Derivation of the optical autocorrelation function from Raman scattering of diffusing particles

Nishida, Maki; Keuren, Edward Van

doi:10.1080/09500340.2011.631053

Cited by 1 publication

(3 citation statements)

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“…(1) [26]. In contrast, in the experimental set-up proposed in [18], the ACFs are of the form of Eq. (2).…”

Section: Autocorrelation Functionsmentioning

confidence: 99%

“…Nevertheless, in spite of these demonstrations of feasibility done more than ten years ago, RCS was not developed and stagnated in the proof-of-principle state restricted to these cases where amplifications of the Raman signal could be obtained. Recently, however, a group proposed an alternative experimental implementation for RCS measurements [18] aiming at exploiting the coherence of the Raman process. In their case, the experimental set-up is different than the ones used in the previous studies and in FCS.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the apparatus and the underlying principle of their method are based on those of standard DLS measurements, which means that the temporal fluctuations of the Raman intensities are due to the phase shifts of the scattered fields as the scatterers move. The authors derived the optical autocorrelation function of Raman intensities in this configuration [18] and carried out some experiments [19] also on beta-carotene particles illuminated in the visible spectral range.…”

Section: Introductionmentioning

confidence: 99%

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Non-resonant and non-enhanced Raman Correlation Spectroscopy

Barbara¹,

Dubois²,

Quemerais³

et al. 2013

Opt. Express

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We present the first non-resonant and non-enhanced Raman correlation spectroscopy experiments. They are conducted on a confocal microscope combined with a Raman spectrometer. The thermal fluctuations of the Raman intensities scattered by dispersions of polystyrene particles of sub-micrometric diameters are measured and analysed by deriving the autocorrelation functions (ACFs) of the intensities. We show that for particles of diameter down to 200 nm, RCS measurements are successfully obtained in spite of the absence of any source of amplification of the Raman signal. For particles of diameter ranging from 200 to 750 nm, the ACFs present a time-decay behaviour in accordance with the model of free Brownian particles. For particles of 1000 nm in diameter, the AFCs present a different behaviour with a much smaller characteristic time. This results from the dynamics of a single-Brownian particle trapped in the confocal volume by the optical forces of the focus spot.

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“…(1) [26]. In contrast, in the experimental set-up proposed in [18], the ACFs are of the form of Eq. (2).…”

Section: Autocorrelation Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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