Article
Physics, Fluids & Plasmas
Hans W. Volkmer, Dexuan Xie
Summary: In this paper, an analytical solution is derived for a linear nonlocal Poisson-Boltzmann equation (NPBE) test model with multiple charges. The classic Kirkwood ball model is shown to be a special case of the NPBE test model, and a comparison study is conducted to demonstrate the differences between the two models.
Article
Chemistry, Analytical
Francesco Ruffino
Summary: The localized surface plasmon resonance properties of Ag and Au nanostructures make them increasingly interesting for enhancing light trapping in solar cell devices. This study using Mie theory investigates the angle-dependent light scattering intensity for Ag and Au nanoparticles coated with AZO, ITO, or PEDOT:PSS shells, showing that the core-shell sizes significantly affect the light scattering properties of nanoparticles.
Article
Nanoscience & Nanotechnology
Se-Ho Kim, Kihyun Shin, Xuyang Zhou, Chanwon Jung, Hyun You Kim, Stella Pedrazzini, Michele Conroy, Graeme Henkelman, Baptiste Gault
Summary: Atom probe tomography is a useful technique for obtaining sub-nanoscale information from technologically-relevant materials. However, the analysis of functional ceramics, especially perovskites, remains challenging due to low yield and success rate. This study shows that a metallic coating can prevent charge penetration and suppress the volume change associated with the piezoelectric effect, allowing for successful analysis of BaTiO3 particles in a metallic matrix.
SCRIPTA MATERIALIA
(2023)
Article
Optics
Francisco J. Diaz-Fernandez, Javier Marti, Carlos Garcia-Meca
Summary: Invisibility cloaks are a significant development in the field of metamaterials. While most efforts have been focused on improving the effectiveness of cloaks, little attention has been paid to the development of efficient techniques for detecting invisibility devices. This study proposes a different approach using diffraction tomography to enhance efficiency in detecting and obtaining images of invisibility cloaks, leading to improved sensitivity and potential application in sound cloaks.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Condensed Matter
D. E. Saldanha-Bautista, E. Padron-Hernandez
Summary: The solutions for magnetostatic spin waves modes in a spherical structure were studied. The displacement currents in the dielectric core were found to cause changes in the dispersion relation curves of the solutions.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Optics
Mushegh Rafayelyan, Henrik Melkonyan, Arman Tigranyan, Etienne Brasselet
Summary: We present a free-space strategy for electromagnetic concealment of three-dimensional macroscopic objects in the optical domain using optical phase singularities. By generating a quasi-nodal volume through optical vortex Fourier processing, light scattering from objects inside can be inhibited. Numerical simulations and experimental implementation using geometric phase vortex phase masks in the visible domain demonstrate the feasibility of optical cloaking. The geometric phase nature of the vortex masks enables polarization independent features and reflection mode implementation.
Article
Chemistry, Physical
Anna Pajor-Swierzy, Krzysztof Szczepanowicz, Alexander Kamyshny, Shlomo Magdassi
Summary: The review focuses on bimetallic nanoparticles consisting of a low-cost, high electrical conductivity metal core (such as Cu and Ni) and a protective shell made of a stable, oxidation-resistant noble metal (such as Ag or Au). The synthesis methods, including chemical and physical approaches, as well as their combination, are discussed. The review also covers the stability to oxidation of the core-shell nanoparticles under various conditions, and the formulation of conductive compositions and their application in conductive coatings and printed electronics.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Nicola Pellizzi, Alfredo Mazzulla, Pasquale Pagliusi, Gabriella Cipparrone
Summary: Core-shell architecture allows for customization of microparticles by selecting the composition and aggregation state of the inner and outer materials. Gold nanoparticles coating can modify the optical properties of chiral microparticles and improve the stability of microlasers.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Optics
Xiangyun Chen, Fan Yang, Renjia Guo, Changyuan Chen, Xiaohua Wang
Summary: This study proposes and studies a pressure-controlled cloak with a single shell of semiconductor (GaAs) that can greatly suppress the total scattering cross-section of the composite structure. The cloaking frequency can be tuned by modulating the permittivity of GaAs with external pressure, offering a potential way to achieve pressure-controlled invisibility.
Article
Chemistry, Multidisciplinary
Abhinav Parakh, Mehrdad Toussi Kiani, Emily Lindgren, Anabelle Colmenares, Andrew Curtis Lee, Yuri Suzuki, Xun Wendy Gu
Summary: Colloidal nanoparticles can form multifunctional nanoparticles with a conformal shell. A facile synthesis method for depositing metal boride amorphous coatings on metallic nanocrystals is introduced, which is independent of core size, shape, and composition. The coatings are highly resistant to crystallization and strongly bonded to the crystalline core.
