Article
Optics
Shu Zong, Dongwen Zeng, Guiqiang Liu, Yan Wang, Zhengqi Liu, Jing Chen
Summary: A hybrid chiral metasurface is proposed for differential absorption of circularly polarized light. The metasurface achieves nearly perfect absorption for right circularly polarized light and simultaneously reflects 90% of left circularly polarized light, generating strong circular dichroism. The dominant contributions to the chiral absorption and high circular dichroism response come from the electric dipole, magnetic dipole, and electric quadrupole.
Review
Chemistry, Multidisciplinary
Shuang Jiang, Nicholas A. Kotov
Summary: Chiral inorganic nanostructures have a strong interaction with photons, leading to a change in their polarization state and the emission of circularly polarized light. Understanding these polarization effects is important for various chemical and biological processes, as well as the development of chiral photonics. The interpretation of these effects is dependent on the structural parameters of the nanostructures, and there are different types of nanomaterials that exhibit either dominant circularly polarized luminescence or circularly polarized scattering.
ADVANCED MATERIALS
(2023)
Article
Optics
Chengzhi Zhang, Yuqiong Cheng, Shubo Wang
Summary: Researchers have achieved an arbitrary order exceptional surface in chiral particles mediated by photonic spin-orbit interaction, enabling unidirectional coupling between chirality dipole modes to convert free-space plane waves to guided waves.
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
Materials Science, Multidisciplinary
S. W. Lovesey
Summary: The ferrimagnet Mn3Si2Te6 has gained attention due to its recently discovered colossal magnetoresistance (CMR) with unique magnetic field properties. A neutron diffraction study has revealed an improved magnetic structure for the material, which is linked to understanding the CMR. Further theoretical investigation has uncovered previously unmentioned anapole, chiral, and orbital states of manganese ions. Additionally, it is suggested that the existence of these states in the low temperature form of Mn3Si2Te6 under a magnetic field can be tested using neutron and resonant x-ray diffraction.
Article
Optics
Hasan Zamani
Summary: Analytical examination of scattering from a chiral sphere above a lossy half-space is conducted in this study, which combines the vector Mie solution and field transformations between vector spherical functions and plane waves. The first-order Mie field and the relationship between Mie fields of successive orders are derived, leading to a series solution converted into a non-recursive formulation. The scattering field is written as the sum of the total Mie field and its reflection from the half-space, with numerically validated expressions and explanations provided based on the series solution.
Article
Physics, Multidisciplinary
Shahrokh Sepehrirahnama, Sebastian Oberst, Yan Kei Chiang, David A. Powell
Summary: Acoustic meta-atoms used as building blocks of metamaterials can control nonlinear acoustic effects of radiation force and torque, potentially enabling shape-dependent particle sorting.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Veronika Parfentyeva, Lorenzo Colombo, Pranav Lanka, Marco Pagliazzi, Annalisa Brodu, Niels Noordzij, Mirco Kolarczik, Alberto Dalla Mora, Rebecca Re, Davide Contini, Alessandro Torricelli, Turgut Durduran, Antonio Pifferi
Summary: Time-domain diffuse correlation spectroscopy (TD-DCS) is an advancement of continuous wave DCS (CW-DCS) that allows for depth-resolved blood flow index (BFI) measurement and extraction of optical properties without additional diffuse optics techniques. However, it has limited in vivo application due to being a photon-starved technique that focuses on late photons.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Hui Li, Yigeng Peng, Ruifeng Lu
Summary: This study investigated the effect of different substrates on the optical resonances of LiNbO3 nanoparticles and found that the electric and magnetic resonances of the system can be effectively adjusted by changing the substrate. Compared to the impact of dielectric substrate, the interaction between LiNbO3 nanoparticles and the Au film exhibited a sharp resonance peak. The size, shape of the nanoparticles, and the thickness of the SiO2 film between the particle and the Au film significantly influenced the electromagnetic resonance of LiNbO3 nanoparticles.
