Athanasios G. Polimeridis
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View article: Novel Numerical Basis Sets for Electromagnetic Field Expansion in Arbitrary Inhomogeneous Objects
Novel Numerical Basis Sets for Electromagnetic Field Expansion in Arbitrary Inhomogeneous Objects Open
We investigated how to construct low-order subspace basis sets to accurately represent electromagnetic fields generated within inhomogeneous arbitrary objects by radio-frequency sources external to a Huygen's surface. The basis generation …
View article: Maxwell parallel imaging
Maxwell parallel imaging Open
Purpose To develop a general framework for parallel imaging (PI) with the use of Maxwell regularization for the estimation of the sensitivity maps (SMs) and constrained optimization for the parameter‐free image reconstruction. Theory and M…
View article: A formalism to investigate the optimal transmit efficiency in radiofrequency shimming
A formalism to investigate the optimal transmit efficiency in radiofrequency shimming Open
Transmit efficiency specifies the amplitude of the magnetic resonance excitation field produced over a region of interest with respect to the radiofrequency (RF) power deposited in the sample. This metric is highly important at ultra‐high …
View article: Magnetic-Resonance-Based Electrical Property Mapping Using Global Maxwell Tomography With an 8-Channel Head Coil at 7 Tesla: A Simulation Study
Magnetic-Resonance-Based Electrical Property Mapping Using Global Maxwell Tomography With an 8-Channel Head Coil at 7 Tesla: A Simulation Study Open
Objective: Global Maxwell Tomography (GMT) is a recently introduced volumetric technique for noninvasive estimation of electrical properties (EP) from magnetic resonance measurements. Previous work evaluated GMT using ideal radiofrequency …
View article: Magnetic-resonance-based electrical property mapping using Global Maxwell Tomography with an 8-channel head coil at 7 Tesla: a simulation study
Magnetic-resonance-based electrical property mapping using Global Maxwell Tomography with an 8-channel head coil at 7 Tesla: a simulation study Open
Objective: Global Maxwell Tomography (GMT) is a recently introduced volumetric technique for noninvasive estimation of electrical properties (EP) from magnetic resonance measurements. Previous work evaluated GMT using ideal radiofrequency …
View article: Magnetic-resonance-based electrical property mapping using Global\n Maxwell Tomography with an 8-channel head coil at 7 Tesla: a simulation study
Magnetic-resonance-based electrical property mapping using Global\n Maxwell Tomography with an 8-channel head coil at 7 Tesla: a simulation study Open
Objective: Global Maxwell Tomography (GMT) is a recently introduced\nvolumetric technique for noninvasive estimation of electrical properties (EP)\nfrom magnetic resonance measurements. Previous work evaluated GMT using ideal\nradiofrequen…
View article: Reduced Order Models for Fast Antenna Characterization
Reduced Order Models for Fast Antenna Characterization Open
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View article: Circulant preconditioning in the volume integral equation method for silicon photonics
Circulant preconditioning in the volume integral equation method for silicon photonics Open
Recently, the volume integral equation (VIE) approach has been proposed as an efficient simulation tool for silicon photonics applications [J. Lightw. Technol.36, 3765 (2018)JLTEDG0733-872410.1109/JLT.2018.2842054]. However, for the high-f…
View article: Noninvasive Estimation of Electrical Properties From Magnetic Resonance Measurements via Global Maxwell Tomography and Match Regularization
Noninvasive Estimation of Electrical Properties From Magnetic Resonance Measurements via Global Maxwell Tomography and Match Regularization Open
GMT could provide insight into the distribution of electromagnetic fields inside the body, which represents one of the key ongoing challenges for various diagnostic and therapeutic applications.
