Article
Astronomy & Astrophysics
Rebecca Centeno, Matthias Rempel, Roberto Casini, Tanausu del Pino Aleman
Summary: The study investigates the impact of finite spectral resolution on the accuracy of magnetic field measurements obtained from the cores of Mg ii h and k lines using the weak-field approximation. Results show that as the spectral resolution decreases, the accuracy of the measurements is degraded, resulting in inference bias.
ASTROPHYSICAL JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Rohan Pokratath, Laurent Lermusiaux, Stefano Checchia, Jikson Pulparayil Mathew, Susan Rudd Cooper, Jette Katja Mathiesen, Guillaume Landaburu, Soham Banerjee, Songsheng Tao, Nico Reichholf, Simon J. L. Billinge, Benjamin Abecassis, Kirsten M. O. Jensen, Jonathan De Roo
Summary: In this study, the nucleation and growth of zirconia nanocrystals from zirconium chloride and zirconium isopropoxide were investigated using various analysis methods. It was found that amorphous particles nucleate into nanocrystals through a second order process, and they are also the source of nanocrystal growth. By using different zirconium precursors, the precursor decomposition rate and nanocrystal size can be controlled. These findings are expected to aid in the further development of colloidal syntheses.
Article
Chemistry, Physical
Takayuki Kumada, Hiroshi Nakagawa, Daisuke Miura, Yurina Sekine, Ryuhei Motokawa, Kosuke Hiroi, Yasuhiro Inamura, Takayuki Oku, Kazuki Ohishi, Toshiaki Morikawa, Yukihiko Kawamura, Kiyoshi Kawai
Summary: Spin-contrast-variation (SCV) small-angle neutron scattering (SANS) is a technique used to determine the nanostructure of composite materials by analyzing the scattering of polarized neutrons. In this study, SCV-SANS was used to analyze the structure of nanoice crystals in rapidly frozen sugar solutions. The results showed that the nanoice crystals had a planar structure with a radius larger than several tens of nanometers and a thickness of 2.5±0.5 nm. Furthermore, the glucose molecules were found to preferentially bind to a specific face of the nanoice crystals, inhibiting growth perpendicular to that face.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Yongtao Liu, Rama K. K. Vasudevan, Kyle P. Kelley, Hiroshi Funakubo, Maxim Ziatdinov, Sergei V. V. Kalinin
Summary: We developed automated experiment workflows for identifying the best predictive channel in spectroscopic measurements. The approach combines ensembled deep kernel learning for probabilistic predictions and reinforcement learning for channel selection. The implementation in multimodal imaging of piezoresponse force microscopy (PFM) showed that the amplitude is the best predictive channel for polarization-voltage and frequency-voltage hysteresis loop areas. This workflow and code can be applied to other multimodal imaging and local characterization methods.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Optics
Tomonori Tanikawa, Kazuhiko Masuda, Hiroshi Ishimoto, Teruo Aoki, Masahiro Hori, Masashi Niwano, Akihiro Hachikubo, Sumito Matoba, Konosuke Sugiura, Takenobu Toyota, Nozomu Ohkawara, Knut Stamnes
Summary: The study discovered the existence of neutral points in the polarization features of snow and bare ice surfaces in the shortwave infrared regions, which are related to scattering properties; the DoLP for snow cases was represented by measurement geometry and scattering phase matrix, while for bare ice cases, it was represented by measurement geometry and Fresnel reflection matrix; the angular dependence of the neutral points is primarily linked to the measurement geometry, regardless of snow particle size, shape, and scattering/absorbing inclusions.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Optics
Jianwen Meng, Wenyi Ren, Ruoning Yu, Xu Ma, Gonzalo R. Arce, Dan Wu, Rui Zhang, Yingge Xie
Summary: Polarization image fusion is crucial in polarization imaging applications. Most existing algorithms focus on fusing intensity and degree of linear polarization, but overlook the information encoded in the angle of linear polarization. This study proposes a learning-based model to fuse polarization images and demonstrates its effectiveness through experiments.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Materials Science, Multidisciplinary
Ahmed Mahfuz Tamim, Md Mehedi Hasan, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam, Jamel Nebhen
Summary: The metasurface absorber developed using binary-coded unit cells showed excellent polarization insensitivity and tunable characteristics. The absorber's structure optimization and performance analysis were conducted using an electromagnetic simulator, resulting in satisfactory absorption effects.