Article
Chemistry, Multidisciplinary
Anna A. Nikitina, Valentin A. Milichko, Alexander S. Novikov, Artem O. Larin, Proloy Nandi, Utkur Mirsaidov, Daria Andreeva, Mikhail Rybin, Yuri S. Kivshar, Ekaterina Skorb
Summary: By modifying the surface of silicon nanoparticles with polyelectrolytes, stimuli-responsive nanostructures can be created, allowing for the tuning of shell thickness and scattering spectra. This opens up new opportunities for the application of smart nanomaterials in the fields of medicine and photonics.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Analytical
Francesco Ruffino
Summary: Bimetallic nanoparticles exhibit unique properties for various technological applications, particularly in terms of optical properties and their interaction with electromagnetic radiation. The core-shell structure significantly affects the optical properties of these nanoparticles.
Article
Astronomy & Astrophysics
Yury Shestopalov
Summary: A unified approach is developed for analyzing the singularities of the scattered field and the vanishing of scattering harmonics. Rigorous proofs are presented for the existence of complex resonance singularities in the solution to the problem of plane wave scattering by a circular homogeneous dielectric cylinder. The method involves a mathematically correct approach using spectral theory of open structures and generalized conditions at infinity, where complex resonance frequencies can be considered.
Article
Physics, Fluids & Plasmas
Gaetano Napoli, Luigi Vergori
Summary: The study investigates the temperature-induced isotropic-nematic phase transition on a spherical shell under the assumption of degenerate tangential anchoring within the framework of Landau-de Gennes theory. It finds the exact critical threshold value for the temperature and determines the nematic textures at the transition through weakly nonlinear analysis. The stability analysis shows that only the tetrahedral configuration is stable at the isotropic-nematic transition.
Article
Metallurgy & Metallurgical Engineering
A. A. Koval, A. Korotun
Summary: In this work, the interaction of electromagnetic waves with spherical metallic nanoparticles was studied using the model of an infinite spherical potential well. The formula for the dielectric tensor, taking into account the size dependence of the Fermi energy, was obtained and its diagonal components were calculated, showing strong size and frequency dependencies of the real and imaginary parts of the dielectric function. Calculations were performed for silver, copper, and aluminum particles.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Physics, Applied
Minye Yang, Zhilu Ye, Mohamed Farhat, Pai-Yen Chen
Summary: This article introduces cascaded parity-time (PT)-symmetric artificial sheets that exhibit multiple higher-order laser-absorber modes and bidirectional reflectionless transmission resonances in the PT-broken phase, as well as a unidirectional reflectionless transmission resonance associated with the exceptional point (EP). The gain-loss parameter required for obtaining these modes and their properties are derived. By exploiting the cascaded PT structures, the gain-loss threshold for self-dual laser-absorber operation can be significantly lowered. Interferometric sensing based on this multimodal laser-absorber shows exceptionally high sensitivity proportional to the number of metasurfaces along the light propagation direction.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Biomedical
Minye Yang, Zhilu Ye, Nabeel Alsaab, Mohamed Farhat, Pai-Yen Chen
Summary: This study addresses the challenge of signal reproducibility and robustness in passive wireless intracranial pressure monitoring by introducing a novel biotelemetry system. The system leverages the unique properties of non-Hermitian radio-frequency electronic systems with PT symmetry to achieve absolute accuracy. In-vitro experimental results show sub-mmHg resolution and ultra-robust wireless data acquisition. This research provides a practical pathway for reliable, real-time wireless monitoring of intracranial pressure and other vital signals from bio-implants and wearables.
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2022)
Correction
Multidisciplinary Sciences
Evgenia Rusak, Jakob Straubel, Piotr Gladysz, Mirko Goeddel, Andrzej Kedziorski, Michael Kuehn, Florian Weigend, Carsten Rockstuhl, Karolina Slowik
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Aso Rahimzadegan, Theodosios D. Karamanos, Rasoul Alaee, Aristeidis G. Lamprianidis, Dominik Beutel, Robert W. Boyd, Carsten Rockstuhl
Summary: Optical metasurfaces, composed of 2D scatterers, can control the properties of an incidence field. This article presents a theory that analytically links the properties of the scatterers to their optical response using the lattice coupling matrix. The proposed theoretical approach proves to be a powerful tool for designing and analyzing metasurfaces.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Applied
Mohamed Farhat, Sebastien Guenneau, Pai-Yen Chen, Ying Wu
Summary: This article investigates the acoustic scattering and radiation force and torque of cylindrical objects in spinning motion. By studying the radiation force and torque induced by different incident signals, it explores the manipulation of movement and position using time-varying and moving metamaterials in acoustic beams.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Benedikt Zerulla, Ramakrishna Venkitakrishnan, Dominik Beutel, Marjan Krstic, Christof Holzer, Carsten Rockstuhl, Ivan Fernandez-Corbaton
Summary: This article introduces a homogenization method based on the effective transition (T-) matrix, which allows for the computation of the response of arbitrarily shaped volumetric patchworks of structured molecular materials and metamaterials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Waqas W. Ahmed, Mohamed Farhat, Kestutis Staliunas, Xiangliang Zhang, Ying Wu
Summary: Non-Hermitian systems provide new platforms for manipulating physical properties through redistribution of refractive indices, leading to asymmetric reflection and symmetric transmission. Supervised and unsupervised learning techniques are applied to accelerate the inverse design process and recognize non-Hermitian features from transmission spectra. The developed deep learning framework determines the feasibility of desired spectral responses and uncovers the role of gain-loss parameters in tailoring the spectra.
