Article
Chemistry, Physical
Tharaka Perera, Sudaraka Mallawaarachchi, Malin Premaratne
Summary: The paper introduces an ab initio model for characterizing chiral ellipsoidal metal nanoparticles, demonstrating its reduction to the general Mie-Gans model under nonchiral conditions, accurate prediction of experimental results, and wide applicability in metamaterial design.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Optics
Li Hu, Zhiguang Sun, Yingdong Nie, Yingzhou Huang, Yurui Fang
Summary: Chiral near-fields, generated or enhanced by plasmonic and photonic nanostructures, serve as a bridge between chiral molecules and light wavelengths. They have significant applications in chiral molecule detection and optical force generation.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Yiyi Liu, Tharaka Perera, Qianqian Shi, Zijun Yong, Sudaraka Mallawaarachchi, Bo Fan, Julia Ann-Therese Walker, Christopher J. Lupton, San H. Thang, Malin Premaratne, Wenlong Cheng
Summary: This study investigates the thermoresponsive chiral plasmonic responses of PNIPAM-modified gold nanorods. The modified nanorods exhibit red shifts and enhanced intensities of plasmonic circular dichroism (PCD) peaks at 50 degrees C, while the unmodified ones show no peak shifts and reduced intensities. The enhanced PCD is attributed to the collapse of PNIPAM chains, resulting in the expulsion of water molecules surrounding the chiral plasmonic nanorods and an increase in refractive index. These thermoresponsive chiral plasmonic responses are reversible, general, and applicable to other types of chiral plasmonic nanoparticles.
Article
Chemistry, Physical
Yuanhai Lin, Heng Guo, Deqing Che, Junsheng Wang
Summary: This paper presents a quasi-planar chiral metamaterial made of metal-insulator-metal (MIM) tetramer arrays that support multiple plasmon modes and achieve significant chiroptical responses. The chiroptical responses can be controlled by adjusting the insulator thickness, switching between near-field and far-field coupling regimes. Numerical calculations reveal that near-field coupling dominates at small insulator thickness, while far-field coupling becomes dominant at large spacing due to phase retardation. The tunable plasmonic chirality of the quasi-planar chiral metamaterial enables efficient light modulation for polarization conversion from circular to elliptical/linear polarization.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Antonio Carone, Pablo Mariani, Anthony Desert, Stephane Parola
Summary: Investigated the assembly of chiral plasmonic particles without using a chiral templating agent. Chiral core-shell Au@Ag and Au@Au particles were assembled in a controlled way by lowering the surfactant concentration in solution. The assembly led to pseudo-linear structures revealed by electron microscopy, and the plasmonic responses were characterized by circular dichroism (CD) and UV-Vis-NIR spectroscopies.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jinyi Dong, Yihao Zhou, Jiahao Pan, Chao Zhou, Qiangbin Wang
Summary: In this study, gold nanobipyramids (AuNBPs) were assembled into static and dynamic chiral plasmonic nanostructures using DNA origami. Compared to conventional chiral dimers of gold nanorods (AuNRs), AuNBP dimers exhibited more intriguing chiroptical responses, suggesting they could be a superior alternative for constructing chiral plasmonic nanostructures for biosensing.
CHEMICAL COMMUNICATIONS
(2021)
Article
Optics
N. Apurv Chaitanya, M. A. T. Butt, O. Reshef, Robert W. Boyd, P. Banzer, Israel De Leon
Summary: Asymmetric transmission in chiral plasmonic metasurfaces can be achieved by controlling the scattering of plasmonic nanoparticles. This effect is caused by an unbalanced excitation of lattice modes by circularly polarized light of opposite handedness. Only nonzero diffraction orders contribute to this effect.
Article
Materials Science, Multidisciplinary
Qing Tong, Shubo Wang
Summary: Researchers applied the phenomenon of helical dichroism to acoustics and found that a lattice of chiral resonators can induce differential absorption of acoustic vortices. Breaking the rotation symmetry leads to coupling between resonators, resulting in OAM band gaps and non-Hermitian exceptional points that significantly enhance helical dichroism. This discovery has important applications in acoustic OAM manipulations and chiral sound-matter interactions.
