Optical trapping and laser-spectroscopy measurements of single particles in air: a review

Wang, Chuji; Pan, Yong‐Le; Videen, Gorden

doi:10.1088/1361-6501/ac0acf

Cited by 36 publications

(12 citation statements)

References 229 publications

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“…Previously, quantitative measurements of atmospherically relevant reactions on levitated, solid particles were achieved by monitoring the time evolution of Raman signatures of the trapped particles [34][35][36] . Kinetics of evaporation, hydration and coagulation of levitated micro-droplets were studied in general by combining optical trapping with other optical techniques [37][38][39][40] . The approach presented here is amenable to in-situ simultaneous spectroscopic and precise physical properties measurements.…”

Section: Resultsmentioning

confidence: 99%

Orbital Dynamics at Atmospheric Pressure in a Lensed, Dual-beam, Optical Trap

Raj,

Schaich,

Dragnea

2022

Preprint

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Orbital optical trapping of a dielectric micro-particle in air was studied experimentally using a lensed, counter-propagating dual-beam trap, and by numerical simulations employing ray optics. The essential attributes of particle dynamics are evaluated as functions of the transverse offset between the beams, the axial offset between the laser foci and the total laser power, both experimentally and computationally. We find that the Q-factor of the orbital motion in this previously unexplored scheme is at least two orders of magnitude higher than values attainable with conventional trapping. Under our experimental conditions, silica micro-spheres orbit up to a maximum frequency of ∼ 2 kHz at atmospheric pressure, which can be further increased by increasing the optical power in the trap. With the help of simulations, we discuss how the experimental technique presented here can be further modified to enhance the Q factor of particle's orbital motion. The evolution of orbital frequencies can be a useful signature in analyzing the kinetics of deposition or loss of materials from the surface of levitated particles in a controlled environment. Hence, the approach reported here could find application

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Section: Resultsmentioning

confidence: 99%

Orbital Dynamics at Atmospheric Pressure in a Lensed, Dual-beam, Optical Trap

Raj,

Schaich,

Dragnea

2022

Preprint

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“…• Optical tweezers Raman spectroscopy (OTRS) [41] • Spatially offset Raman spectroscopy (SORS) [42] • Raman optical activity (ROA) [43] • Transmission Raman spectroscopy [44] • Micro-cavity substrates [45] • Remote Raman spectroscopy [46] • X-ray Raman scattering [47] Enhanced (or near-field) Raman • Coherent anti-Stokes Raman spectroscopy (CARS) [57] There is also morphologically directed Raman spectroscopy (MDRS), which combines the methods of automated particle imaging and Raman microspectroscopy into an integrated platform that allows detecting the chemical and morphological characteristics of individual components in a multi-component sample [58].…”

Section: Spontaneous (Or Far-field) Raman Spectroscopymentioning

confidence: 99%

Raman spectroscopic techniques for meat analysis: A review

Пчелкина

Чернуха

Fedulova

et al. 2022

Teor. prakt. pererab. mâsa (Print)

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Raman spectroscopy (vibrational spectroscopy) proved to be an effective analytical approach in the field of geology, semiconductors, materials and polymers. Over the past decade, Raman spectroscopy has attracted the attention of researchers as a non-destructive, highly sensitive, fast and eco-friendly method and has demonstrated the unique capabilities of food analysis. The use of Raman spectroscopic methods (RSMs) to assess the quality of meat and finished products is rapidly expanding. From the analysis of one sample, you can get a large amount of information about the structure of proteins, the composition of fatty acids, organoleptic parameters, autolysis and spoilage indicators, authentication of raw materials, technological properties. An important advantage of the method is the comparability of the results obtained with the data of traditional analytical methods. Traditional methods of determining the quality of meat are often time-consuming, expensive and lead to irreversible damage to a sample. It is difficult to use them in production conditions directly on the meat processing lines. Technological advances have made it possible to develop portable Raman spectroscopes to use directly in production. The article presents the basic principles of Raman spectroscopy, system atizes the results of the use of RSMs for the analysis of meat quality from different types of slaughter animals and provides tools for analyzing the data of the obtained spectra. Raman spectra have many dependent variables, so chemometric assays are used to work with them. Literature analysis has shown that currently there is no unified database of meat spectra in the world, standardized protocols for conducting research and processing the obtained results. In Russia, the use of RSMs is a new,

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“…In consequence, all these phenomena could be potentially harnessed for remote characterisation of composite microdroplets and diverse studies have been carried out in this field (see e.g. [2][3][4][5] for reviews). However, the interaction of light (scattering, luminescence) with composite microdroplets becomes much more complex than for a homogeneous sphere (described with Mie theory, see e.g.…”

Section: Introductionmentioning

confidence: 99%