RESULTS IN PHYSICS
(2021)
Article
Optics
Guangsheng Deng, Zhenchun Yu, Linjie Wang, Jun Yang, Zhiping Yin, Ying Li
Summary: This Letter presents a broadband and wide-angle linear polarization converter based on a 3D resonator for cross-polarization conversion. The designed structure achieves a polarization conversion ratio of over 90% in the frequency range of 16.32 to 34.12 GHz, with a relative bandwidth of 70.6%. Additionally, it demonstrates broad angle stability and a miniaturized configuration. The proposed design exhibits excellent bandwidth, wide-angle performance, and miniaturization advantages compared to traditional polarization converters based on planar resonant structures.
Article
Optics
Yue Wang, Yongkai Yin, Xiulun Yang, Qian Sun, Xiangfeng Meng, Guoliang Shentu, Baoqing Sun
Summary: Polarimetric image dehazing is a widely investigated method that improves the quality of dehazed images by considering additional information, especially for transparent objects.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Zunyi Sun, Weiqi Jin, Guoguo Kang, Li Li, Jianguo Yang
Summary: This paper proposes a temperature-controlled mid-wave infrared polarization radiation source with adjustable degree of linear polarization (DoLP) for the polarization performance measurements. The experimental results show that the source exhibits a large dynamic range and high accuracy, which can effectively improve the quantitative accuracy of infrared polarization imaging systems.
Article
Chemistry, Multidisciplinary
Ziyi Miao, Cindy Y. Zheng, George C. Schatz, Byeongdu Lee, Chad A. Mirkin
Summary: The study focuses on assembling nanoparticles of different shapes using DNA on substrates and investigating their reorganization into two-dimensional crystalline films under thermal conditions. Two new low-density 2D structures were reported, including a honeycomb lattice based on octahedral nanoparticles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Azzaya Khasbaatar, Andrew Cheng, Austin L. Jones, Justin J. Kwok, Sang Kyu Park, Jessica K. Komar, Oliver Lin, Nicholas E. Jackson, Qian Chen, Dean M. DeLongchamp, John R. Reynolds, Ying Diao
Summary: The aggregation of conjugated polymers in solution is crucial for the morphology and performance of bulk heterojunction organic solar cells (OSCs). However, the specific structures of polymer aggregates in solution and their effects on OSC morphology and performance have not been extensively studied. In this study, we investigate the impact of polymer aggregate structures on the morphology and processing resilience of OSCs using a benzodithiophene-based donor polymer (PM7) and its ester-functionalized derivatives (PM7 D1 and D2). Our results show that PM7 solution forms a combination of semi-crystalline fiber aggregates and amorphous polymer chain network aggregates, while PM7 D1 and D2 solutions primarily form amorphous network aggregates through sidechain associations. Interestingly, the fiber aggregates of PM7 break down at elevated solution temperatures, while the polymer network aggregates remain stable. This temperature-dependent behavior leads to highly processing temperature-sensitive performance in blade-coated devices fabricated from PM7 and ITIC-4F, whereas PM7 D1 and D2 polymers exhibit improved processing temperature resiliency. Furthermore, we find that amorphous, network-like aggregates contribute to superior device performance in blade-coated OSCs due to the formation of blend films with short pi-pi stacking distance, small domain spacing, and face-on preferred molecular orientation. Conversely, fiber-like aggregates result in large pi-pi stacking distance, large domain spacing, and isotropic molecular orientation, which degrade device performance.
CHEMISTRY OF MATERIALS
(2023)
Article
Astronomy & Astrophysics
T. Kolar, S. J. Paul, P. Achenbach, H. Arenhoevel, A. Ashkenazi, J. Bericic, R. Boehm, D. Bosnar, T. Brecelj, E. Cline, E. O. Cohen, M. O. Distler, A. Esser, I Friscic, R. Gilman, C. Giusti, M. Heilig, M. Hoek, D. Izraeli, S. Kegel, P. Klag, I Korover, J. Lichtenstadt, I Mardor, H. Merkel, D. G. Middleton, M. Mihovilovic, J. Mueller, U. Mueller, M. Olivenboim, E. Piasetzky, J. Pochodzalla, G. Ron, B. S. Schlimme, M. Schoth, F. Schulz, C. Sfienti, S. Sirca, R. Spreckels, S. Stajner, Y. Stoettinger, S. Strauch, M. Thiel, A. Tyukin, A. Weber, I Yaron
Summary: This study presents measurements of electron helicity asymmetry in quasi-elastic proton knockout from H-2 and C-12 nuclei using polarized electrons. The results show that the helicity asymmetry depends on the final state of the residual system, with larger values observed for p-shell knockout from C-12 and smaller values for s-shell knockout from both C-12 and H-2. The experimental data for H-2 are in good agreement with theoretical calculations, while there are differences between the predictions and data for C-12.