Article
Chemistry, Multidisciplinary
Zeyu Feng, Chenlu He, Yifan Xie, Chutian Zhang, Jiahe Li, Dingdong Liu, Zifan Jiang, Xin Chen, Gang Zou
Summary: Chiral metal nanostructures have recently gained attention due to their strong chiroptical properties and enhanced light-matter interactions. In this study, twisted-stacked silver nanowire arrays (TNAs) with independently controllable CD signals at interband transition and plasmonic extinction regions were constructed. These TNAs exhibited high sensitivity towards protein secondary structures, with different responses depending on the protein's beta-sheets or alpha-helices content. The mutually independent optical activities at the interband transition and plasmonic extinction regions complemented each other, providing enhanced sensitivity and reliability in chiral biosensing.
Article
Chemistry, Physical
Yuanhai Lin, Deqing Che, Heng Guo, Junsheng Wang
Summary: This research presents the use of planar plasmonic tau-shaped structure arrays to achieve significantly enhanced chiroptical responses for single-molecule detection. The chiroptical responses can be efficiently manipulated by adjusting the array parameters and structural chirality, and the arrays enable ultrasensitive detection of single-molecule proteins.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Optics
Eric B. Whiting, Lei Kang, Ronald P. Jenkins, Sawyer D. Campbell, Douglas H. Werner
Summary: By using a genetic algorithm optimization method, we have validated a chiral meta-mirror with octave bandwidth. The proposed meta-mirror can strongly absorb circularly polarized light of one handedness and highly reflect the other within the wavelength range of 1000 to 2000 nm. The study confirms the potential of advanced inverse-design approaches in creating chiral metadevices with sophisticated functionalities.
Review
Chemistry, Analytical
Nebu John, Anslin Thankachan Mariamma
Summary: Excess L-amino acid in the Murchison meteorite, circular polarization effect in the genesis of stars, and chirality in interstellar molecules contribute to the origin of life on Earth. Chiral-sensitive techniques have been employed to investigate symmetries of the universe, design effective drugs, and study chiral biomolecules. The relationship between light and chiral molecules is utilized to explore and probe such molecules using spectroscopy techniques, revealing distinct optical responses and advancing important information contents in chiroptical spectroscopy.
Article
Physics, Applied
Zhancheng Li, Yifan Jiang, Wenwei Liu, Yuebian Zhang, Hua Cheng, Junjie Li, Jianguo Tian, Shuqi Chen
Summary: We demonstrate that hybrid bilayer plasmonic metasurfaces, fabricated through a simple one-step nanofabrication process, are ideal candidates for realizing intrinsic chiral optical responses and spin-selective transmission. The proposed metasurfaces offer advantages such as compact design, easy control of chiral optical response, and lower fabrication demand, thus expanding the application potential of chiral plasmonic nanostructures in spin nanophotonics, nonlinear optics, and optical sensing.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Jiahao Pan, Xiaoyao Wang, Jinjin Zhang, Qin Zhang, Qiangbin Wang, Chao Zhou
Summary: By assembling helical plasmonic nanorods with intrinsic chirality, we have created plasmonic metamolecules with both chiral coupling and intrinsic chiroptical responses. These metamolecules offer more dimensions for tailoring chiroptical responses and make it more flexible to design plasmonic nanodevices with custom PCD.
Article
Chemistry, Multidisciplinary
Cuiping Ma, Peng Yu, Wenhao Wang, Yisong Zhu, Feng Lin, Jiaying Wang, Zhimin Jing, Xiang-Tian Kong, Peihang Li, Alexander O. Govorov, Dong Liu, Hongxing Xu, Zhiming Wang
Summary: This paper theoretically investigates the dynamics of thermally induced fluid convection of a chiral plasmonic metasurface and proposes the concept of optofluidic circular dichroism. Results show different fluid velocities of thermally induced convection around a chiral plasmonic metasurface under different circularly polarized excitation. This concept can potentially be used to induce chiral fluid convection in various optofluidics applications.
Article
Chemistry, Physical
Sadegh Ghorbani, Ali Shahrokhtash, Julien E. Gautrot, Duncan S. Sutherland
Summary: This study demonstrates that the pattern of Ln332 determines the type of cellular adhesion, with a size-dependent initiation and maturation of hemidesmosomes. The protein nanopatterning approach presented here provides a new in vitro route to study the role of hemidesmosomes in cell signaling and function.
