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Light scattering

About: Light scattering is a research topic. Over the lifetime, 37721 publications have been published within this topic receiving 861581 citations.


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Journal ArticleDOI
TL;DR: In this article, a detailed experimental study of coherent backscattering of light from aqueous suspensions of polystyrene microspheres is presented, focusing on the effects of particle size, of absorption due to added dye and of light polarization on the shape and height of the backscatter cone.
Abstract: A detailed experimental study of coherent backscattering of light from aqueous suspensions of polystyrene microspheres is presented. Emphasis is on the effects of particle size, of absorption due to added dye and of light polarization on the shape and height of the backscattering cone. For parallel polarization of incident and scattered beams, the scalar diffusion theory, parametrized by the transport mean free path l*, agrees well with our data up to surprizingly large scattering angles (ql * ~ 1) and quantitatively accounts for the rounding of the cones due to absorption. No deviations from the usual Gaussian statistics of scattered fields is observed up to λ/l* ∼ 0.1.

195 citations

Journal ArticleDOI
TL;DR: The anti-Stokes background is highly temperature dependent and is shown to be related to the thermal occupation of electronic states within the metal via a simple model, which suggests new routes to enhance SERS sensitivities, as well as providing ubiquitous and calibrated real-time temperature measurements of nanostructures.
Abstract: Temperature-dependent surface-enhanced Raman scattering (SERS) is used to investigate the photoluminescence and background continuum always present in SERS but whose origin remains controversial. Both the Stokes and anti-Stokes background is found to be dominated by inelastic light scattering (ILS) from the electrons in the noble metal nanostructures supporting the plasmon modes. The anti-Stokes background is highly temperature dependent and is shown to be related to the thermal occupation of electronic states within the metal via a simple model. This suggests new routes to enhance SERS sensitivities, as well as providing ubiquitous and calibrated real-time temperature measurements of nanostructures.

195 citations

Proceedings ArticleDOI
12 Feb 1993
TL;DR: In this article, the authors applied Cloude's decomposition to imaging radar polarimetry and found that the vegetation is probably thin compared to even the C-band radar wavelength of 6 cm.
Abstract: In this paper we applied Cloude's decomposition to imaging radar polarimetry. We show in detail how the decomposition results can guide the interpretation of scattering from vegetated areas. For multifrequency polarimetric radar measurements of a clear-cut area, the decomposition leads us to conclude that the vegetation is probably thin compared to even the C-band radar wavelength of 6 cm. For a frosted area, we notice an increased amount of even number of reflection scattering at P-band and L-band, probably the result of penetration through the coniferous canopy resulting in trunk-ground double reflection scattering. However, the scattering for the forested area is still dominated by scattering from randomly oriented cylinders. It is found that these cylinders are thicker than in the case of clear-cut areas, leading us to conclude that scattering from the branches probably dominates in this case.

195 citations

Journal ArticleDOI
TL;DR: In this article, the concentration-specific absorption coefficient of mineral particles am∗ is generally found to decrease exponentially with wavelength towards (in their data) a constant non-zero value in the red.
Abstract: Small mineral particles suspended in the sea are excellent at reflecting light and show up well in visible band satellite images. In order to make quantitative estimates of the particle concentration, and its effect on the penetration of sunlight into the sea, it is necessary to know how the absorption, scattering and backscattering coefficients of these inorganic particles change with concentration, the nature of the particles, and with wavelength. In this paper, observations from the literature are supplemented with a data set from the Irish Sea. The concentration-specific absorption coefficient of mineral particles am∗ is generally found to decrease exponentially with wavelength towards (in our data) a constant non-zero value in the red. Specific scattering coefficients show a tendency to decrease from the open ocean into energetic shelf seas and estuaries, but then to increase again within shelf seas as turbulent energy increases. The variation of specific scattering with turbulent energy in the Irish Sea is consistent with particle size scaling with the Kolmogorov microscale. Colour ratios (the ratio of two reflection coefficients) are less sensitive to variations in scattering, and we suggest that a combination of satellite measurements of brightness and colour in water with high mineral suspended sediment content will produce (1) a better estimate of concentration and (2) information on the variation of specific scattering.

195 citations

Journal ArticleDOI
TL;DR: In this paper, a multichannel spectroscopic ellipsometer based on the rotating-compensator principle was developed and applied to measure the time evolution of spectra (1.5 − 4.0 eV) in the normalized Stokes vector of the light beam reflected from the surface of a growing film.
Abstract: A multichannel spectroscopic ellipsometer based on the rotating-compensator principle was developed and applied to measure the time evolution of spectra (1.5–4.0 eV) in the normalized Stokes vector of the light beam reflected from the surface of a growing film. With this instrument, a time resolution of 32 ms for full spectra is possible. Several advantages of the rotating-compensator multichannel ellipsometer design over the simpler rotating-polarizer design are demonstrated here. These include the ability to: (i) determine the sign of the p-s wave phase-shift difference Δ, (ii) obtain accurate Δ values for low ellipticity polarization states, and (iii) deduce spectra in the degree of polarization of the light beam reflected from the sample. We have demonstrated the use of the latter spectra to characterize instrument errors such as stray light inside the spectrograph attached to the multichannel detector. The degree of polarization of the reflected beam has also been applied to characterize the time evo...

195 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023235
2022537
2021485
2020680
2019751
2018799