Determination of the bulk scattering parameters of diffusing materials

Leyre, Sven; Leloup, Frédéric; Audenaert, Jan; Durinck, Guy; Hofkens, Johan; Hanselaer, Peter

doi:10.1364/ao.52.004083

Cited by 22 publications

(24 citation statements)

References 21 publications

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“…The extrapolation is a linear extrapolation of the spectral radiant intensity divided by the cosine of the scatter angle. This extrapolation was chosen because it gives the exact value for the scattered radiant intensity in the case of a Lambertian scattered intensity pattern [9].…”

Section: Methodsmentioning

confidence: 99%

“…However, for the iterative procedure in the IAD method, a restricted number of parameters is necessary [9]. Usually, the HenyeyGreenstein phase function with one free parameter is employed in the IAD routine [8,9].…”

Section: Phase Functionsmentioning

confidence: 99%

“…Assumptions for the phase function of the material have to be made [9]. Commonly a predefined phase function with one free parameter is chosen, and the iterative procedure described above allows for the determination of the bulk scattering parameters.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the effective phase function of bulk diffusing materials with the inverse adding-doubling method

Leyre¹,

Meuret²,

Durinck³

et al. 2014

Appl. Opt.

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The accuracy of optical simulations including bulk diffusors is heavily dependent on the accuracy of the bulk scattering properties. If no knowledge on the physical scattering effects is available, an iterative procedure is usually used to obtain the scattering properties, such as the inverse Monte Carlo method or the inverse adding-doubling (AD) method. In these methods, a predefined phase function with one free parameter is usually used to limit the number of free parameters. In this work, three predefined phase functions (Henyey-Greenstein, two-term Henyey-Greenstein, and Gegenbauer kernel (GK) phase function) are implemented in the inverse AD method to determine the optical properties of two strongly diffusing materials: low-density polyethylene and TiO₂ particles. Using the presented approach, an estimation of the effective phase function was made. It was found that the use of the GK phase function resulted in the best agreement between calculated and experimental transmittance, reflectance, and scattered radiant intensity distribution for the LDPE sample. For the TiO₂ sample, a good agreement was obtained with both the two-term Henyey-Greenstein and the GK phase function.

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Section: Methodsmentioning

confidence: 99%

Section: Phase Functionsmentioning

confidence: 99%

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Estimation of the effective phase function of bulk diffusing materials with the inverse adding-doubling method

Leyre¹,

Meuret²,

Durinck³

et al. 2014

Appl. Opt.

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“…11,12 The refractive index of the silicone is determined by the phenyl-methyl concentration. Given that the phenyl-methyl concentration is the same for both the silicone oil and the silicone encapsulant, no significant change in the optical behavior is expected.…”

Section: Simulation Modelmentioning

confidence: 99%

“…The inverse problem solution to the RTE using the IAD has been performed using a MATLAB ® code developed and validated by Leyre et al 11 and updated by Córreia et al 16 Using genetic algorithms, the best-fit between experimental and calculated results is found considering 256 quadrature points in the discretization. The Gegenbauer-Kernel was adopted as the phase function 17 that best fits to the experimental data E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 2 ; 3 2 6 ; 4 8 0…”

Section: Simulation Modelmentioning

confidence: 99%

Spot phosphor concept applied to a remote phosphor light-emitting diode light engine

2016

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Abstract. Although remote phosphor technology outperforms conformal phosphor technology for midpower applications, one of the limiting factors due to its impact on the total cost is the amount of phosphor required. Furthermore, an important loss mechanism in remote phosphor light-emitting diode (LED) technology is the reabsorption of recycled, downconverted light by the phosphor. An obvious solution to this issue is to enable a light path for the converted light, such that further interactions with the phosphor element are avoided. We propose a spot phosphor concept to achieve this goal. To explore this configuration, a simulation model of a phosphor element is devised and validated. The optical input parameters are based on experimental data and the application of the inverse adding-doubling method. The resulting configuration, along with a long-pass filter, is shown to be a potential solution for reduction of phosphor usage. The moderate decrease in the light extraction ratio (LER) when applying the spot concept is partly attributed to the losses in the secondary optics needed to narrow the LED beam; the combination of the spot concept configuration with a directional light source such as a laser diode is shown to be a powerful combination for the enhancement of the LER. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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General Method for Determining Light Scattering and Absorption of Nanoparticle Composites

Wang

Nilsson

et al. 2018

Advanced Optical Materials

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Scattering and absorption from nanoparticles are of major importance in optical research as well as in a range of applications. The Kubelka–Munk two‐flux radiative transfer model gives a simple description of light scattering in nanoparticle composite materials, but inversion of experimental transmittance and reflectance data to obtain backscattering and absorption coefficients remains challenging. Here, a general method for evaluating these parameters from transmittance and reflectance spectra, combined with spectral angle resolved light scattering measurements is developed. The angular dependence is approximated by an extension of the empirical Reynolds–McCormick phase function, which is fitted to the experimental angle resolved light scattering data. This approach is verified by measurements on three typical nanoparticle/polymer composites containing plasmonic Au, ferromagnetic Fe3O4, and dielectric TiO2 particles. An approximation to the angular scattering pattern is further demonstrated, which can be applied to obtain the optical parameters using only reflectance and transmittance data, in cases where angle‐resolved measurements are not available. These results can be extended to a wide range of isotropic, anisotropic, and multiple scattering systems, and will be highly useful in the fields of light scattering coatings/metamaterials, UV‐shielding films, displays, absorption/scattering layers in solar cells and biological scatterers.

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Determination of the bulk scattering parameters of diffusing materials

Cited by 22 publications

References 21 publications

Estimation of the effective phase function of bulk diffusing materials with the inverse adding-doubling method

Estimation of the effective phase function of bulk diffusing materials with the inverse adding-doubling method

Spot phosphor concept applied to a remote phosphor light-emitting diode light engine

General Method for Determining Light Scattering and Absorption of Nanoparticle Composites

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