Article
Chemistry, Multidisciplinary
Svetlana M. Posokhova, Vladimir A. Morozov, Egor M. Zonov, Dina V. Deyneko, Dmitry A. Spassky, Fedor D. Fedyunin, Alexei A. Belik, Erzhena T. Pavlova, Andrey A. Vasin, Bogdan I. Lazoryak
Summary: The effects of composition and preparation conditions of palmierite-type K5Yb1-xEux(MoO4)(4) (KYEMO) compounds on their structural and luminescence properties were investigated. Three modifications, α-phase, β-phase, and γ-phase, were obtained and characterized. The luminescence characteristics of the KYEMO solid solutions were studied, and the influence of concentration and synthesis conditions on the luminescence intensities were observed. The K5Yb1-xEux(MoO4)(4) phosphors show great potential for near UV-WLEDs due to their structural and optoelectronic characteristics.
Article
Multidisciplinary Sciences
Hyesung Jo, Dae Han Wi, Taegu Lee, Yongmin Kwon, Chaehwa Jeong, Juhyeok Lee, Hionsuck Baik, Alexander J. Pattison, Wolfgang Theis, Colin Ophus, Peter Ercius, Yea-Lee Lee, Seunghwa Ryu, Sang Woo Han, Yongsoo Yang
Summary: This study determines the 3D atomic structure of Pd@Pt core-shell nanoparticles and reveals the surface-interface strain relations. The strain distribution shows shape-dependent anisotropy, and the surface oxygen reduction reaction activity is predicted. These findings have important implications for understanding the structure-property relationships in strain-engineered core-shell systems and exerting direct control over catalytic properties.
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Harsharan Singh Bhatia, Andreas-David Brunner, Furkan Oeztuerk, Saketh Kapoor, Zhouyi Rong, Hongcheng Mai, Marvin Thielert, Mayar Ali, Rami Al-Maskari, Johannes Christian Paetzold, Florian Kofler, Mihail Ivilinov Todorov, Muge Molbay, Zeynep Ilgin Kolabas, Moritz Negwer, Luciano Hoeher, Hanno Steinke, Alina Dima, Basavdatta Gupta, Doris Kaltenecker, Ozum Sehnaz Caliskan, Daniel Brandt, Natalie Krahmer, Stephan Mueller, Stefan Frieder Lichtenthaler, Farida Hellal, Ingo Bechmann, Bjoern Menze, Fabian Theis, Matthias Mann, Ali Ertuerk
Summary: DISCO-MS is a technology that combines various methods for 3D imaging and proteome analysis of large biological specimens, providing opportunities for diagnosis and treatment of complex diseases.
Editorial Material
Optics
Kosmas L. Tsakmakidis, Tomasz P. Stefanski
Summary: Topological features, particularly nodal rings, which usually require three-dimensional structures, have been experimentally demonstrated in a simple one-dimensional photonic crystal, representing a significant breakthrough.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Juntao Wang, Fang Xu, Fangmei Liu, Dong Zhao
Summary: The study reveals that optical bistability, tristability, and multistability can be achieved in a complex structure composed of graphene and dielectric multilayers by optimizing the structure and tuning the incident wavelength. This paves the way for new types of all-optical multivalued switches, optical logic elements, and optical storage devices.
Article
Nanoscience & Nanotechnology
Zizheng Wang, Hao Jiang, Guangfu Wu, Yi Li, Teng Zhang, Yi Zhang, Xueju Wang
Summary: This study reports a method for programmable three-dimensional microfluidic structures assembled from polydimethylsiloxane (PDMS) and shape-memory polymers (SMPs). The approach allows for the creation of diverse geometries and the ability to program temporary shapes, with well-maintained fluid flow during deformation and shape recovery.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Fluids & Plasmas
Zbigniew Walczak, Jaroslaw H. Bauer
Summary: Parrondo's effect, a well-known paradox in biased random walks, can not only occur in one-dimensional discrete quantum walks with regular coin sequences, but also with irregular coin sequences, affecting the quantum entanglement between the walker and the coin.
