Article
Materials Science, Multidisciplinary
Kang Du, Pei Li, Heng Wang, Kun Gao, Rui-Bin Liu, Fanfan Lu, Wending Zhang, Ting Mei
Summary: The study found that maximum chirality enhancement can be achieved by adjusting the magnetic dipole resonance and anapole in coaxial air holes, and the chirality can be reversed in the vicinity of these points. Further improvement in optical chirality can be achieved by adjusting the hole radius, with the optimal enhancement factor reaching 39 and -23.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Liangliang Gu, Rong Shu, Xiangfeng Liu, Haifeng Hu, Qiwen Zhan
Summary: In this work, a diffractive circular dichroism enhancement technique using stereoscopic plasmonic molecule structures is proposed. The dominant chiral scattering mechanism is identified as the z-component of the electric dipole during the interaction between an individual plasmonic molecule and a grazing plane wave. Through the design of periodic plasmonic molecule structures, large diffractive circular dichroism can be achieved, which is validated by numerical simulations and experimental results. The proposed approach has potential application in enhanced spectroscopy techniques for measuring chiral information, crucial for fundamental physical and chemical research as well as bio-sensing applications.
Article
Chemistry, Multidisciplinary
Daehan Yoo, Avijit Barik, Fernando de Leon-Perez, Daniel A. Mohr, Matthew Pelton, Luis Martin-Moreno, Sang-Hyun Oh
Summary: The integration of plasmonics and electronics on a chip scale enables a wide range of applications in biosensing, signal processing, and optoelectronics. A novel split-trench resonator platform combining resonant plasmonic biosensors and RF nanogap tweezers has been demonstrated, allowing for active sample concentration and label-free detection of analytes. This manufacturing method shows promise for practical applications in biosensing, spectroscopy, and optoelectronics.
Article
Chemistry, Multidisciplinary
Sabine Portal, Carles Corbella, Oriol Arteaga, Alexander Martin, Trinanjana Mandal, Bart Kahr
Summary: Optically anisotropic materials form through colloidal lithography were studied using SEM, confocal microscopy, and polarimetry. A hexagonal array mask made of sub-micron silica particles was created via Langmuir-Blodgett self-assembly, and the pattern was transferred onto silicon and glass substrates using ion beam etching. Gold films were then deposited onto the etched pillars to enhance optical properties. Polarimetric measurements showed that the etching directions influenced the linear birefringence and linear dichroism, with the chiroptical responses increasing with the angle of incidence.
Article
Materials Science, Multidisciplinary
Pau Molet, Nicolas Passarelli, Luis A. Perez, Leonardo Scarabelli, Agustin Mihi
Summary: Ordered arrays of metal nanoparticles can generate surface lattice resonances with higher quality factors, showing great potential for engineering light-matter interactions. The internal architecture of gold-nanoparticle meta-molecules influences the optical response of plasmonic supercrystals.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Akash Buragohain, Gouree Shankar Das, Yatish Beria, Ahmed Jamal Abdullah Al-Gburi, Partha Protim Kalita, Trishna Doloi
Summary: This paper presents a highly sensitive differential Hexagonal Split Ring Resonator (HSRR) sensor operating at 5.3 GHz for characterizing the permittivity of organic liquids. The sensor design is based on a hexagonal shape, which allows for better field concentration and power transfer. The sensor is capable of accurately determining the complex permittivity of unknown liquid samples with high sensitivity and immunity to environmental fluctuations.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Multidisciplinary
Xiu Yang, Yong Liu, Fei-Liang Chen, Qian-Qi Lin, Rohit Chikkaraddy, Shan-Shan Huang, Shi-Lin Xian, Yi-Dong Hou, Jing-Lei Du, Liang-Ping Xia, Chun-Lei Du
Summary: This research introduces a stepwise colloidal lithography technique for the fabrication of scalable and complex chiral metamaterials (CMs). The use of multiple-step depositions expands the range of chiral patterns, and a flexible chiral device based on PDMS is designed with good performance and stability.
