Article
Acoustics
R. A. Martin
Summary: Acoustic scattering by small obstacles in the frequency domain has been extensively studied, but there is limited research on analogous results in the time domain. This paper outlines a preliminary theory for the interaction of a sound pulse with a small obstacle using time domain boundary integral equations. A key question addressed is the definition of a "small" obstacle.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Optics
Y. U. K. U. N. Zhu, Q. I. U. Y. A. N. Wang, L. I. R. E. N. Deng, G. U. O. Zhou, Y. U. Y. A. N. G. Liu, Y. U. Huang
Summary: By rational design and parameter engineering of the TiO2-Pt core-satellite construction, visible light absorption in small Pt nanoparticles can be enhanced by nearly 100 times. A crucial step is to bury the Pt NPs completely in the high refractive index TiO2 microsphere, and the proposed evaluation factor for light absorption enhancement in the Pt NPs is proved to be valid and useful. These findings provide new possibilities for transforming nonplasmonic catalytic transition metals into visible light photocatalysts.
Article
Nanoscience & Nanotechnology
Yu-Chien Huang, Te-Hsin Chen, Jz-Yuan Juo, Shi-Wei Chu, Chia-Lung Hsieh
Summary: A study demonstrated optical widefield interferometric photothermal microscopy for visualizing and quantifying heat generation of single nanoparticles with high sensitivity; the photothermal signal of small metallic nanoparticles was determined by the amount of dissipated heat, independent of particle size; for larger nanoparticles, the strong scattered light of the particle enhanced the photothermal signal by interfering with the scattered field of the thermal lens.
Article
Mathematics
Christodoulos E. Athanasiadis, Paraskevi Roupa
Summary: This paper investigates the scattering problem of line source electromagnetic waves in a multi-layered obstacle. The authors formulate this problem in two dimensions and prove several useful scattering relations, including a reciprocity principle and a general scattering theorem. These theorems can be utilized to approximate the far-field pattern in the low-frequency theory. Additionally, an optical theorem is derived as a corollary of the general scattering theorem. The authors also obtain a mixed reciprocity relation that can be employed in proving the uniqueness of inverse scattering problems.
Article
Optics
N. A. T. H. A. N. Grain, S. E. O. K. H. Y. O. U. N. G. Kim
Summary: Recent developments in chemical processes have discovered unique nanophotonic properties in the preparation of single-crystalline nanowire superlattices. Particularly, diameter-modulated silicon nanowire geometric superlattices have shown the capability of enhanced light manipulation through complex interference effects. This study re-imagines the origin of the complex interference effects and identifies refractive index modulation as a key deciding factor. The concept of a nanowire refractive index superlattice is introduced, and its application to other nanowire superlattice systems is suggested to potentially enhance lasing activities.
Article
Materials Science, Multidisciplinary
Alessandro Parisotto, Viola V. Vogler-Neuling, Ullrich Steiner, Matthias Saba, Bodo D. Wilts
Summary: Scientists have discovered that the beetle Euprotaetia inexpectata has a black appearance due to the presence of anisotropic micropillars that enhance absorptivity. This independent evolution of black surfaces in nature provides interesting templates for bio-inspired applications.
MATERIALS TODAY ADVANCES
(2023)
Article
Construction & Building Technology
Lili Liu, Yongsheng Ji, Furong Gao, Li Zhang, Zhongzhe Zhang, XiangYu Liu
Summary: The study investigated the effects of stirring rate, water-to-cement ratio, superplasticizer type and its addition order on the efficiency of CO2 absorption by fresh cement paste. It was found that increasing CO2 absorption amount resulted in loss of fluidity and hardening of the cement paste, while also improving the mechanical properties of the carbonated cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Physics, Multidisciplinary
L. Doyle, P. Khademi, P. Hilz, A. Saevert, G. Schaefer, J. Schreiber, M. Zepf
Summary: This article presents experimental investigations on the photon background in a vacuum chamber using a high power laser. The results indicate that surface scattering dominates as the main background contribution within certain parameter ranges.
