Article
Chemistry, Multidisciplinary
Stephen A. Lee, Christopher T. Kuhs, Emily K. Searles, Henry O. Everitt, Christy F. Landes, Stephan Link
Summary: In this study, time-resolved emission upconversion microscopy was used to investigate the lifetime and energy-dependent cooling of d-band holes formed in gold nanoparticles by plasmon excitation and decay.
Article
Chemistry, Multidisciplinary
Gyeong-Su Park, Kyung Suk Min, Hyuksang Kwon, Sangwoon Yoon, Sangwon Park, Ji-Hwan Kwon, Sangmin Lee, Jaeyeon Jo, Miyoung Kim, Seong Keun Kim
Summary: Research using high spatial- and spectral-resolution mapping of LSPR modes and nanoscale strain mapping investigates the distribution of LSPR modes and the effect of defect-induced strains on properties.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Mario Gutierrez, Zichao Lian, Boiko Cohen, Masanori Sakamoto, Abderrazzak Douhal
Summary: Localized surface plasmon resonance (LSPR)-induced hot-carrier transfer is an attractive option for efficient energy conversion, particularly in the infrared (IR) range. By using femtosecond transient absorption measurements, the researchers observed the dynamics of LSPR-driven hot holes in CuS nanocrystals (NCs) and CuS/CdS hetero nanocrystals (HNCs). In CuS NCs, hot holes relax through multiple pathways, populating two trap states before decaying. In CuS/CdS HNCs, the hot holes are transferred to the CdS phase through plasmon-induced transit hole transfer (PITCT) and relax in a longer timescale. This study provides important insights into controlling LSPR-induced relaxation in semiconductors.
Article
Physics, Particles & Fields
E. Rubin de Celis, C. Simeone
Summary: This paper revisits the possibility of improving the restrictive conditions for safe travel through wormhole throats by considering the relation between traversability and tides in thin-shell wormholes. The study focuses on wormholes mathematically constructed from background geometries that are solutions of scalar-tensor theories. The advantages of working within such frameworks are examined by analyzing the dependence of extrinsic curvature and tides on the parameters determining the departure from pure relativity, as well as the behavior of tides in the smooth regions of the geometries. Other related approaches within pure relativity are also discussed in the appendices.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Applied
Thomas Simon, Sergei Kostcheev, Anna Rumyantseva, Jeremie Beal, Davy Gerard, Jerome Martin
Summary: Metallic nanostructures acting as optical nanoantennas can significantly enhance the photoluminescence of nearby emitters. The proposed solid-state ultraviolet emitter based on a thin film of zinc oxide coupled with an array of aluminum nanoparticles demonstrates enhanced near band-edge emission compared to bare zinc oxide. Surface lattice resonances are shown to be more efficient for luminescence enhancement in zinc oxide compared to localized surface plasmon resonances.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
S. V. Perminov, D. A. Shapiro
Summary: Discrete Dipole Approximation (DDA) is an effective method for light scattering calculation. This paper extends it to solve a 2-dimensional problem in two different semi-spaces and considers the influence of boundary conditions on electromagnetic fields. Through numerical calculations and comparisons, the correlation between the scattering angle function and previous results, as well as the red shift phenomenon of the plasmon resonance, are demonstrated.
Article
Physics, Multidisciplinary
Nilofar Rahman, Mehedi Kalam, Amit Das, Sayeedul Islam, Farook Rahaman, Masum Murshid
Summary: Einstein-Gauss-Bonnet gravity is a generalization of general relativity to higher dimensions. By using the "Cut-Paste" technique from black holes in Einstein-Gauss-Bonnet gravity and inspired by non-commutative geometry, a new class of 5D thin-shell wormholes has been constructed, with a static spherically symmetric, Gaussian mass distribution as the source. The study explores the pressure-density profile, equation of state, nature of the wormhole, and the total amount of exotic matter content at the shell, as well as analyzes the linearized stability of the constructed wormhole. The findings suggest that the model is plausible compared to other thin-shell wormhole models in literature.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Chemistry, Multidisciplinary
Hemant Jatav, Masoud Shabaninezhad, Maja Micetic, Anusmita Chakravorty, Ambuj Mishra, Matthias Schwartzkopf, Andrei Chumakov, Stephan V. Roth, Debdulal Kabiraj
Summary: In this study, Ag NPs embedded in a silica matrix were synthesized using atom beam co-sputtering technique. A novel procedure was used to estimate the size of NPs, and it was found that the embedded Ag NPs remained stable in size below 800 degrees Celsius.