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
Optics
Ivan Lopushenko, Alexander Bykov, Igor Meglinski
Summary: This paper investigates the origin of unpolarized light resulting from the backscattering of circularly polarized light by a random turbid tissue-like disperse medium. The dynamics of the backscattered fraction of unpolarized light is revealed, showing its meticulous decomposition into two rigorously polarized components. The results obtained have significant implications for future studies in tissue polarimetry and light vortices.
Article
Optics
Mei Chen, Yanghong Wang, Wei Li, Min Xia, Ziqiang Meng, Li Xia
Summary: In this study, a novel integrated dual-angle DLS prototype was designed to measure particle size by combining microfluidic chip and fiber optic probes. The instrument achieved high accuracy at high concentrations and small sample consumption using a linear regression model for calibration. Additionally, the implementation of dual-angle online measurement in the fiber DLS system with microfluidic chip showed improved repeatability compared to single-angle DLS measurement.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Yan Han, Lei Ding, Yingping Wang, Haiyang Zheng, Li Fang
Summary: We developed an experimental apparatus that combines polarized light scattering and angle-resolved light scattering measurement technologies to quickly identify the shape of individual aerosol particles. By statistically analyzing the scattered light data of Oleic acid, rod-shaped Silicon dioxide, and other particles with typical shape characteristics, we used the partial least squares discriminant analysis (PLS-DA) method to analyze the scattered light of aerosol samples based on particle size screening. We established a shape recognition and classification method for individual aerosol particles based on nonlinear processing and grouping of spectral data with the area under the receiver operating characteristic curve (AUC) as a reference. Experimental results demonstrate that this classification method can effectively discriminate between spherical, rod-shaped, and other non-spherical particles, providing valuable information for atmospheric aerosol measurement and facilitating traceability and exposure hazard assessment of aerosol particles.
Article
Optics
Ju Wang, Zhiwei Cui, Yiyu Shi, Shenyan Guo, Fuping Wu
Summary: In this work, a scheme of vortical differential scattering (VDS) was utilized to investigate the chiroptical responses of dielectric chiral particles to the twisted light. The simulation results showed that the dielectric chiral particles have obvious VDS signals under the illumination of twisted light with opposite topological charges. These findings are expected to find potential applications in the detection and identification of chiral substances.
Article
Nanoscience & Nanotechnology
Liudmila Trotsiuk, Alina Muravitskaya, Olga Kulakovich, Dmitry Guzatov, Andrey Ramanenka, Yusuf Kelestemur, Hilmi Demir, Sergey Gaponenko
Article
Nanoscience & Nanotechnology
O. Kulakovich, L. Gurinovich, Hui Li, A. Ramanenka, L. Trotsiuk, A. Muravitskaya, Jing Wei, Hongbo Li, N. Matveevskaya, D. Guzatov, S. Gaponenko
Summary: The study reports the impact of gold and silver plasmonic films on the photoluminescence and photostability of InP/ZnSe/ZnSeS/ZnS nanocrystals. Gold enhances photostability by reducing exciton lifetime, while silver reduces photostability without affecting photoluminescence intensity. Adjusting excitation wavelength and using a polyelectrolyte spacer can enhance luminescence intensity.
Review
Physics, Multidisciplinary
V. V. Klimov
Summary: The study of optical systems at nanoscales is crucial for creating optical and quantum computers, biosensors, DNA sequencing devices, and detectors of various fields. The properties of elementary quantum systems, such as pumping rates and decay rates, change in the nanoenvironment, which can be utilized to create nanosize light sources with desired properties. Modern research focuses on controlling the emission of elementary quantum systems using plasmonic and dielectric nanostructures, metamaterials, and metamaterial nanoparticles.