NEW JOURNAL OF PHYSICS
(2022)
Article
Astronomy & Astrophysics
Alexey A. Kuznetsov, Gregory D. Fleishman
Summary: In the past decade, there has been a significant increase in the practical applications of microwave gyrosynchrotron emission for plasma diagnostics and astrophysical object modeling. The development of fast gyrosynchrotron codes has dramatically reduced computation time, but current limitations in the codes call for more flexible solutions to handle arbitrary input distributions for radiating electrons.
ASTROPHYSICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Faham Tahmasebinia, Adam Yang, Patrick Feghali, Krzysztof Skrzypkowski
Summary: Ground support systems, such as cable bolts, are used to manage and mitigate rock bursts in deep mines and excavations with high in-situ stresses. This study develops a numerical model to analyze the influence of key parameters on the displacement, shear force, and energy absorption capacity of cable bolts under dynamic loads. The results show that increasing bolt diameter and steel yield strength increases the shear force resisted and bolt displacement. Additionally, increasing the mass and velocity of the dynamic load increases the energy absorbed by the cable bolt.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Jian Dong, Wenjie Zhang, Linhua Liu
Summary: In this work, the discrete dipole approximation (DDA) method for electromagnetic (EM) scattering by arbitrary particles in an absorbing host medium is developed and validated. The study reveals that elongated particles are more likely to produce negative extinction effects, which is supported by the distribution of the near-field electric field. The DDA method presented in this study is proven to be useful and flexible for analyzing EM scattering by particles in an absorbing host medium.
Article
Optics
William E. Vargas, Diego M. Jimenez, Mavis L. Montero
Summary: This study uses the formalism of the Lorenz-Mie (LM) theory to estimate the contributions of radiation scattered into the detector acceptance angle to the measurements of direct transmittance and specular reflectance, enabling the decoupling of scattering and absorption mechanisms. Novel expressions are proposed to estimate the average path-length parameters of diffuse radiation, aiding in the accurate estimation of scattering and absorption coefficients.
Article
Thermodynamics
Xingyu Chen, Ping Zhou, Meijie Chen
Summary: This study systematically analyzed the effects of scattering characteristics of nanoparticle (NP) suspensions on their solar absorption performance. It found that enhancing the scattering ability of NP suspensions within a certain range can improve the absorptance. Additionally, by dispersing SiO2 NPs with strong scattering ability into the Cu@C NP suspension and optimizing the incident light location, the solar absorption efficiency of the mixed NP suspension was improved. The results indicate that tuning the scattering ability and incident light location can be a potential approach to enhance the solar absorption performance of NP suspensions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Optics
A. Tononi, J. Givois, D. S. Petrov
Summary: The study focused on N identical fermions interacting with a lighter atom via a zero-range attractive potential in one dimension. By using few-body and mean-field theories, the energies, critical mass ratios, and emergence of tetramer, pentamer, and hexamer were determined. The system becomes bound when the heavy-to-light mass ratio exceeds a critical value, which increases as N-3 at large N, and a more sophisticated Hartree-Fock approach was employed for a better description of the cluster's microscopic structure.
Article
Physics, Particles & Fields
John Ellis, Nick E. Mavromatos, Philipp Roloff, Tevong You
Summary: This study investigates the sensitivity of possible CLIC and FCC-ee measurements of light-by-light scattering to new and old physics, including various theoretical models. The results show that these measurements can provide insights into the new physics scales and the masses of new particles in certain scenarios. The study also explores the sensitivities within the Born-Infeld theory.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Chemistry, Multidisciplinary
Rifat Ahmmed Aoni, Shridhar Manjunath, Buddini Karawdeniya, Khosro Zangeneh Kamali, Lei Xu, Adam M. Damry, Colin J. Jackson, Antonio Tricoli, Andrey E. Miroshnichenko, Mohsen Rahmani, Dragomir N. Neshev
Summary: The development of nanoscale optical sensors is crucial for medical diagnostics and biosensing applications. Optical sensors based on resonant nanostructures and resonant dielectric metagratings offer high sensitivity and direct measurement of unknown analytes without the need for intensity calibrations. These sensors pave the way for novel miniaturized medical diagnostics and biosensing applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Lei Xu, Daria A. Smirnova, Rocio Camacho-Morales, Rifat Ahmmed Aoni, Khosro Zangeneh Kamali, Marcus Cai, Cuifeng Ying, Ze Zheng, Andrey E. Miroshnichenko, Dragomir N. Neshev, Mohsen Rahmani
Summary: Tailoring optically resonant features in dielectric metasurfaces provides a robust scheme to control electromagnetic near fields, boosting nanoscale nonlinear light-matter interactions. In this study, a silicon membrane metasurface consisting of dimer airy holes is designed as a versatile platform for generating four-wave mixing (FWM). The metasurface exhibits multi-resonant features, including a quasi bound state in the continuum (BIC), generated by the collective toroidal dipole mode excited in the designed periodic system.