COMMUNICATIONS PHYSICS
(2023)
Review
Chemistry, Analytical
Minye Yang, Zhilu Ye, Yichong Ren, Mohamed Farhat, Pai-Yen Chen
Summary: Wearable electronics, as a new and rapidly expanding interdisciplinary field, have shown significant potential in monitoring and analyzing body or environmental information through flexible substrates, conductors, and transducers. Recent progress in the development of emerging nanomaterial-based wearable electronics and their current state-of-the-art applications are reviewed in this article, along with an outlook on future research directions in this field.
Article
Multidisciplinary Sciences
Xuchen Wang, Mohammad Sajjad Mirmoosa, Viktar S. Asadchy, Carsten Rockstuhl, Shanhui Fan, Sergei A. Tretyakov
Summary: Photonic time crystals are artificial materials with spatially uniform but temporally varying electromagnetic properties. This study extends the concept of photonic time crystals to two-dimensional artificial structures called metasurfaces. By designing a microwave metasurface, the researchers confirmed the existence of momentum bandgaps and exponential wave amplification, demonstrating the potential of metasurfaces as a material platform for emerging photonic space-time crystals and for amplifying surface-wave signals in wireless communications.
Article
Optics
L. Kuhn, T. Repaen, C. Rockstuhl
Summary: The use of artificial neural networks in predicting electromagnetic fields has been limited by domain size and object shape restrictions. This study proposes the use of graph neural networks to solve Maxwell's equations, overcoming these limitations and providing size invariance and adaptability to any material shape or mesh structure.
Article
Optics
Dominik Beutel, Ivan Fernandez-Corbaton, Carsten Rockstuhl
Summary: The evaluation of lattice sums is necessary for analyzing the interaction between objects on a lattice. In electromagnetic scattering scenarios involving arrays of particles forming metamaterials, metasurfaces, or photonic crystals, Ewald's method can improve the convergence of lattice sums. This study presents a derivation of exponentially convergent series for the solutions of the Helmholtz equation, specifically for different dimensional cases and involving the interaction of sublattices. The derived formulas are applicable to various multipolar orders and have been validated through comparison with direct computation of lattice sums.
Article
Chemistry, Multidisciplinary
Benedikt Zerulla, Dominik Beutel, Christof Holzer, Ivan Fernandez-Corbaton, Carsten Rockstuhl, Marjan Krstic
Summary: This article introduces a novel multi-scale approach for simulating the nonlinear optical response of molecular materials. The approach combines ab initio quantum-chemical and classical Maxwell-scattering computations. By incorporating the first hyperpolarizability tensor computed with time-dependent density-functional theory into a multi-scattering formalism, the optical interaction between neighboring molecules is considered. The approach is versatile and accurate, making it suitable for exploring nonlinear photonic molecular materials in structured photonic environments in the future.
ADVANCED MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Yang Min-ye, Ye Zhi-lu, Zhu Liang, Farhat Mohamed, Chen Pai-Yen
Summary: In recent years, the peculiar physical phenomena enabled by non-Hermitian systems, particularly the parity-time (PT)-symmetric systems, have sparked significant research interest. While discussions on exceptional points (EPs) have been extensive, theoretical analysis and experimental validations of coherent perfect absorber-laser (CPAL) points are lacking. The CPAL phenomena, as a special solution in broken PT-symmetry phase, may have further counterintuitive physical features with implications for non-Hermitian physics.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Electrical & Electronic
Maryam Sakhdari, Zhilu Ye, Mohamed Farhat, Pai-Yen Chen
Summary: The emergence of exceptional points and divergent exceptional points in PT symmetric trimer opens up a new pathway for highly sensitive RF telemetric sensor systems. In this study, a rigorous analysis of PT symmetric electronic multimers is provided, shedding light on the lower bound of inductive coupling coefficient required to achieve divergent exceptional points. The results suggest a subtle compromise among the degree of bifurcation, critical inductive coupling strength, and spectral noises arising from modal interferences.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Multidisciplinary
Mateusz Pawlak, Maciej Baginski, Pablo Llombart, Dominik Beutel, Guillermo Gonzalez-Rubio, Ewa Gorecka, Carsten Rockstuhl, Jozef Mieczkowski, Damian Pociecha, Wiktor Lewandowski
Summary: This study discovered helical nanofilaments formed by liquid crystalline (LC) dimers depending on the parity of the alkyl linker, and investigated their formation mechanism through molecular dynamics simulations. The study also found that the assembly structure of gold nanoparticles doped into the LC matrix can be tuned by controlling the pitch of the helices. Furthermore, the impact of the assembly structure on the chiral optical properties of composites was investigated.
CHEMICAL COMMUNICATIONS
(2022)
