The Discrete Dipole Approximation: A Review

Chaumet, Patrick C.

doi:10.3390/math10173049

Cited by 24 publications

(9 citation statements)

References 99 publications

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“…The first multiport model for RIS-aided channels was introduced in [33], assuming a minimum scattering radiating element configuration. The model employed thin wire dipoles as scattering elements for analytical tractability, aligning with the discrete dipole approximation [34]. A similar model based on the coupled dipoles formalism is presented in [35].…”

Section: Introductionmentioning

confidence: 99%

MIMO Interference Channels Assisted by Reconfigurable Intelligent Surfaces: Mutual Coupling Aware Sum-Rate Optimization Based on a Mutual Impedance Channel Model

Abrardo

Dardari

Renzo

et al. 2021

IEEE Wireless Commun. Lett.

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Reconfigurable Intelligent Surfaces (RIS) will play a pivotal role in next-generation wireless systems. Despite efforts to minimize pilot overhead associated with channel estimation, the necessity of configuring the RIS multiple times before obtaining reliable Channel State Information (CSI) may significantly diminish their benefits. Therefore, we propose a CSI-free approach that explores the feasibility of optimizing the RIS for the uplink of a communication system in the presence of interfering users without relying on CSI estimation but leveraging solely some a priori statistical knowledge of the channel. In this context, we consider a multiport network model that accounts for several aspects overlooked by traditional RIS models used in Communication Theory, such as mutual coupling among scattering elements and the presence of structural scattering. The proposed approach targets the maximization of the average achievable rate and is shown to achieve performance that, in some cases, can be very close to the case where the RIS is optimized leveraging perfect CSI.

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Section: Introductionmentioning

confidence: 99%

MIMO Interference Channels Assisted by Reconfigurable Intelligent Surfaces: Mutual Coupling Aware Sum-Rate Optimization Based on a Mutual Impedance Channel Model

Abrardo

Dardari

Renzo

et al. 2021

IEEE Wireless Commun. Lett.

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“…Considering the large differences observed between the experimental results and the mechanistic simulations, we computed rigorously the electromagnetic scattering of the three-dimensional object, that is, the PS Ru@bead (refractive index: 1.589) placed in a PBS solution (refractive index: 1.335), by using the DDA. 73 Herein, we selected PS beads instead of magnetic beads because their refractive index at 620 nm is well-known. The refractive index for magnetic beads is approximately 1.6.…”

Section: ■ Resultsmentioning

confidence: 99%

Optics Determines the Electrochemiluminescence Signal of Bead-Based Immunoassays

Han,

Jiang,

Valenti

et al. 2023

ACS Sens.

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Electrochemiluminescence (ECL) is an optical readout technique that is successfully applied for the detection of biomarkers in body fluids using microbead-based immunoassays. This technology is of utmost importance for in vitro diagnostics and thus a very active research area but is mainly focused on the quest for new dyes and coreactants, whereas the investigation of the ECL optics is extremely scarce. Herein, we report the 3D imaging of the ECL signals recorded at single microbeads decorated with the ECL labels in the sandwich immunoassay format. We show that the optical effects due to the light propagation through the bead determine mainly the spatial distribution of the recorded ECL signals. Indeed, the optical simulations based on the discrete dipole approximation compute rigorously the electromagnetic scattering of the ECL emission by the microbead and allow for reconstructing the spatial map of ECL emission. Thus, it provides a global description of the ECL chemical reactivity and the associated optics. The outcomes of this 3D imaging approach complemented by the optical modeling provide insight into the ECL optics and the unique ECL chemical mechanism operating on bead-based immunoassays. Therefore, it opens new directions for mechanistic investigations, ultrasensitive ECL bioassays, and imaging.

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“…The sphere of the PMMA particle was discretized into cubic cells. The response electric field E i and the induced polarization P i on each i -th cell are described as follows, – E i = E inc false( bold-italicr i false) + k w 2 ε 0 ε m e d ∑ j G false( bold-italicr i , bold-italicr j false) P j V j P i = ε 0 χ false( bold-italicr i false) E i where r i and V i are the position and volume of i -th cell, respectively. k w is the wavenumber, ε 0 is the permittivity of vacuum, G is the free-space Green’s function, and χ( r ) = ε( r )−ε med is the electric susceptibility (ε( r ) is the relative dielectric constant).…”

Section: Methodsmentioning

confidence: 99%

Nanoscopic Photomechanical Motion of Small Particles Induced by Optical Force due to Positive and Negative Photoabsorption by Excited States of Molecules

Ito,

Mizoguchi,

Mori

et al. 2024

J. Phys. Chem. C

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In the present study, we have successfully induced microscopic mechanical motions of single small particles by using optical force due to the transient absorption (TA) of organic dyes in the excited state. Single polymer microparticles containing a perylenediimide derivative (BPPDI) were optically trapped in water with a focused near-infrared (NIR) pulsed laser light. The trapped microparticle was photoexcited with visible (VIS) laser pulses to pump the dye to the excited state. Since the dye in the excited state has strong absorption band in NIR wavelength region, the trapped particle additionally experienced optical force due to the TA. The particle was thus pushed, and the trapping point moved toward the propagation direction along the optical axis of the NIR laser. Furthermore, we demonstrated optical pulling force by using "negative" TA, which is due to stimulated emission. A single polymer microparticle with Styryl 9M (S9M), showing stimulated emission in the NIR region, was optically trapped and photoexcited in a similar manner with microparticles containing BPPDI. The trapping point moved in the opposite direction of the incident NIR pulses because of the stimulated emission. These optical trapping behaviors were analyzed, and the positive (pushing) and negative (pulling) TA forces were evaluated on the basis of detailed theoretical calculation.

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The Discrete Dipole Approximation: A Review

Cited by 24 publications

References 99 publications

MIMO Interference Channels Assisted by Reconfigurable Intelligent Surfaces: Mutual Coupling Aware Sum-Rate Optimization Based on a Mutual Impedance Channel Model

MIMO Interference Channels Assisted by Reconfigurable Intelligent Surfaces: Mutual Coupling Aware Sum-Rate Optimization Based on a Mutual Impedance Channel Model

Optics Determines the Electrochemiluminescence Signal of Bead-Based Immunoassays

Nanoscopic Photomechanical Motion of Small Particles Induced by Optical Force due to Positive and Negative Photoabsorption by Excited States of Molecules

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