NEW JOURNAL OF PHYSICS
(2022)
Review
Physics, Multidisciplinary
Lujun Huang, Alex Krasnok, Andrea Alu, Yiling Yu, Dragomir Neshev, Andrey E. Miroshnichenko
Summary: Two-dimensional transition metal dichalcogenide materials have extraordinary electronic, optical, and thermal properties, with monolayers exhibiting strong photoluminescence due to high quantum yields. Resonant nanophotonic structures enhance light-matter interactions and performance. Rapidly developing field with diverse potential applications.
REPORTS ON PROGRESS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ibrahim A. M. Al-Ani, Khalil As'Ham, Lujun Huang, Andrey E. Miroshnichenko, Wen Lei, Haroldo T. Hattori
Summary: By optimizing the strong coupling between perovskite excitons and quasi-bound states in the continuum, supported by an all-perovskite metagrating with high-quality factor, it is possible to achieve a record high Rabi splitting value. The thickness of the perovskite metasurface and the Q-factor of the QBIC mode play dominant roles in enhancing the strong coupling.
ADVANCED OPTICAL MATERIALS
(2022)
Review
Optics
Ibrahim A. M. Al-Ani, Khalil As'ham, Oleh Klochan, Haroldo T. Hattori, Lujun Huang, Andrey E. Miroshnichenko
Summary: The strong interaction between TMDC exciton and photonic nanocavities results in the formation of a unique hybrid light-matter quasiparticle known as exciton-polariton. This mixed state combines the advantages of rapid propagation and low effective mass from photonics with the desirable optical properties of TMDC exciton, such as nonlinearity and spin-valley polarization. As a result, it serves as an ideal platform for studying various physics phenomena and designing novel optoelectronic devices.
Review
Materials Science, Multidisciplinary
Reza Masoudian Saadabad, Lujun Huang, Andrey B. Evlyukhin, Andrey E. Miroshnichenko
Summary: This review provides an overview of recent progress in the study of optical anapole states, including their generation, mathematical description, excitation methods, and potential value in various applications.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Feilong Yu, Jin Chen, Lujun Huang, Zengyue Zhao, Jiuxu Wang, Rong Jin, Jian Chen, Jian Wang, Andrey E. Miroshnichenko, Tianxin Li, Guanhai Li, Xiaoshuang Chen, Wei Lu
Summary: In this study, a versatile photonic slide rule based on an all-silicon metasurface is demonstrated, which allows for the reconstruction of photons' frequency and polarization state. By combining geometric phase and interference holography, angle-resolved in-pair spots are achieved in a transverse manner. The spin-orbital coupling between the incident photons and vortex phases provides a way to simultaneously identify the photons' frequency and circular polarization state.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Michael Tribelsky, Boris Y. Rubinstein
Summary: This paper discusses and categorizes the singularities of the Poynting vector field in subwavelength patterns in resonant light scattering by nanoparticles. There are two generic types of singularities, one related to the vanishing of the magnetic (and/or electric) field at the singular points, and the other related to the formation of standing waves in proximity to the singular points. The paper reveals the connection of these singularities to the topology of the singular points, space dimension (3D vs. 2D), and energy conservation law.
