Determination of the size and composition of multicomponent ethanol/water droplets by cavity-enhanced Raman scattering

Hopkins, Rachel; Symes, Rachel; Sayer, Robert M.; Reid, Jonathan P.

doi:10.1016/j.cplett.2003.09.048

Cited by 38 publications

(61 citation statements)

References 26 publications

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“…The technique was successfully used in the study of ethanol-water droplets falling at ambient temperature and pressure in air by stimulating both CH and OH stretching bands for ethanol and water, respectively. The ratio between the integrated intensity of CERS signal coming from water and ethanol was found to decease by half, while the ethanol volume fraction decreased by only 0.6 % (Hopkins et al 2003). This provided highly accurate composition measurements of the composition change (Fig.…”

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

“…The technique is called cavity-enhanced Raman scattering (CERS) and was initiated by Hopkins et al (2003). It is also referred to as surface-enhanced Raman scattering (SERS) in the particular case of droplets.…”

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

“…Stimulated Raman can be exploited to characterize the composition of multicomponent droplets, in particular ethanol-water droplets (Homer et al 2009;Hopkins and Reid 2005;Hopkins et al 2003;Howle et al 2007;Reid et al 2007). The technique is called cavity-enhanced Raman scattering (CERS) and was initiated by Hopkins et al (2003).…”

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

“…where I(CERS,k) is the CERS signal at wavelength k, S(k) is the spontaneous Raman scattering intensity at the same wavelength and g is the cavity gain factor (Hopkins et al 2003). This gain is proportional to the molecular number concentration of scatterers and the intensity of incident light trapped into the WGM.…”

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

See 3 more Smart Citations

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

2013

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Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

Section: Stimulated Raman Scattering Spectroscopymentioning

confidence: 99%

See 2 more Smart Citations

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

2013

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“…The phase function was dependent on the refractive index, the incident wavelength, and the particle size. Accordingly, the phase function could be utilized to calculate the particle diameter (Chang and Biswas, 1992;Gatherer et al, 2002;Hopkins et al, 2003;Mitchem et al, 2006;Symes et al, 2006;Davies et al, 2012;Haddrell et al, 2013). In addition, the chemical composition or mixing state of particle could influence the refractive index, size, and density, which in sequence directly affect their optical properties (Liu and Mishchenko, 2007;Gangl et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Measurement and Evaluation of Elastic Light Scattering from a Single Levitated Irregular Particle

Kao

Huang

Chen

et al. 2017

Aerosol Air Qual. Res.

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This study introduced a convenient experimental method to measure and to evaluate the elastic light scattering from a single irregular particle. The particle levitation system was used to trap a particle and to maintain the particle at null position by utilizing electrodynamic balance. Moreover, the Raman spectroscopy was applied to observe the light scattering of a single particle. The influences of relative humidity on optical properties of particle were also discussed. For comparison with experimental results, the classical Lorenz-Mie theory was employed to compute the phase function of a single particle. The experimental results demonstrated that the measurements of light scattering were in approximate trend with the model. In particular, numerical simulation results showed that the scattering intensity was underestimated in backward scattering directions. Consequently, the effect of surface roughness and irregular morphology of particle might be resulted in deviations of backward scattering. Besides, the experiments suggested that while using the weighted average method to estimate the refractive index might cause some significant deviations of light scattering between measuring and modeling.

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Optical Microresonators for Sensing and Transduction: A Materials Perspective

et al. 2017

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Optical microresonators confine light to a particular microscale trajectory, are exquisitely sensitive to their microenvironment, and offer convenient readout of their optical properties. Taken together, this is an immensely attractive combination that makes optical microresonators highly effective as sensors and transducers. Meanwhile, advances in material science, fabrication techniques, and photonic sensing strategies endow optical microresonators with new functionalities, unique transduction mechanisms, and in some cases, unparalleled sensitivities. In this progress report, the operating principles of these sensors are reviewed, and different methods of signal transduction are evaluated. Examples are shown of how choice of materials must be suited to the analyte, and how innovations in fabrication and sensing are coupled together in a mutually reinforcing cycle. A tremendously broad range of capabilities of microresonator sensors is described, from electric and magnetic field sensing to mechanical sensing, from single-molecule detection to imaging and spectroscopy, from operation at high vacuum to in live cells. Emerging sensing capabilities are highlighted and put into context in the field. Future directions are imagined, where the diverse capabilities laid out are combined and advances in scalability and integration are implemented, leading to the creation of a sensor unparalleled in sensitivity and information content.

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Determination of the size and composition of multicomponent ethanol/water droplets by cavity-enhanced Raman scattering

Cited by 38 publications

References 26 publications

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

Measurement and Evaluation of Elastic Light Scattering from a Single Levitated Irregular Particle

Optical Microresonators for Sensing and Transduction: A Materials Perspective

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