantly showing mm-scale domains, we investigate the optical and second harmonic generation switching behaviour under applications of electric fields with a special focus on inplane fields perpendicular to the confinement media rubbing direction. In order to characterise the underlying structure, the polar optical switching behaviour is reproduced using a simplified model together with Berreman calculations.

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Section: Cross-differential Dynamic Microscopy (C-ddm)mentioning

confidence: 99%

Section: Cross-differential Dynamic Microscopy (C-ddm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrooptics of mm-scale polar domains in the ferroelectric nematic phase

et al. 2021

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“…The use of DDM as a diagnostic tool for quasi‐real‐time monitoring of samples during production, processing, transport or aging is fostered by the availability of optimized software implementations, enabling the quasi‐real time DDM analysis of an acquired image sequence 61 . Moreover, the continuous progress in imaging sensors technology and the introduction, in combination with DDM, of clever acquisition/illumination schemes will enable access to unprecedentedly fast dynamics 62,63 . DDM is robust against multiple scattering compared to DLS, and has been exploited by many investigators to study samples that would otherwise have been impossible with optical methods.…”

Section: Discussionmentioning

confidence: 99%

Differential dynamic microscopy for the characterization of polymer systems

Cerbino

Giavazzi

Helgeson

2021

Journal of Polymer Science

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This review summarizes recent progress in investigating polymer systems by using Differential dynamic microscopy (DDM), a rapidly emerging approach that transforms a commercial microscope by combining real-space information with the powerful capabilities of conventional light scattering analysis. DDM analysis of a single microscope movie gives access to the sample dynamics in a wide range of scattering wave-vectors, enabling contemporary polymer science experiments that would be difficult or impossible with standard light scattering techniques. Examples of application include the characterization of polymer solutions and networks, of polymer based colloidal systems, of biopolymers, and of cellular motility in polymeric fluids. Further applications of DDM to a variety of polymer systems are suggested to be just behind the corner and it is thus likely that DDM will become a tool of choice of the modern experimental polymer scientists.

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“…As one example, Germain et al investigate the dynamics of micron-sized colloids and bacteria and acquire images at both 400 Hz and 4 Hz 20 . This allows the authors to cover time scales from 2.5 ms to 1000 s. More recently, Arko and Petelin developed a dual-camera method to acquire DDM data over about 6 orders of magnitude in time 21 . Using a beam splitter they imaged their sample onto two separate cameras, each recording frames at 200 Hz.…”

mentioning

confidence: 99%

Two-color differential dynamic microscopy for capturing fast dynamics

You

McGorty

2021

Review of Scientific Instruments

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Differential dynamic microscopy (DDM) is increasingly used in the fields of soft matter physics and biophysics to extract the dynamics of microscopic objects across a range of wavevectors using optical microscopy. Standard DDM is limited to detecting dynamics no faster than the camera frame rate. We report on an extension to DDM where we sequentially illuminate the sample with spectrallydistinct light and image with a color camera. By pulsing blue and then red light separated by a lag time much smaller than the camera's exposure time we are able to use this two-color DDM method to measure dynamics occurring much faster than the camera frame rate. The following article has been accepted by Review of Scientific Instruments. After it is published, it will be found at https://aip.scitation.org/journal/rsi.

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Cross-differential dynamic microscopy

Abstract: We demonstrate the use of a dual-camera-equipped microscope for the study of the wavevector-dependent dynamics of soft matter.

Cited by 13 publications

References 16 publications

Electrooptics of mm-scale polar domains in the ferroelectric nematic phase

Electrooptics of mm-scale polar domains in the ferroelectric nematic phase

Differential dynamic microscopy for the characterization of polymer systems

Two-color differential dynamic microscopy for capturing fast dynamics

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