Article
Optics
Xiaocan Xu, Ruijia Xu, Yu-Sheng Lin
Summary: The research proposes a design of tunable double split-ring metamaterial in the terahertz frequency range, demonstrating switchable characteristics between single-resonance and dual-resonance with polarization sensitivity, within the frequency range of 0.16 THz to 0.21 THz. Tunability and stability of DSRM can be achieved by changing the gap between two SRRs or the distance between face-to-face SRRs.
OPTICS AND LASER TECHNOLOGY
(2021)
Review
Materials Science, Multidisciplinary
Eric S. A. Goerlitzer, Aniket S. Puri, Jebin J. Moses, Lisa V. Poulikakos, Nicolas Vogel
Summary: Chiral plasmonics, an intriguing research field, attracts scientists from diverse backgrounds including physicists, chemists, biologists, and material engineers. Overcoming issues such as understanding the physical background, avoiding pitfalls in characterization, and providing simple and robust methods is crucial for successful access to this interdisciplinary field.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Aditya Tripathi, Ha-Reem Kim, Pavel Tonkaev, Soon-Jae Lee, Sergey Makarov, Sergey S. Kruk, Mikhail Rybin, Hong-Gyu Park, Yuri Kivshar
Summary: Active dielectric metasurfaces composed of split-nanodisk resonators fabricated in InGaAsP membranes with embedded quantum wells were studied. These split-nanodisk resonators can operate in the optical anapole regime, supporting strongly localized fields and high-Q resonances. Room-temperature lasing was demonstrated from the anapole lattices of engineered active metasurfaces with low threshold and high coherence.
Article
Chemistry, Analytical
Alejandro Rivera-Lavado, Alejandro Garcia-Lamperez, Maria-Estrella Jara-Galan, Emilio Gallo-Valverde, Paula Sanz, Daniel Segovia-Vargas
Summary: This paper proposes a low-cost passive sensor for real-time permittivity characterization of hydrocarbon fluids. The sensor's characterization is performed through both full-wave simulation and measurements, demonstrating its effectiveness in discriminating different types of crude and estimating their properties.
Article
Nanoscience & Nanotechnology
Taiyu Okatani, Yuto Sunada, Kazuhiro Hane, Yoshiaki Kanamori
Summary: In this study, a new three-dimensional bulk metamaterial composed of randomly dispersed metal microstructures in bulk resin is proposed. Experimental results confirmed that the optical properties of the bulk metamaterial could be used in the terahertz band.
Article
Engineering, Environmental
Aida Javadian-Saraf, Ehsan Hosseini, Benjamin Daniel Wiltshire, Mohammad H. Zarifi, Mohammad Arjmand
Summary: This study developed a microwave-based SRR sensor for detecting ammonia gas with enhanced sensitivity by combining GO with PANI. The sensor demonstrates high sensitivity, selectivity, and repeatability, making it suitable for monitoring the concentration of ammonia gas in various applications.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Computer Science, Interdisciplinary Applications
Qiang Liu, Xiao Liang, Tingting Li, Weian Chao, Weizhi Qi, Tian Jin, Yubin Gong, Huabei Jiang, Lei Xi
Summary: Microwave-induced thermoacoustic imaging (MTAI) using low-energy and long-wavelength microwave photons has great potential in detecting deep-seated diseases by visualizing tissue's electric properties. However, the low contrast in conductivity between a target and the surroundings limits its sensitivity and hinders biomedical applications. To overcome this, a split ring resonator (SRR) topology based MTAI (SRR-MTAI) approach is developed, showing ultrahigh sensitivity in distinguishing saline concentrations and detecting tissue targets. In vitro and in vivo experiments demonstrate significant enhancement in imaging sensitivity, suggesting the potential of SRR-MTAI to tackle previously impossible biomedical problems.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2023)
Article
Multidisciplinary Sciences
Kun Ren, Pengwen Zhu, Taotao Sun, Junchao Wang, Dawei Wang, Jun Liu, Wensheng Zhao
Summary: This paper proposes a two-dimensional displacement sensor based on the diagonal symmetry complementary split-ring resonator (CSRR) structure. The CSRR structure is used to detect the displacement of the mover by varying the resonant frequency. The shape of the sensor is further optimized using the particle swarm algorithm to reduce the error caused by lateral displacement. The experimental results show that the sensor has high sensitivity.
