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Bibliografías temáticas / OPTICALLY THIN MEDIA

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Artículos de revistas

Literatura académica sobre el tema "OPTICALLY THIN MEDIA"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "OPTICALLY THIN MEDIA"

1

Chen, L. H., A. Garo, K. Cen, and G. Grehan. "Numerical simulation of soot optical diagnostics in non-optically thin media." Applied Physics B 87, no. 4 (2007): 739–47. http://dx.doi.org/10.1007/s00340-007-2646-2.

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2

McGarragh, Greg, and Philip Gabriel. "Efficient computation of radiances for optically thin media by Padé approximants." Journal of Quantitative Spectroscopy and Radiative Transfer 111, no. 12-13 (2010): 1885–99. http://dx.doi.org/10.1016/j.jqsrt.2010.03.011.

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3

Boardman, A., and P. Egan. "S-polarized waves in a thin dielectric film asymmetrically bounded by optically nonlinear media." IEEE Journal of Quantum Electronics 21, no. 10 (1985): 1701–13. http://dx.doi.org/10.1109/jqe.1985.1072568.

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4

Azad, F. H. "Differential Approximation to Radiative Transfer in Semitransparent Media." Journal of Heat Transfer 107, no. 2 (1985): 478–81. http://dx.doi.org/10.1115/1.3247443.

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Radiative transfer in a semitransparent medium is treated using the differential approximation. Boundary conditions are formulated to accommodate direction-dependent reflection and refraction at a dielectric interfaces. The approximate results are compared to numerical solution of the exact integral equation. Also, a modification based on the exact formulation of the integrated intensity at the interface is presented that significantly improves the accuracy of the differential approximation in the optically thin regimes.

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5

Brown, D. C. "Rigrod laser-pumped-laser resonator model: II. Application to thin and optically-dilute laser media." Laser Physics 24, no. 8 (2014): 085003. http://dx.doi.org/10.1088/1054-660x/24/8/085003.

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6

Matousek, P., N. Everall, M. Towrie, and A. W. Parker. "Depth Profiling in Diffusely Scattering Media Using Raman Spectroscopy and Picosecond Kerr Gating." Applied Spectroscopy 59, no. 2 (2005): 200–205. http://dx.doi.org/10.1366/0003702053085115.

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We demonstrate how pulsed laser Raman excitation (∼1 ps) followed by fast optical Kerr gating (∼4 ps) can be used to effectively separate Raman signals originating from different depths in heterogeneous diffusely scattering media. The diffuse scattering slows down photon propagation through turbid samples enabling higher depth resolution than would be obtained for a given instrumental time resolution in an optically transparent medium. Two types of experiments on two-layer systems demonstrate the ability to differentiate between surface and sub-surface Raman signals. A Raman spectrum was obtained of stilbene powder buried beneath a 1 mm over-layer of PMMA (poly(methyl methacrylate)) powder. The signal contrasts of the lower stilbene layer and upper PMMA layer were improved by factors ≥5 and ≥180, respectively, by rejecting the Raman component of the counterpart layer. The ability to select the Raman signal of a thin top surface layer in preference to those from an underlying diffusely scattering substrate was demonstrated using a 100 μm thick optically transparent film of PET (poly(ethylene terephthalate)) on top of stilbene powder. The gating resulted in the suppression of the underlying stilbene Raman signal by a factor of 1200. The experiments were performed in back-scattering geometry using 400 nm excitation wavelength. The experimental technique should be well suited to biomedical applications such as disease diagnosis.

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7

Yang, Bo, Jian-Fu Zhang, Alex Lazarian, and José Renan de Medeiros. "Statistical tracing of turbulent magnetic fields in the optically thick interstellar medium." Monthly Notices of the Royal Astronomical Society 503, no. 1 (2021): 768–76. http://dx.doi.org/10.1093/mnras/stab236.

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ABSTRACT Based on high-resolution 3D data cubes from a magnetohydrodynamic (MHD) turbulence simulation, we study how to reveal the direction of the magnetic field within the optically thick interstellar medium by using the velocity gradient technique (VGT), correlation function anisotropy (CFA), and principal component analysis of anisotropies (PCAA). Considering the CO molecular tracers as a tracing method for radiative transfer processes, we find that the VGT and CFA can successfully trace the orientation of mean magnetic fields, which is in good agreement with the low-resolution numerical results obtained in the case of an optically thin medium. Similar to the simulation of an optically thin ISM, our simulations show that PCCA is still unusable in optically thick media. The synergetic application of the VGT and CFA to high-resolution spectroscopic observations is expected to yield valuable information on the interstellar magnetic field.

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8

Badjin, Dmitry A., and Semyon I. Glazyrin. "Physical and numerical instabilities of radiatively cooling shocks in turbulent magnetized media." Monthly Notices of the Royal Astronomical Society 507, no. 1 (2021): 1492–512. http://dx.doi.org/10.1093/mnras/stab2318.

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ABSTRACT We consider the influence of a fluctuating magnetic field on to the structure formation and instabilities of radiatively cooling blast waves. The study is based on an example of optically thin post-adiabatic supernova remnants (SNRs) in the homogeneous interstellar medium. By means of analytic estimations and full-scale multidimensional simulations, we investigate the roles of thermal, hydrodynamic (corrugation, pulsational, convective, Rayleigh–Taylor, linear and non-linear Vishniac) and numerical instabilities (‘carbuncle’ and grid-forced effects). It is found that of primary importance is the interplay of the thermal instability with quasi-regular and random components of the interstellar field. Bending fluctuations caused by the latter can be strongly amplified by non-linear Vishniac instability in the SNR regions where the regular component is almost normal to the shock. The instabilities driven by counter-directional pressure and density gradients are limited mostly to very narrow post-shock cooling layers, transient perturbations of the same short scales, and rather weakly magnetized environments. Some of these results can also be applied to radiative shocks separating optically thick media from thin or semitransparent ones. Several recommendations and requirements on numerical simulation techniques are formulated.

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9

Zheng, Cheng, Jong Kang Park, Murat Yildirim, et al. "De-scattering with Excitation Patterning enables rapid wide-field imaging through scattering media." Science Advances 7, no. 28 (2021): eaay5496. http://dx.doi.org/10.1126/sciadv.aay5496.

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Nonlinear optical microscopy has enabled in vivo deep tissue imaging on the millimeter scale. A key unmet challenge is its limited throughput especially compared to rapid wide-field modalities that are used ubiquitously in thin specimens. Wide-field imaging methods in tissue specimens have found successes in optically cleared tissues and at shallower depths, but the scattering of emission photons in thick turbid samples severely degrades image quality at the camera. To address this challenge, we introduce a novel technique called De-scattering with Excitation Patterning or “DEEP,” which uses patterned nonlinear excitation followed by computational imaging–assisted wide-field detection. Multiphoton temporal focusing allows high-resolution excitation patterns to be projected deep inside specimen at multiple scattering lengths due to the use of long wavelength light. Computational reconstruction allows high-resolution structural features to be reconstructed from tens to hundreds of DEEP images instead of millions of point-scanning measurements.

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10

Kabashnikov, V. P., V. M. Popov, and A. I. Bril'. "Use of the Approximation of Optically Thin Pulsations in the Problems of Radiative Heat Transfer in Turbulent Media." Heat Transfer Research 34, no. 1-2 (2003): 10. http://dx.doi.org/10.1615/heattransres.v34.i1-2.130.

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