View article: Preconditioning the discrete dipole approximation
Preconditioning the discrete dipole approximation Open
The discrete dipole approximation (DDA) is a popular numerical method for calculating the scattering properties of atmospheric ice crystals. The standard DDA formulation involves the uniform discretization of the underlying volume integral…
View article: A Fast Volume Integral Equation Solver with Linear Basis Functions for\n the Accurate Computation of Electromagnetic Fields in MRI
A Fast Volume Integral Equation Solver with Linear Basis Functions for\n the Accurate Computation of Electromagnetic Fields in MRI Open
A stable volume integral equation (VIE) solver based on\npolarization/magnetization currents is presented, for the accurate and\nefficient computation of the electromagnetic scattering from highly\ninhomogeneous and high contrast objects.W…
View article: A Fast Volume Integral Equation Solver with Linear Basis Functions for the Accurate Computation of Electromagnetic Fields in MRI
A Fast Volume Integral Equation Solver with Linear Basis Functions for the Accurate Computation of Electromagnetic Fields in MRI Open
A stable volume integral equation (VIE) solver based on polarization/magnetization currents is presented, for the accurate and efficient computation of the electromagnetic scattering from highly inhomogeneous and high contrast objects.We e…
View article: Adiabatic Absorbers in Photonics Simulations with the Volume Integral Equation Method
Adiabatic Absorbers in Photonics Simulations with the Volume Integral Equation Method Open
This paper describes the implementation and performance of adiabatic absorbing layers in an FFT-accelerated volume integral equation (VIE) method for simulating truncated nanophotonics structures. At the truncation sites, we place absorbin…
View article: Photon Torpedoes and Rytov Pinwheels: Integral-Equation Modeling of Non-Equilibrium Fluctuation-Induced Forces and Torques on Nanoparticles
Photon Torpedoes and Rytov Pinwheels: Integral-Equation Modeling of Non-Equilibrium Fluctuation-Induced Forces and Torques on Nanoparticles Open
We present new theoretical tools, based on fluctuational electrodynamics and the integral-equation approach to computational electromagnetism, for numerical modeling of forces and torques on bodies of complex shapes and materials due to em…
View article: Computation of ultimate SAR amplification factors for radiofrequency hyperthermia in non-uniform body models: impact of frequency and tumour location
Computation of ultimate SAR amplification factors for radiofrequency hyperthermia in non-uniform body models: impact of frequency and tumour location Open
The uSAFs computed in this work are very large (40-100 for shallow tumours and 4-17 for deep tumours), indicating that there is a large room for improvement of the current state-of-the-art head and neck HT devices.
View article: Computation of ultimate SAR amplification factors for radiofrequency hyperthermia in non-uniform body models: impact of frequency and tumour location
Computation of ultimate SAR amplification factors for radiofrequency hyperthermia in non-uniform body models: impact of frequency and tumour location Open
Purpose: We introduce a method for calculation of the ultimate specific absorption rate (SAR) amplification factors (uSAF) in non-uniform body models. The uSAF is the greatest possible SAF achievable by any hyperthermia (HT) phased array f…
View article: The ultimate signal‐to‐noise ratio in realistic body models
The ultimate signal‐to‐noise ratio in realistic body models Open
Purpose We compute the ultimate signal‐to‐noise ratio (uSNR) and G‐factor (uGF) in a realistic head model from 0.5 to 21 Tesla. Methods We excite the head model and a uniform sphere with a large number of electric and magnetic dipoles plac…
View article: Amplified and directional spontaneous emission from arbitrary composite bodies: A self-consistent treatment of Purcell effect below threshold
Amplified and directional spontaneous emission from arbitrary composite bodies: A self-consistent treatment of Purcell effect below threshold Open
We study amplified spontaneous emission (ASE) from wavelength-scale composite bodies--complicated arrangements of active and passive media--demonstrating highly directional and tunable radiation patterns, depending strongly on pump conditi…
View article: Temperature control of thermal radiation from composite bodies
Temperature control of thermal radiation from composite bodies Open
We demonstrate that recent advances in nanoscale thermal transport and\ntemperature manipulation can be brought to bear on the problem of tailoring\nthermal radiation from compact emitters. We show that wavelength-scale\ncomposite bodies i…
View article: Fundamental limits to optical response in absorptive systems
Fundamental limits to optical response in absorptive systems Open
At visible and infrared frequencies, metals show tantalizing promise for strong subwavelength resonances, but material loss typically dampens the response. We derive fundamental limits to the optical response of absorptive systems, boundin…
View article: Fluctuating volume-current formulation of electromagnetic fluctuations in inhomogeneous media: Incandescence and luminescence in arbitrary geometries
Fluctuating volume-current formulation of electromagnetic fluctuations in inhomogeneous media: Incandescence and luminescence in arbitrary geometries Open
We describe a fluctuating volume--current formulation of electromagnetic fluctuations that extends our recent work on heat exchange and Casimir interactions between arbitrarily shaped homogeneous bodies [Phys. Rev. B. 88, 054305] to situat…
View article: Fluctuating volume-current formulation of electromagnetic fluctuations in inhomogeneous media: Incandescence and luminescence in arbitrary geometries
Fluctuating volume-current formulation of electromagnetic fluctuations in inhomogeneous media: Incandescence and luminescence in arbitrary geometries Open
We describe a fluctuating volume-current formulation of electromagnetic fluctuations that extends our recent work on heat exchange and Casimir interactions between arbitrarily shaped homogeneous bodies [A. W. Rodriguez, M. T. H. Reid, and …
View article: Fundamental limits to the optical response of lossy media
Fundamental limits to the optical response of lossy media Open
At visible and infrared frequencies, metals show tantalizing promise for strong subwavelength resonances, but material loss typically dampens the response. We derive fundamental limits to the optical response of lossy media, bounding the l…