Article
Optics
Yuttana Intaravanne, Ruoxing Wang, Hammad Ahmed, Yang Ming, Yaqin Zheng, Zhang-Kai Zhou, Zhancheng Li, Shuqi Chen, Shuang Zhang, Xianzhong Chen
Summary: In this study, we propose and experimentally demonstrate a method for achieving color-selective three-dimensional (3D) polarization structures using a single metasurface. By controlling the incident wavelengths, different polarization structures can be achieved in the same observation region, providing polarization control with color information in 3D space.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Physical
Zhi Zhao, Xiahui Chen, Jiawei Zuo, Ali Basiri, Shinhyuk Choi, Yu Yao, Yan Liu, Chao Wang
Summary: A three-dimensional DNA rack (DR) structure is proposed to assemble single emitters within ultra-small plasmonic nanocavities formed by closely coupled gold nanorods (AuNRs) with high precision. The unique saddle shape of DR allows linear alignment of AuNRs with tight gaps, resulting in nanocavities with high Q factors. By incorporating a DNA docking strand, single fluorescent emitters can be positioned within the nanocavities, leading to significant enhancements in fluorescence intensity and reduction in emission lifetime, demonstrating strong emitter-cavity interactions.
Article
Engineering, Mechanical
Na Qiu, Jiazhong Zhang, Cunyi Li, Yijun Shen, Jianguang Fang
Summary: This study proposed a three-dimensional functionally graded TPMS structure to accommodate multi-directional loading conditions in real-life applications. The FG-3D Primitive (P) and Gyroid (G) structures showed higher energy absorption capacity compared to uniform counterparts, absorbing 45.3% and 12% more energy, respectively, under different loading directions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Environmental Sciences
Xiaocong Xu, Jinpei Ou, Penghua Liu, Xiaoping Liu, Honghui Zhang
Summary: Research on the relationship between urban structures and CO2 emissions in mainland China found that three-dimensional urban structures play a crucial role in influencing CO2 emissions. Factors such as total building volume, building height, and heat dissipation area were identified as key drivers of CO2 emissions. While compact urban building coverage at a two-dimensional scale can reduce CO2 emissions, an intense and congested pattern in three-dimensional space may lead to higher CO2 emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Thermodynamics
Wei Li
Summary: Developing novel enhanced surface tubes is an important approach to improve two-phase flow heat transfer. However, accurately predicting the heat transfer correlations in enhanced tubes has been a challenging task. This paper presents a method to directly develop two-phase heat transfer correlations in enhanced tubes based on existing smooth tube models, by introducing modifying factors and dimensionless numbers. The method is supported by theoretical analysis and experimental studies, and new correlations are successfully developed in an enhanced heat transfer tube as an example.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
A. Gorbunova, G. Balarac, L. Canet, G. Eyink, V. Rossetto
Summary: The study uses direct numerical simulations to test recent theoretical predictions in a three-dimensional incompressible fluid. Results show agreement with predictions from the Functional Renormalization Group (FRG) and can be explained as a consequence of sweeping. Additionally, there is a crossover in the two-point spatiotemporal correlations of the velocity modulus from Gaussian to exponential decay.