Article
Optics
Mohammed Alaloul, Jacob B. Khurgin, Ibrahim Al-Ani, Khalil As'ham, Lujun Huang, Haroldo T. Hattori, Andrey E. Miroshnichenko
Summary: This research proposes a simple model to evaluate the performance of a Si3N4 waveguide-integrated all-optical MoSe2 modulator, and obtains important parameter values such as switching energy, extinction ratio, and insertion loss. The device operates with ultrafast recovery time and high extinction ratio, suitable for practical applications.
Article
Physics, Applied
Khalil As'ham, Ibrahim Al-Ani, Wen Lei, Haroldo T. Hattori, Lujun Huang, Andrey Miroshnichenko
Summary: This study demonstrates strong coupling between exciton and optical cavity in a perovskite metasurface, supporting multipolar Mie resonance. The enhanced Rabi splitting observed in anapole-exciton strong coupling can be attributed to the stronger field localization within the perovskite. Furthermore, it is found that the Rabi splitting depends on the oscillatory strength of the exciton mode and can be boosted to higher values.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Michael Tribelsky, Boris Y. Rubinstein
Summary: The study found that the symmetry of the problem, spatial dimension, and energy conservation law impact the properties of singularities in the Poynting vector field. Different types of singularities are associated with the disappearance of magnetic or electric fields at the singular points, depending on the orientation of the polarization plane. Additionally, dissipation affects certain types of singularities more strongly than others, with the nature of singular points differing between the real and imaginary parts of the complex vector field.
Article
Engineering, Electrical & Electronic
Mohammed Alaloul, A. M. Al-Ani, Khalil As'Ham, Jacob B. Khurgin, Haroldo T. Hattori, Andrey E. Miroshnichenko
Summary: On-chip integration of mid-wave infrared (MWIR) absorption spectroscopy gas sensors allows for mass production of compact and inexpensive devices, enabling applications in environmental monitoring, quality control, and Internet-of-Things networks. The proposed MWIR graphene photodetector integrated into silicon-on-sapphire (SOS) slot waveguides enhances electric field distribution and absorption capabilities, enabling sub-ppb detection of greenhouse gases. These findings pave the way for the development of portable, inexpensive, and highly sensitive sensors integrated into miniaturized electronic-photonic chipsets.
IEEE SENSORS JOURNAL
(2023)
Review
Optics
Dragomir N. Neshev, Andrey E. Miroshnichenko
Summary: Optical metasurfaces, which are subwavelength-patterned surfaces that strongly interact with light, have been a popular research topic for over a decade. They offer advantages such as miniaturization of optical elements, novel functionalities for processing hidden light modalities, and the ability to adjust their properties as needed. Numerous applications focused on smart vision have emerged, envisioning the integration of meta-optical devices in robotic systems. The field is now experiencing significant industry demand, which is shaping the challenges and research directions. This review provides an overview of the application focus and discusses current challenges and future research frontiers in the field.
Article
Optics
Wenbin Ma, Chaobiao Zhou, Deliang Chen, Shaojun You, Xinfeng Wang, Liyang Wang, Li Jin, Lujun Huang, Daiqiang Wang, Andrey E. Miroshnichenko
Summary: In this work, a tunable quasi-BICs (QBICs) is demonstrated numerically by integrating a silicon metasurface with ENZ ITO thin film. Active control on the resonant peak position and intensity of transmission spectrum is achieved by integrating ENZ ITO thin films with QBICs supported by silicon metasurfaces. High modulation depth up to 14.8 dB is achieved by all QBICs in modulating the optical response of such a hybrid structure. The influence of carrier density on the performance of optical modulation based on this structure is also investigated.
Article
Optics
Khosro Zangeneh Kamali, Lei Xu, Nikita Gagrani, Hark Hoe Tan, Chennupati Jagadish, Andrey Miroshnichenko, Dragomir Neshev, Mohsen Rahmani
Summary: Metasurfaces with dynamic tunability in their optical behaviour are highly desired for various applications. In this study, we demonstrate electrically tunable metasurfaces driven by thermo-optic effect and flash-heating in silicon. The device allows for video frame rate optical switching over multiple pixels and is compatible with modern electronic display technologies. It shows advantages such as large modulation depth, low optical loss, low input voltage requirement, and high switching speed.
LIGHT-SCIENCE & APPLICATIONS
(2023)