Article
Polymer Science
Roisin A. O'Connell, William N. Sharratt, Nico J. J. Aelmans, Julia S. Higgins, Joao T. Cabral
Summary: The conformation of poly(2,6-diphenyl-p-phenylene oxide) (PPPO) in good and mixed solvents was investigated using small-angle neutron scattering (SANS). The polymer conformation below the overlap concentration is well described by the polymer-excluded volume model, while above it is described by the Ornstein-Zernike expression with a correlation length xi dependent on the concentration and solvent/nonsolvent ratio. Additionally, the characteristic particle radius of polymer nanoparticles scales with polymer concentration and nonsolvent content, while the solution volume per precipitated particle remains nearly constant.
Article
Engineering, Electrical & Electronic
Jianjia Hu, Pei-Ling Chi, Tao Yang
Summary: This article proposes a novel reconfigurable reflectarray (RRA) with 1 bit beam scanning and switchable linear, left-handed (LH) circular, or right-handed (RH) circular polarization. A 10 x 10 RRA was prototyped with each unit cell using only two p-i-n diodes to implement dual functions. The fabricated RRA can experimentally demonstrate 2-D beam scanning and polarization switching among 45 degrees/135 degrees linear polarization and LH/RH circular polarization.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Optics
Javier Gonzalez-Colsa, Guillermo Serrera, Jose M. Saiz, Francisco Gonzalez, Fernando Moreno, Pablo Albella
Summary: Optical biosensing is a highly active research area in demand of selective, sensitivity-enhanced, and low-cost devices. This work proposes a novel grating-based gold metasurface that acts as both a high sensitivity sensor and unidirectional plasmon source. Understanding the influence of each parameter on the device's performance is crucial for designing biosensors based on grating structures.
Article
Biochemistry & Molecular Biology
Angela Barreda, Pablo Albella, Fernando Moreno, Francisco Gonzalez
Summary: The study found that HRID nanoparticles forming dimers can efficiently redirect incident radiation towards the forward direction, and increase the radiation scattered into a silicon photovoltaic wafer on a graded-index multilayer substrate. These results provide guidance for the design of novel solar cells.
Article
Chemistry, Multidisciplinary
Juan D. Olarte-Plata, Jordan Gabriel, Pablo Albella, Fernando Bresme
Summary: The study focuses on utilizing Janus nanoparticles with different compositions to control temperature field distribution and achieve anisotropic heating at the nanoscale. Through simulations and experiments, it is found that the contrasting interfacial thermal conductances of JNPs can lead to temperature difference between both sides of the nanoparticle, thereby affecting the interfacial fluid temperature.
Article
Optics
Javier Gonzalez-Colsa, Guillermo Serrera, Jose Maria Saiz, Dolores Ortiz, Francisco Gonzalez, Fernando Bresme, Fernando Moreno, Pablo Albella
Summary: This study compares the thermoplasmonic response of different nanoparticle geometries and finds that doughnut-shaped nanoparticles have a superior tunable photothermal response under practical illumination conditions. The heating of nanoparticles in fluidic environments strongly depends on the particle orientation with respect to the illumination source. It is concluded that nanodoughnuts are the best nanoheaters with weak dependence on orientation, making them ideal for photothermal therapy applications.