Article
Optics
Luca Dal Negro, Yuyao Chen, Sean Gorsky, Fabrizio Sgrignuoli
Summary: This paper proposes a new approach to enhance the efficiency of the two-photon spontaneous emission process through the multifractal optical mode density of photonic structures based on aperiodic distributions. The results demonstrate significantly enhanced emission rates by exciting highly resonant states across broadband multifractal spectra.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Gennadiy Burlak, A. Diaz-de-Anda, Boris A. Malomed, E. Martinez-Sanchez, G. Medina-Angel, R. Morales-Nava, J. J. Martinez-Ocampo, M. E. de-Anda-Reyes, A. Romero-Lopez
Summary: We systematically study the localization of light fields in a three-dimensional disordered percolating system with light nanoemitters. The clusters in this hybrid medium form a fractal radiation pattern, where light is emitted and scattered by the disordered structures simultaneously. Theoretical simulations reveal nontrivial dynamics in the form of localized field bunches. The length of field localization and dynamical properties are obtained as functions of the occupation probability of the disordered clusters. A transition between dynamical states and narrow point-like fields pinned to the emitters is observed. Experimental results confirm the theoretical predictions.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Optics
Christina Joerg, Sachin Vaidya, Jiho Noh, Alexander Cerjan, Shyam Augustine, Georg von Freymann, Mikael C. Rechtsman
Summary: Weyl points are point degeneracies in the momentum space of 3D periodic materials, associated with a quantized topological charge. This study experimentally observed the splitting of a quadratic Weyl point into two linear Weyl points in a 3D micro-printed photonic crystal. The theoretical analysis showed that this splitting occurs along high-symmetry directions in the Brillouin zone, which is important for the development of robust topological devices in the near-infrared.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
J. Schulz, C. Joerg, G. von Freymann
Summary: This study experimentally demonstrates that the next-nearest-neighbor coupling in a waveguide array can be naturally negative. By fabricating dielectric zig-zag shaped waveguide arrays and adjusting the angle of the zig-zag shape, it is possible to tune the coupling ratios between positive and negative values, as well as reduce the impact of the coupling to zero at certain angles. The existence of negative couplings is confirmed experimentally and the improved accuracy of a refined tight-binding model is shown. These findings are also important for studying other discrete systems where the tight-binding model is commonly used.
Article
Optics
Bjoern Haase, Mirco Kutas, Felix Riexinger, Patricia Bickert, Andreas Keil, Daniel Molter, Michael Bortz, Georg von Freymann
Summary: This erratum corrects two typing errors in a previously published manuscript, which were limited to theoretical derivation and did not affect numerical calculations, results, or conclusions.
Article
Optics
Tobias Pfeiffer, Jens Klier, Georg von Freymann, Daniel Molter
Summary: Nonlinear frequency conversion provides an elegant method for detecting low-energy photons with different wavelengths from the pump wavelength while providing phase information. We propose a phase-sensitive measurement method in the terahertz spectral range using visible light, which enables fast determination of layer thicknesses and achieves phase-resolved detection of terahertz pulses with standard equipment.
Article
Chemistry, Multidisciplinary
Daniel Molter, Kim-Sophie Ellenberger, Jens Klier, Stefan Duran, Joachim Jonuscheit, Georg von Freymann, Nico Vieweg, Anselm Deninger
Summary: The acquisition speed of terahertz time-domain spectroscopy systems has been significantly improved in recent years, making waveform acquisition rates in the kilohertz range feasible. This study presents measurements of sub-wavelength layers in multilayer systems at a rate of 1.6 kHz, allowing real-time analysis of individual layer thicknesses. By combining rotation of the samples with linear translation of the measurement head, the measurement yield is maximized. The ECOPS system, with its single-shot dynamic range of 40 dB and bandwidth above 3 THz, achieves sub-micron repeatability for each layer.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Nicolas Lang, Sven Enns, Julian Hering, Georg von Freymann
Summary: This study presents a simple, fast, and easily implementable algorithm for predicting the final structure topography in multi-photon lithography. The algorithm approximates the three main steps of lithography and shows promising results in agreement with experimental observations. The use of a Downhill-Simplex algorithm for parameter optimization significantly reduces deviations and enables the production of highly conformal and high-quality microstructures.
Article
Materials Science, Multidisciplinary
Ruben C. R. Pompe, Dominic T. Meiers, Walter Pfeiffer, Georg von Freymann
Summary: This study presents a method for identifying different coherent light transport mechanisms using time and spatially resolved coherent light scattering spectroscopy. The results show that about 20% of the scattered light in ultrathin brilliant scattering media originates from weakly localized random photonic modes, rather than solely diffusive light transport.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Bjorn Erik Haase, Joshua Hennig, Mirco Kutas, Erik Waller, Julian Hering, Georg von Freymann, Daniel Molter
Summary: Sensing with undetected photons in the infrared region is achieved through polarization-optics-based phase-quadrature implementation in a nonlinear interferometer. This allows for obtaining phase and visibility information with a single image acquisition without the need for phase variation, enabling the detection of dynamic processes. The method is demonstrated on both static and dynamic measurement tasks, showcasing its effectiveness.