Article
Chemistry, Multidisciplinary
Johannes Menath, Reza Mohammadi, Jens Christian Grauer, Claudius Deters, Maike Boehm, Benno Liebchen, Liesbeth M. C. Janssen, Hartmut Loewen, Nicolas Vogel
Summary: 2D colloidal crystallization is a simple strategy for producing defined nanostructure arrays over large areas. The study introduces a loudspeaker setup for the acoustic crystallization of 2D colloidal crystals at liquid interfaces, which increases the average grain size significantly. The process is optimized using frequency and amplitude of sound waves, and computer simulations show the mechanisms behind defect removal. The experimentally simple process provides access to highly defined nanostructure arrays for various research communities.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Marius Schoettle, Tobias Lauster, Lukas J. Roemling, Nicolas Vogel, Markus Retsch
Summary: Researchers have developed a general synthetic approach to creating continuous size gradient colloidal ensembles. By synthesizing a dispersion with a specifically designed gradual particle size distribution and then allowing self-assembly, they obtained a photonic colloidal glass with a continuous size gradient. Characterization methods demonstrated the potential of this mesostructure, including vivid structural colors and superior light scattering across the gradient.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Katharina E. Dehm, Teresa Walter, Matthias Weichselgartner, Ryan W. Crisp, Kirsten Wommer, Martin Aust, Nicolas Vogel
Summary: This study presents a sustainable coating process based on renewable materials to prepare surface coatings with superhydrophobic and liquid-infused properties. It uses natural drying oils as polymeric binder and silica particles for surface topographies that create self-cleaning and slippery features. The study demonstrates the potential of renewable oils as lubricants and their applicability in reducing adhesion in real-world scenarios.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Shu Hu, Eoin Elliott, Ana Sanchez-Iglesias, Junyang Huang, Chenyang Guo, Yidong Hou, Marlous Kamp, Eric S. A. Goerlitzer, Kalun Bedingfield, Bart de Nijs, Jialong Peng, Angela Demetriadou, Luis M. Liz-Marzan, Jeremy J. Baumberg
Summary: Bottom-up assembly of nanoparticle-on-mirror (NPoM) nanocavities enables precise inter-metal gap control down to approximate to 0.4 nm for confining light to sub-nanometer scales, thereby opening opportunities for developing innovative nanophotonic devices. However limited understanding, prediction, and optimization of light coupling and the difficulty of controlling nanoparticle facet shapes restricts the use of such building blocks.
Article
Materials Science, Multidisciplinary
Moritz Scholl, Nicolas Vogel, Steffen Lang
Summary: This article presents a novel strategy for manufacturing the main insulation of high-voltage rotating machines using electrostatic powder coating equipment. The process is fully automated, allowing for precise and reproducible application of homogeneous powder coating layers. The strategy improves powder adhesion and minimizes defect density, surpassing the state-of-the-art process in terms of partial discharge activity.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Eric S. A. Goerlitzer, Meichen Zhan, Sukyung Choi, Nicolas Vogel
Summary: Colloidal lithography is a simple and convenient method for fabricating complex nanostructures using self-assembled particle monolayers as lithographic masks. However, imperfections in the process can impair the optical quality of arrayed nanostructures. This study emphasizes the importance of detailed structure-property relationships and reveals the individual role of packing order, organic impurities, and solid polymer bridges on the optical properties of nanohole arrays.
Article
Chemistry, Multidisciplinary
Lukas J. Roemling, Gudrun Bleyer, Eric S. A. Goerlitzer, Georgy Onishchukov, Nicolas Vogel
Summary: Colloidal crystals are ideal models for studying self-assembly and structural coloration due to their periodic nature aligning with visible light wavelengths. This study compares two assembly methods for colloidal crystals and examines the influence of imperfections on structural coloration. The findings demonstrate the robustness of structural coloration in the presence of defects and irregularities.