Article
Chemistry, Multidisciplinary
Heba Khateb, Rasmus S. Sorensen, Kimberly Cramer, Alexandra S. Eklund, Jorgen Kjems, Rikke L. Meyer, Ralf Jungmann, Duncan S. Sutherland
Summary: This study investigates the interaction between Staphylococcus aureus and fibronectin, and its impact on bacterial adhesion. The results show that the adhesion of S. aureus is regulated by the size of fibronectin patches, and the engagement of at least two receptors is required for strong adhesion.
Article
Food Science & Technology
Weiwei He, Zhuqing Xie, Nina Kolln Wittig, Line F. Zachariassen, Amanda Andersen, Henrik J. Andersen, Henrik Birkedal, Dennis S. Nielsen, Axel K. Hansen, Hanne Christine Bertram
Summary: Evidence suggests that yogurt, as a source of calcium, can increase spine bone density and is associated with changes in gut microbiome and glycine-related pathways. However, adding inulin to yogurt does not affect bone mineralization in ovariectomized rats.
MOLECULAR NUTRITION & FOOD RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Tan-Phat Huynh, Yaqing Chen, Fiona L. Bach-Gansmo, Jeppe Dehli, Vicki N. Ibsen, Morten Foss, Anne S. Tvilum, Alexander N. Zelikin, Henrik Birkedal
Summary: Inspired by the mussel byssus formation process, this study proposes a simple method for underwater adhesive preparation. By injecting an acidic proto-coacervate of DOPA functionalized polyelectrolytes on underwater surfaces, coacervate adhesives can be formed without the need for pH adjustment or organic solvents. The pH of liquid-liquid phase separation can be tuned by substituting polyelectrolytes with different pK(a), satisfying different pH requirement. The coacervate-based adhesives exhibit strengths comparable to commercial glues and mussel glue, showing high biocompatibility in human epidermis in vitro.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Instruments & Instrumentation
Alexander Bernthz Jensen, Thorbjorn Erik Koppen Christensen, Clemens Weninger, Henrik Birkedal
Summary: With the increasing brilliance of X-rays generated by synchrotron facilities and the speed of detectors, it is becoming increasingly important to quickly convert collected area detector images into more workable 1D diffractograms. This study presents an integration algorithm that can integrate diffractograms in real time on modern laptops and achieve integration speeds of 10 kHz on modern workstations using a efficient pixel-splitting and parallelization scheme. The algorithm's limitations are not in the computation of the integration itself, but rather in the speed of data transfer to the processor, data decompression, and/or saving of results.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Multidisciplinary Sciences
Alexander Ahrens, Andreas Bonde, Hongwei Sun, Nina Kolln Wittig, Hans Christian D. Hammershoj, Gabriel Martins Ferreira Batista, Andreas Sommerfeldt, Simon Frolich, Henrik Birkedal, Troels Skrydstrup
Summary: Fibre-reinforced epoxy composites are widely used in load-bearing applications due to their light weight and high durability. However, the lack of viable recycling strategies for these composites has led to their disposal in landfills. This study presents a chemical recycling approach that allows for the recovery of polymer building blocks and intact fibres from epoxy composites.
Article
Chemistry, Multidisciplinary
Thorbjorn Erik Koppen Christensen, Jia Qing Isaiah Chua, Nina Kolln Wittig, Mads Ry Vogel Jorgensen, Innokenty Kantor, Jesper Skovhus Thomsen, Ali Miserez, Henrik Birkedal
Summary: This study reveals the mechanism of how stomatopods use their weaponized appendage dactyl clubs to break mollusc shells. The side of the club can be mineralized by either amorphous mineral, calcite crystallites or a mixture of both. Moreover, it was found that calcite crystallites can form as early as 1 week after the club moults. These findings provide important insights into the function and evolution of the club.
Article
Chemistry, Multidisciplinary
Tilman A. Grunewald, Andreas Johannes, Nina K. Wittig, Jonas Palle, Alexander Rack, Manfred Burghammer, Henrik Birkedal
Summary: Bone is a complex tissue consisting of collagen fibrils and biomineral nanoparticles. This study used X-ray scattering, diffraction, and computed tomography to investigate the structural properties of cement lines and lamellar bone in human bones. The results showed that the mineral properties vary near the Haversian canal and that cement lines have different mineral properties compared to the surrounding bone. These findings have implications for bone formation and mechanics.