Article
Optics
Felix Paries, Oliver Boidol, Georg von Freymann, Daniel Molter
Summary: This study aims to improve the performance of terahertz time-domain spectroscopy systems by reducing timing errors in electronic phase detection. The results show a significant improvement in both terahertz bandwidth and signal-to-noise ratio, leading to a more accurate measurement of multi-layer thickness.
Article
Materials Science, Multidisciplinary
Dominic T. Meiers, Maximilian Rothammer, Maximilian Maier, Cordt Zollfrank, Georg von Freymann
Summary: The great flexibility of direct laser writing (DLW) comes from the ability to fabricate precise 3D structures in small scales and the wide range of applicable materials. This study reports a new bio-sourced resist using chitin as the monomeric unit, paving the way for non-hydrogel resists. It is also shown that using two photoinitiators is more advantageous than using a single one, where the first one acts as a sensitizer and transfers energy to the second one for initiating polymerization.
ADVANCED ENGINEERING MATERIALS
(2023)
Editorial Material
Optics
C. O. R. D. T. Zollfrank, H. U. Cao, G. E. O. R. G. VON Freymann, P. A. R. I. N. D. A. Vasa, Helge-otto Fabritius, A. R. T. Agrawal
Summary: Tailored disorder is an emerging design concept that explores the photonic properties of material composites with deliberately introduced irregularities. This rapidly developing field combines inspiration from biology, physics, and chemistry to create advanced photonic materials with interesting properties.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Maximilian Rothammer, Dominic T. Meiers, Maximilian Maier, Georg Von Freymann, Cordt Zollfrank
Summary: Novel bifunctional cellulose diacetate derivatives were synthesized for bio-based photoresists that can be structured by two-photon absorption via direct laser writing (DLW) without the need for a photoinitiator. Thiol moieties and olefinic or methacrylic side groups were functionalized on cellulose diacetate to achieve thiol-conjugated cross-linking. These cellulose derivatives can also be photo-cross-linkable via UV irradiation (λ = 254 nm and 365 nm) without using an initiator.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Instruments & Instrumentation
Matthias R. Schweizer, Franziska Kuehn, Malte Koster, Georg von Freymann, Burkard Hillebrands, Alexander A. Serga
Summary: Temperature variations can be used to create reconfigurable spatial structures in physical and biological objects. This paper presents an experimental optical setup for creating tunable two-dimensional temperature patterns on a micrometer scale, and demonstrates its practical application in the production of temperature-induced magnetization landscapes in ferrimagnetic yttrium iron garnet films.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Computer Science, Information Systems
Karl H. May, Andreas Keil, Georg Von Freymann, Fabian Friederich
Summary: Terahertz tomography is a non-contact inspection technique that reconstructs 3D volume of objects by imaging them from multiple angles and using intensity and time-of-flight transmission data. Diffraction and refraction limitations of terahertz radiation are addressed by applying ray tracing and prior knowledge of the sample to predict beam paths. Two reconstruction methods are presented, one filters out strongly deviating beams to remove artifacts, and the other employs off-axis measurements to detect strongly deflected beams and enhance image quality.
Review
Quantum Science & Technology
Mirco Kutas, Bjoern Erik Haase, Felix Riexinger, Joshua Hennig, Patricia Bickert, Tobias Pfeiffer, Michael Bortz, Daniel Molter, Georg von Freymann
Summary: Optical nonlinear conversion processes are widely used in scientific and industrial applications. One important application is the generation of paired signal and idler photons. However, in the past, only one of the photons was utilized. New quantum measurement methods enable the usage of both photons and the transfer of information between different spectral ranges, which is particularly important in extreme frequency ranges.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