Article
Chemistry, Multidisciplinary
Yuanfang Yu, Lei Gao, Xianghong Niu, Kaiyang Liu, Ruizhi Li, Dandan Yang, Haibo Zeng, Hui-Qiong Wang, Zhenhua Ni, Junpeng Lu
Summary: This study discovered the competitive interfacial transfer mechanisms of detrapped holes and hot electrons in hot-carrier devices. Through photocurrent polarity research and optical-pump-THz-probe spectroscopy, it was confirmed that detrapped hole transfer (DHT) and hot-electron transfer (HET) dominate different excitation responses. The photocurrent ratio assigned to DHT and HET significantly increases as the illumination intensity decreases. DHT leads to a severe degeneration of the external quantum efficiency (EQE), especially at low illumination intensities. Removal of DHT can theoretically increase the EQE of a hot-electron device by over two orders of magnitude at 10 mW cm(-2). The competitive transfer arises from carrier oscillation type and carrier-density-related Coulomb screening.
ADVANCED MATERIALS
(2023)
Article
Astronomy & Astrophysics
Francesco Bollati, Alessandro Lupi, Massimo Dotti, Francesco Haardt
Summary: The presence of a large population of cosmic massive black hole (MBH) binaries, which are the loudest sources of gravitational waves, is implied by the ubiquity of massive black holes at the center of galaxies and the hierarchical progress of structure formation. Studies show that the feedback exerted by the MBHs on the surrounding gaseous environment critically affects the formation rate of MBH binaries. Simulations reveal that feedback slows down the inspiral of the secondary MBH and causes it to orbit on eccentric orbits.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Swathi Swaminathan, Jitendra K. K. Bera, Manabendra Chandra
Summary: By using visible photoexcitation of gold nanospheres, we have successfully collected multiple plasmon-induced "hot holes" to completely oxidatively cleave the C=C bond in styrene at room temperature, selectively forming benzaldehyde and formaldehyde, which is a reaction requiring activation of multiple substrates. Our findings indicate that efficient extraction of hot holes occurs with interband excitation, while harvesting of multiple hot holes from excited Au nanospheres becomes predominant only beyond a threshold light intensity. We demonstrate that alkene oxidation proceeds through a sequence of two consecutive elementary steps, namely a binding step and a cyclic oxometallate transition state as the rate-determining step. This plasmon excitation-mediated harvesting of multiple hot holes without the need for an extra hole transport media opens up exciting possibilities for difficult catalytic transformations involving multielectron oxidation processes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Optics
Yoshiaki Nishijima, Naoki To, Armandas Balcytis, Saulius Juodkazis
Summary: This study conducted a detailed spectral analysis of the radiation absorption and scattering behaviors of metasurfaces through photonic simulations. It was found that the absorbance and scattering cross-sections exhibit a ratio of 1 at the absorption peak spectral position. By increasing the absorption through optical materials, the total absorption efficiency can be controlled, leading to near-perfect absorption and emission of thermal radiation.
Article
Astronomy & Astrophysics
Guo-Ping Li, Ke-Jian He
Summary: In this paper, the shadows and rings of the KS black hole in deformed HL gravity were carefully investigated using the ray-tracing method. The results show a decrease in certain parameters and an increase in effective potential with an increase in the omega parameter, with direct emissions dominating the total observed intensity.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Chemistry, Physical
Fangjuan Geng, Yu-Ning Wu, Daniel Splith, Liangjun Wang, Xiaowan Kang, Xiaojian Chen, Pengsheng Guo, Shanshan Liang, Lei Yang, Michael Lorenz, Marius Grundmann, Jiaqi Zhu, Chang Yang
Summary: By developing an amorphous Cu(S,I) material system, record high hole conductivities of 10(3)-10(4) S cm(-1) have been achieved in p-type amorphous transparent conductors (a-TCs), making them comparable with commercial n-type TCs made of indium tin oxide and 100 times greater than any previously reported p-type a-TCs. The high hole conduction is due to the overlap of large p-orbitals of I- and S2- anions, providing a hole transport pathway insensitive to structural disorder. Additionally, the bandgap of amorphous Cu(S,I) can be modulated from 2.6 to 2.9 eV by increasing the iodine content. These unique properties demonstrate the great potential of the Cu(S,I) system as a promising p-type amorphous transparent electrode material for optoelectronics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Zhiyong Zheng, Ping Yu, Huili Cao, Mengyu Cheng, Thomas Zhou, Li E. Lee, Jens Ulstrup, Jingdong Zhang, Christian Engelbrekt, Lixin Ma
Summary: This study introduces a highly efficient ultrathin CuS nanocrystal coated with starch for enhanced photothermal therapy, utilizing a localized surface plasmon resonance at 980 nm wavelength. This novel nanomaterial demonstrates significant cancer cell killing capabilities.