Article
Nanoscience & Nanotechnology
Eric Sidney Aaron Goerlitzer, Mario Zapata-Herrera, Ekaterina Ponomareva, Deborah Feller, Aitzol Garcia-Etxarri, Matthias Karg, Javier Aizpurua, Nicolas Vogel
Summary: Molecular chirality is transferred to plasmonic lattice modes, providing a effective and tunable means to control chirality. Non-close packed, periodic arrays of achiral gold nanoparticles embedded in a polymer film are used to demonstrate this chirality transfer. The surface lattice resonances become optically active in the presence of chiral molecules, showing handedness-dependent excitation. Numerical simulations and a semi-analytical model rationalize this chirality transfer.
Article
Optics
Paul Beck, Laura C. Wynne, Simone Iadanza, Liam O'Faolain, Sebastian A. Schulz, Peter Banzer
Summary: In this study, a high-precision optical position sensor is presented, which is fabricated on a silicon-on-insulator platform. The sensor utilizes the principle of position-dependent directional waveguide coupling by exciting a monolithically integrated scatterer using a tightly focused polarization-tailored beam. A spatial resolution of 7.2 nm, corresponding to approximately ?/200, is demonstrated.
Article
Chemistry, Multidisciplinary
Atsushi Fujiwara, Junwei Wang, Shotaro Hiraide, Alexander Goetz, Minoru T. Miyahara, Martin Hartmann, Benjamin Apeleo Zubiri, Erdmann Spiecker, Nicolas Vogel, Satoshi Watanabe
Summary: Metal-organic frameworks (MOFs) are microporous adsorbents with unique adsorption characteristics for high-throughput gas separation. However, compacting these particles into macroscopic pellets can lead to mass-transport limitations. This study addresses this issue by forming materials with structural hierarchy using a supraparticle-based approach. The results demonstrate that pellets packed with supraparticles exhibit a significantly faster adsorption rate compared to unstructured pellets, highlighting the importance of controlling structural hierarchy for maximizing material performance.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Salvatore Chiera, Melissa Ghetina, Thomas Zimmermann, Susanne Wintzheimer, Claudia Stauch, Peer Loebmann, Karl Mandel, Nicolas Vogel
Summary: Liquid-infused surfaces with remarkable repellency properties have wide applications in maintaining clean and high-performing surfaces. The use of polydopamine (PDA) as a base layer offers the advantage of adhering to any substrate and being chemically modified. Strategies to improve the mechanical stability of these coatings have been explored, including incorporating imidazole during film formation and forming a composite with a siliceous porous coating. These strategies exhibit improved resistance to shearing and dynamic impact, and the enhanced mechanical properties are successfully transferred to liquid-infused surfaces.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Julius Marhenke, Tobias Dirnecker, Nicolas Vogel, Mathias Rommel
Summary: This study focuses on the challenges and issues encountered with PDMS material in microfluidic deterministic lateral displacement (DLD) devices, particularly the pressure-induced effects related to particle separation. The study found that PDMS deformation can be solved by thermal annealing, leading to improved separation performance in the devices. However, increased stiffness also constrains the maximum applicable throughput. The study derives an iterative model for calculating pressure distribution and deformation using measurements and numerical simulations, explaining the observed separation characteristics and throughput constraints.
MICROFLUIDICS AND NANOFLUIDICS
(2023)
Article
Chemistry, Multidisciplinary
M. Christhy V. V. Ruiz, Markus Terlinden, Matthias Engelhardt, Giulia Magnabosco, Georg Papastavrou, Nicolas Vogel, Matthias Thommes, Julien Bachmann
Summary: A geometrically tunable nanoporous system with enhanced active surface area is fabricated by stacking spheres in cylindrical pores. Straight, constricted pores are obtained through anodization of metallic aluminum. Polystyrene spheres are assembled inside the pores and serve as a filter. The system's geometry is determined by mechanical stacking rather than surface chemical interactions.
ADVANCED MATERIALS INTERFACES
(2023)