Correction
Chemistry, Multidisciplinary
Tilman A. Grunewald, Andreas Johannes, Nina K. Wittig, Jonas Palle, Alexander Rack, Manfred Burghammer, Henrik Birkedal
Article
Chemistry, Multidisciplinary
Maja Ostergaard, Estrid Buhl Naver, Anders Kaestner, Peter K. Willendrup, Annemarie Bruel, Henning Osholm Sorensen, Jesper Skovhus Thomsen, Soren Schmidt, Henning Friis Poulsen, Luise Theil Kuhn, Henrik Birkedal
Summary: This study demonstrates the use of a phase-retrieval technique for propagation-based phase-contrast neutron imaging with a polychromatic beam. This technique allows imaging of samples with low absorption contrast and/or improving the signal-to-noise ratio for time-resolved measurements. Metal and bone samples were used to demonstrate the technique, showing significant improvement in signal-to-noise ratios and the ability to separate bone and D2O in the bone sample for in situ flow experiments. The use of deuteration contrast makes neutron imaging an interesting complementary method to X-ray imaging of bone, without the need for chemical contrast enhancement.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Engineering, Biomedical
Jia Qing Isaiah Chua, Thorbjorn Erik Koppen Christensen, Jonas Palle, Nina Kolln Wittig, Tilman A. Grunewald, Jan Garrevoet, Kathryn M. Spiers, Hiram Castillo-Michel, Andreas Schramm, Wang Loo Chien, Radoslaw M. Sobota, Henrik Birkedal, Ali Miserez
Summary: The stomatopod Odontodactylus scyllarus uses weaponized club-like appendages to attack its prey. These clubs are made of apatite, chitin, amorphous calcium carbonate, and amorphous calcium phosphate organized in a highly hierarchical structure with multiple regions and layers. This study investigates the biomineralization history of the clubs and reveals the spatio-temporal changes in biomineral structure during club formation. The results show that the club structure is more organized than previously thought, with variations in crystal orientation and a thin membrane rich in bromine coating the impact surface.
ACTA BIOMATERIALIA
(2023)
Review
Chemistry, Multidisciplinary
Adrian Rodriguez-Palomo, Maja Ostergaard, Henrik Birkedal
Summary: Bone has a complex hierarchical structure that is currently being better understood through advanced characterization methods. The heterogeneity and uniformity of bone may play significant roles in bone biology.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Energy & Fuels
Anisha Chirumamilla, Fei Ding, Yuanqing Yang, Murugan Senthil Mani Rajan, Sergey I. Bozhevolnyi, Duncan S. Sutherland, Kjeld Pedersen, Manohar Chirumamilla
Summary: In this study, a simple large-area nanofabrication method was proposed to create tungsten nanodisc spectrally-selective emitters with high emissivity and thermal stability. The method showed invariance to changes in polarization and incidence angles. This research is significant in advancing the implementation of photonic/plasmonic thermal emitters in high-temperature stable and efficient thermal energy harvesting systems.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Optics
Anisha Chirumamilla, Maria H. Salazar, Deyong Wang, Peter K. Kristensen, Duncan S. Sutherland, Manohar Chirumamilla, Vladimir N. Popok, Kjeld Pedersen
Summary: Various nanostructures capable of generating strong local electromagnetic fields have been extensively studied for plasmonic applications. In this research, pin-shaped gold nanodiscs were fabricated on silicon posts to decouple the optical near fields from the substrate. The optimal diameter of the silicon post was achieved through reactive-ion etching, resulting in a 3-fold increase in the electric field enhancement compared to similar structures on bulk silicon. The pin-shaped nanostructures showed a significant increase in the enhancement factor in SERS measurements. This work suggests a method of engineering 3D morphology to tune the substrate influence on plasmonic properties and develop efficient nanofabrication technologies.
Article
Chemistry, Multidisciplinary
Yaqing Chen, Erik Misselwitz, Asger Holm Agergaard, Amanda Andersen, Carsten Pedersen, Henrik Birkedal
Summary: This study designed self-forming double-crosslinked (DC) hydrogels by incorporating enzyme-mimicking metal coordination polymer crosslinks and catechol chemistry. A macromolecular tris-histidine copper complex acted as both part of the hydrogel network and a catalyst for catechol oxidation, inducing a second hydrogel network by covalent crosslinking of catechol functionalized polymers and providing catalytic control over hydrogel crosslinking.
CHEMICAL COMMUNICATIONS
(2022)