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Andrea Fernandez-Perez, Saul A. Rosales, Cornel Cobianu, Marin Gheorghe, Mircea Modreanu, Jose M. Saiz, Fernando Moreno, Maria Losurdo
Summary: In this study, imaging polarimetry and spectroscopic ellipsometry were used to reveal and directly measure the optical properties of Sb(2)S(3) in crystalline and amorphous states. The results show that Sb(2)S(3) crystallites exhibit strong anisotropy and low losses, while the amorphous films are optically isotropic.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Physical
Javier Gonzalez-Colsa, Juan D. Olarte-Plata, Fernando Bresme, Pablo Albella
Summary: This study proposes a spectrally tunable anapole nanoheater based on a dielectric anapole resonator. It can control the light-matter interaction and shift the thermal response from the shortwave infrared range to the near-infrared range.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Guillermo Serrera, Javier Gonzalez-Colsa, Vincenzo Giannini, Jose M. Saiz, Pablo Albella
Summary: This work presents a numerical proof of concept for a novel approach to chiral sensing using the directional emission of Surface Plasmon Polaritons (SPPs) on a metasurface. By measuring the polarization-dependent SPP differential emission, the chiroptical properties of molecules can be detected. The proposed method shows potential for faster, real-time measurements.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Optics
Gonzalo Santos, Marin Georghe, Cornel Cobianu, Mircea Modreanu, Maria Losurdo, Yael Gutierrez, Fernando Moreno
Summary: This paper presents a reconfigurable photodetector based on a metal-semiconductor configuration, utilizing hot-carrier and surface plasmons (SPs) hot-electron injection into semiconductors for narrowband photoresponse and sub-bandgap energy photodetection. By numerically studying the parameters of the dual-comb Au electrodes and the SP order, the absorption of the device is optimized, enabling tunable narrowband photodetection from the O telecom band to the C telecom band.
Article
Chemistry, Analytical
Maria Carcelen, Veronica Vidal, Alfredo Franco, Marcos Gomez, Fernando Moreno, Jose L. Fernandez-Luna
Summary: This article introduces a simple, fast and label-free method based on a gold nanohole array biosensor to detect the spectral response and changes in cell-matrix adhesion of cancer cells. The experimental results show that this biosensor can effectively distinguish different cell populations in the cell cycle and detect changes in cell-matrix interaction in real time.
Article
Chemistry, Multidisciplinary
Gonzalo Santos, Maria Losurdo, Fernando Moreno, Yael Gutierrez
Summary: All-dielectric metasurfaces are nanopatterned structures that have various applications and their optical behavior is determined by composition, dimensions, and environment. However, their functionality is fixed during fabrication, limiting their potential as reconfigurable devices. A reconfigurable all-dielectric metasurface based on high refractive index materials is proposed, which can control scattered light through phase-change chalcogenide antimony triselenide. The device consists of a 2D array of sandwich disks embedded in a SiO2 matrix.
Article
Chemistry, Analytical
Victor Garcia-Milan, Alfredo Franco, Margarita Estreya Zvezdanova, Sara Marcos, Ruben Martin-Laez, Fernando Moreno, Carlos Velasquez, Jose L. Fernandez-Luna
Summary: A nanostructured gold biosensor was used to distinguish between tumor tissue and peritumoral tissue in GBM patients based on differences in their optical properties. The biosensor showed a high sensitivity and specificity in discriminating between the two tissues, making it a potential tool for real-time intraoperative discrimination.
Article
Chemistry, Physical
Javier Gonzalez-Colsa, Fernando Bresme, Pablo Albella
Summary: This study investigates the impact of interfacial thermal conductance on the thermal relaxation of metal-polymer Janus nanoparticles under pulsed illumination. The results show that neglecting the temperature dependence of the thermophysical properties can lead to an overestimation of the nanoparticle temperature. A gold/polymer semishell nanostructure is presented as a reliable nanoheater candidate for photothermal therapies, offering significant temperature increment and directional heating.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Gonzalo Santos, Fabio Palumbo, Mircea Modreanu, Fernando Moreno, Maria Losurdo
Summary: In this study, the reversible non-volatile transition of molybdenum oxides was experimentally demonstrated, and its optical properties were investigated. The research results highlight the potential applicability of molybdenum oxides in metal-insulator transitions.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Physics, Multidisciplinary
Gonzalo Santos, Francisco Gonzalez, Dolores Ortiz, Jose Maria Saiz, Maria Losurdo, Yael Gutierrez, Fernando Moreno
Summary: This research focuses on designing a switchable on/off subpixel using a molybdenum oxide (MoOx) reflective grating, which can be controlled by the oxidation degree to cover a wide range of colors in the color space for reflective display applications.