Article
Chemistry, Analytical
Lars Juhlin, Therese Mikaelsson, Aron Hakonen, Michael Stenbaek Schmidt, Tomas Rindzevicius, Anja Boisen, Mikael Kall, Per Ola Andersson
Article
Nanoscience & Nanotechnology
Daniel Andren, Jade Martinez-Llinas, Philippe Tassin, Mikael Kall, Ruggero Verre
Article
Optics
Thomas D. Green, Denis G. Baranov, Battulga Munkhbat, Ruggero Verre, Timur Shegai, Mikael Kall
Article
Chemistry, Multidisciplinary
Pawel Karpinski, Steven Jones, Hana Sipova-Jungova, Ruggero Verre, Mikael Kall
Article
Nanoscience & Nanotechnology
Nils Odebo Lank, Peter Johansson, Mikael Kall
Article
Nanoscience & Nanotechnology
Samira Khadir, Daniel Andren, Ruggero Verre, Qinghua Song, Serge Monneret, Patrice Genevet, Mikael Kall, Guillaume Baffou
Summary: An optical metasurface is composed of scattering nanostructures and can be used to design ultrathin lenses, beam deflectors, and holograms. Improving metasurface design involves developing postcharacterization techniques, with quadriwave lateral shearing interferometry being a versatile method for achieving full optical characterization of metasurfaces.
Article
Chemistry, Multidisciplinary
Barbora Spackova, Hana Sipova-Jungova, Mikael Kall, Joachim Fritzsche, Christoph Langhammer
Summary: Research shows that applying nanofluidics to plasmonic nanoparticles can achieve efficient single-molecule detection in ultra-small sample volumes, which conventional microfluidic devices cannot accomplish. By downsizing fluidic structures, both detection times and the number of detected binding events can be significantly improved.
Article
Multidisciplinary Sciences
Falko Schmidt, Hana Sipova-Jungova, Mikael Kaell, Alois Wuerger, Giovanni Volpe
Summary: Active nanoparticles in a critical solution show behavior far from equilibrium, with fast orbital rotations observed around the beam axis even with an increase in effective temperature.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Daniel Andren, Denis G. Baranov, Steven Jones, Giovanni Volpe, Ruggero Verre, Mikael Kall
Summary: Utilizing optomechanical effects, optical metavehicles can be constructed for microscopic particles to travel long distances under low-intensity plane-wave illumination and be steered by the polarization of the incident light. Demonstrating movement in complex patterns, self-correcting motion, and application as transport vehicles for microscopic cargoes, including unicellular organisms. The abundance of possible optical metasurfaces suggests the potential for developing a wide variety of metavehicles with specialized functional behaviors.
NATURE NANOTECHNOLOGY
(2021)
Article
Optics
Rajath Sawant, Daniel Andren, Renato Juliano Martins, Samira Khadir, Ruggero Verre, Mikael Kall, Patrice Genevet
Summary: The study focuses on correcting various aberrations in optical systems using hybrid metalenses. Results show that at centimeter-scale hybrid metalenses, chromatic aberration and spherical aberration can be corrected by at least 80% and 70% respectively. The flexibility of adjusting various optical parameters with hybrid metasurfaces opens up new design opportunities for compact and broadband imaging, augmented reality/virtual reality, and holographic projection.
Article
Physics, Multidisciplinary
Falko Schmidt, Agnese Callegari, Abdallah Daddi-Moussa-Ider, Battulga Munkhbat, Ruggero Verre, Timur Shegai, Mikael Kaell, Hartmut Loewen, Andrea Gambassi, Giovanni Volpe
Summary: Researchers have demonstrated the tunable repulsive critical Casimir forces, which are important for the development of micro- and nanodevices. The stiction between parts in micro- and nanodevices, caused by attractive Casimir-Lifshitz forces, has been successfully counteracted by the repulsive critical Casimir forces. This breakthrough provides active control and precise tunability in the forces acting between the constituent parts.
Article
Optics
Mohammad Mahdi Shanei, Einstom Engay, Mikael Kaell
Summary: Researchers have proposed an ultra-thin silicon-based metasurface technology that enables simultaneous confinement and propulsion of microparticles, allowing for the trapping and transport of microscopic particles in a thin liquid cell. This technology is expected to play a significant role in areas such as miniaturized optical sensing, driving, and sorting.
Article
Optics
Mindaugas Juodenas, Erik Strandberg, Alexander Grabowski, Johan Gustavsson, Hana Sipova-Jungova, Anders Larsson, Mikael Kall
Summary: Flat metaoptics components have the potential to replace classical optics elements, leading to compact biophotonics devices when integrated with on-chip light sources and detectors. However, shaping light into wide angular range wavefronts with high efficiency using metasurfaces, as required in high-contrast microscopy applications, remains a challenge.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Review
Nanoscience & Nanotechnology
Daniel Midtvedt, Vasilii Mylnikov, Alexander Stilgoe, Mikael Kall, Halina Rubinsztein-Dunlop, Giovanni Volpe
Summary: The deep-learning revolution is providing new opportunities for manipulating and harnessing light. It has already shown success in improving the design of nanophotonic devices and analyzing experimental data. However, challenges arise in understanding and interpreting the results and reliability of deep learning.
