Fundamentals of Mie scattering

Nieto‐Vesperinas, M.

doi:10.1016/b978-0-08-102403-4.00007-4

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…Mie scattering theory enables the prediction and interpretation of scattering patterns, such as the intensity, phase, and angular distribution of the scattered radiation, by solving Maxwell's equations for electromagnetic waves interacting with spherical particles. This theory has applications in numerous disciplines including atmospheric physics, aerosol science, remote sensing, and nanoparticle research [34][35][36]. To analyze the scattering from micro-sized particles, we employed the Mie scattering cross-sections.…”

Section: Theorymentioning

confidence: 99%

Numerical analysis and experimental verification of optical scattering from microplastics

2023

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Accurate and fast characterization of the micron-sized plastic particles in aqueous media requires an in-depth understanding of light interaction with these particles. Due to the complexity of Mie scattering theory, the features of the scattered light have rarely been related to the physical properties of these tiny objects. To address this problem, we reveal the relation of the wavelength-dependent optical scattering patterns with the size and refractive index of the particles by numerically studying the angular scattering features. We subsequently present a low-cost setup to measure the optical scattering of the particles. Theoretical investigation shows that the angular distribution of the scattered light by microplastics carries distinct signatures of the particle size and the refractive index. The results can be used to develop a portable, low-cost setup to detect microplastics in water.

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Section: Theorymentioning

confidence: 99%

Numerical analysis and experimental verification of optical scattering from microplastics

2023

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“…Dielectric nanostructures made of high refractive index (HRI) materials can also produce the localization and intensification of electromagnetic fields with negligible Joule losses [ 8 ]. For certain photon energies, confined displacement currents can lead to resonances known as whispering gallery modes (WGM) [ 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Directional Scattering Switching from an All-Dielectric Phase Change Metasurface

et al. 2023

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All-dielectric metasurfaces are a blooming field with a wide range of new applications spanning from enhanced imaging to structural color, holography, planar sensors, and directionality scattering. These devices are nanopatterned structures of sub-wavelength dimensions whose optical behavior (absorption, reflection, and transmission) is determined by the dielectric composition, dimensions, and environment. However, the functionality of these metasurfaces is fixed at the fabrication step by the geometry and optical properties of the dielectric materials, limiting their potential as active reconfigurable devices. Herein, a reconfigurable all-dielectric metasurface based on two high refractive index (HRI) materials like silicon (Si) and the phase-change chalcogenide antimony triselenide (Sb2Se3) for the control of scattered light is proposed. It consists of a 2D array of Si–Sb2Se3–Si sandwich disks embedded in a SiO2 matrix. The tunability of the device is provided through the amorphous-to-crystalline transition of Sb2Se3. We demonstrate that in the Sb2Se3 amorphous state, all the light can be transmitted, as it is verified using the zero-backward condition, while in the crystalline phase most of the light is reflected due to a resonance whose origin is the contribution of the electric (ED) and magnetic (MD) dipoles and the anapole (AP) of the nanodisks. By this configuration, a contrast in transmission (ΔT) of 0.81 at a wavelength of 980 nm by governing the phase of Sb2Se3 can be achieved.

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Selective Hydroxylation of Carbon Fiber Paper for Long‐Lasting Hydrophilicity by a Green Chemistry Process

Wilsey

Watson

Fasusi

et al. 2022

Adv Materials Inter

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carbon materials can also possess high surface area, such as carbon fiber paper (CFP), making them desirable in many electrochemical, fuel cell, [1] electrolyzer, [2] supercapacitor, [3] sensing, [4] water desalination, [5] and wastewater treatment [6] applications. Another advantage is the excellent biocompatibility of CFP for in vitro and in vivo studies, [7] for biosensing applications, [8] tissue engineering, [9] and in regenerative medicine and cancer treatment. [10] We focus here on CFP because only macroscopic carbon materials can serve as scaffolds for these applications; carbon nanotubes and nanosized graphene flakes require additional supports. Globally scalable clean energy [11] and water purification [12] technologies as well as biocompatible systems must operate in aqueous media and, therefore, require carbon support materials that are hydrophilic for long periods of time.One obstacle that inhibits widespread use of macroscopic carbon materials in aqueous systems is their hydrophobicity. Hydrophilic carbon surfaces are needed to take advantage of the high internal surface area of CFP in aqueous media. Any hydrophilicity-imparting treatment must leave the carbon fiber network structurally intact, so that specifically designed carbon network architectures and pore sizes, which critically affect mass transport characteristics, are not altered during the process.Previously reported methods to increase hydrophilicity of CFP are plasma or chemical etching techniques, sometimes in combination with heat treatments. Ammonia, [6a] nitrogen, [13] oxygen [5,14] or air [15] plasma etching protocols have been reported. Such plasma etches work reasonably well on a laboratory scale, where electrode sizes are on the order of square centimeters or less; yet, plasma methods lead to significant embrittlement of CFP, precluding the production of structurally stable, large-area CFP sheets that are needed for industrial-scale electrolyzers and other applications. Ozone treatment also oxidizes carbon surfaces for improved hydrophilicity. [16] An additional disadvantage is that plasma and ozone generators require large capital expense, especially for large area substrates. Thermal oxidation by a treatment that took more than 16 h also increased hydrophilicity, [17] but that lasted only for 2 d in air when we followed the reported procedure; significant damage to the CFP mesostructures was also observed (Figure S1, Supporting This study reports the selective hydroxylation of macroscopic carbon surfaces that renders initially hydrophobic carbon fiber paper hydrophilic for more than one year (62 weeks) so far. This long time of sustained hydrophilicity is unprecedented and transforms the utility of macroscopic carbon materials. Quantification of surface oxygenates of a systematic series of 13 chemical treatments reveals that surface hydroxyls are predictors of long-lasting hydrophilicity. The rapid, mild, acid-free, transition-metal-free treatment does not leave surface residues, inhibits overoxidation of graphitic carb...

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Fundamentals of Mie scattering

Cited by 11 publications

References 49 publications

Numerical analysis and experimental verification of optical scattering from microplastics

Numerical analysis and experimental verification of optical scattering from microplastics

Directional Scattering Switching from an All-Dielectric Phase Change Metasurface

Selective Hydroxylation of Carbon Fiber Paper for Long‐Lasting Hydrophilicity by a Green Chemistry Process

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