Article
Physics, Condensed Matter
D. V. Guzatov, S. V. Gaponenko, O. I. Tevel
Article
Nanoscience & Nanotechnology
Reza Heydarian, Vasily Klimov, Constantin Simovski
Summary: This paper explains how to dramatically increase the external near-field effect by replacing a plane wave or a Gaussian beam with a fully symmetric diffraction-free beam. This leads to deeply subwavelength focusing of the incident beam near the rear edge of the microcylinder, accompanied by a significant enhancement of the local electric intensity.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2021)
Article
Optics
V Klimov, R. Heydarian, C. Simovski
Summary: In this study, the general concept of Fano resonance is examined to demonstrate its potential in space. By analyzing the electromagnetic fields near microspheres of different optical sizes and permittivity values, a spatial Fano resonance phenomenon is theoretically revealed. This newly discovered effect can be utilized for engineering submicrometer optical traps with unique and useful properties.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Physical
Sergey Gaponenko, Dmitry Guzatov, Natalia D. Strekal
Summary: Theoretical demonstration of domination of anti-Stokes Raman scattering enhancement over Stokes scattering in plasmonic nanostructures through photon LDOS engineering is possible. The dimer model provides a reasonable explanation for experimental data, showing promotion and inhibition of anti-Stokes scattering depending on laser wavelength.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Alina Muravitskaya, Artur Movsesyan, Dmitry Guzatov, Anne-Laure Baudrion, Pierre-Michel Adam, Sergey Gaponenko, Remi Vincent
Summary: This study investigates the influence of high-refractive index dielectric nanoparticles on the optical transition probability of emitters. The results show that by tuning the spectral positions of the magnetic and electric modes of the nanoparticles, a high inhibition rate can be achieved for emitters with different orientations, and the inhibition effect is not sensitive to the variation of distance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Anna A. Lizunova, Dana Malo, Dmitry Guzatov, Ivan S. Vlasov, Ekaterina Kameneva, Ivan A. Shuklov, Maxim N. Urazov, Andrei A. Ramanenka, Victor V. Ivanov
Summary: This paper investigates the UV luminescence enhancement of zinc oxide nanoparticles in the presence of aluminum nanoparticles. The experimental results of colloid mixtures and nanostructures are consistent with the theoretical models.
Article
Optics
Vasily Klimov
Summary: A hypothesis is proposed for the existence of perfect nonradiating modes in dielectric nanoparticles of an arbitrary shape. It is mathematically proven that such modes exist in axisymmetric dielectric nanoparticles and have unlimited radiation quality factors. By smartly tuning the excitation beams, perfect modes can appear as deep minima in the scattered radiation spectra (even complete disappearance), while experiencing substantial amplification of the fields inside the particle.
Article
Physics, Multidisciplinary
Sergey Gaponenko, Denis Novitsky, Dmitry Guzatov
Summary: Plasma has a dielectric permittivity less than 1 and supports electromagnetic wave propagation for frequencies higher than plasma frequency. This leads to lower photon density of states (DOS) than in vacuum, resulting in subnatural spectral linewidths, sub-Planckian spectrum of thermal radiation, and sub-Rayleigh scattering. Dissipative losses make the DOS effects smaller, but not vanishing, and can also cause indefinite growth of DOS in the low-frequency limit.
Article
Optics
Vasily V. Klimov, Dmitry V. Guzatov
Summary: With the help of the original mathematical method for solving Maxwell's equations, it is shown that there are perfect invisibility modes or perfect non-scattering modes in dielectric waveguides. These modes allow light to propagate in free space at specific eigenfrequencies, making the optical fiber invisible and minimizing scattering losses. The properties of these modes in waveguides of circular and elliptical cross-sections are analyzed in detail.
Article
Materials Science, Multidisciplinary
V Klimov, R. Heydarian, C. Simovski
Summary: In this paper, it is theoretically shown that a pair of plane waves impinging on a glass microcylinder under certain conditions may have a higher impact of evanescent waves, resulting in the suppression of the electromagnetic field in a specific area. This area, located in free space along the axis of the microcylinder, may serve as a linear optical trap for cold atoms and ions.
Article
Materials Science, Multidisciplinary
Y. Liang, Q. Gaimard, V Klimov, A. Uskov, H. Benisty, A. Ramdane, A. Lupu
Summary: By modulating the gain and loss levels of the medium, high-contrast tunable metasurfaces can be efficiently implemented, providing practical operability for the design model.
