Article
Optics
Mahsa Barkabian, Nahid Sharifi, Nosrat Granpayeh
Summary: An ultra-thin reflective metasurface is proposed for polarization conversion in the terahertz band, utilizing graphene ribbons on a silicon substrate. By changing the chemical potential of graphene, the structure functions as linear and circular polarization converters. Simulation results show high efficiency and potential applications in imaging, sensing, communication, and optical technologies.
Article
Chemistry, Physical
Marta Duchi, Saurabh Shukla, Andrey Shalit, Peter Hamm
Summary: Researchers propose a 2D-Raman-terahertz (THz) setup with multichannel THz detection using two crossed echelons to reduce the acquisition time of typical 2D-Raman-THz experiments from days to hours. This setup utilizes a high repetition rate Yb-based femtosecond laser system and fast array detector for acceleration. Compared to conventional step-scanning measurements, there is a 5.8-fold increase in signal-to-noise ratio for single-shot detection, leading to a 34-fold speed-up in acquisition time.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Matteo Stocchi, Zhibo Cao, Christopher Hardly Joseph, Thomas Voss, Davide Mencarelli, Luca Pierantoni, Canan Baristiran Kaynak, Joachim Hebeler, Thomas Zwick, Matthias Wietstruck, Mehmet Kaynak
Summary: This paper presents a MM-loaded sub-THz on-chip antenna with a narrow beamwidth, 9 dB gain, and a simulated peak efficiency of 76% at 300 GHz. The antenna is surrounded by a single MM-cell ring to suppress surface waves. Comparisons between the measured and simulated performances show excellent agreement, indicating that the MM-loaded antenna is a viable alternative for next-generation sub-THz transceivers.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Sambit Kumar Ghosh, Santanu Das, Somak Bhattacharyya
Summary: This paper introduces a graphene-metal dual functional metadevice that can simultaneously provide absorption and cross-polarization conversion of electromagnetic waves in the terahertz (THz) range. The device shows high performance with over 70% absorptivity and a CPC ratio above 90% over specific bandwidths. It features ultrathin and compact properties, making it suitable for various applications in THz sensing, stealth technology, communication, detection, and polarization manipulation of EM waves.
Article
Chemistry, Analytical
Shulei Zhuang, Xinyu Li, Tong Yang, Lu Sun, Olga Kosareva, Cheng Gong, Weiwei Liu
Summary: The paper presents a tunable metamaterial based on graphene that exhibits absorption and transmission functionality. The absorption and transmission characteristics can be controlled by modifying the chemical potential of graphene. The metamaterial shows adjustable absorption in the frequency range of 0.72 THz to 1.26 THz, and adjustable transmission at 2.35 THz. The use of UV glue and PET as dielectric and substrate materials respectively make the metamaterial flexible and insensitive to incident and polarization angles.
Article
Optics
Jiaming Dong, Xin-hua Deng, Pingsheng Zhang, Jiren Yuan
Summary: In this paper, a graphene-based multi-channel THz perfect absorber is proposed. The absorber consists of a graphene layer, a Fibonacci quasi-periodic layer, a spacer, and a substrate. The structure utilizes graphene surface plasmon polaritons and multiple photonic stop bands to achieve multi-channel perfect THz absorption. The working frequencies and absorption peaks can be flexibly tuned, and the number of working channels can be expanded without reoptimizing the structure size by adjusting the Fibonacci quasi-period orders.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Yandong Peng, Wenpeng Zhou, Lidan Lin, Bing Chen, Yangjian Cai, Anhui Liang, Yuxia Li
Summary: A double-band THz white light cavity scheme based on enhanced nonlinear dispersion in a graphene system is proposed, leading to double anomalous dispersion regions and broadened cavity linewidth. The simulation results show that the nonlinear WLC has much larger linewidths than the empty cavity, and a multi-band THz WLC can be obtained in doped graphene with additional optical field assistance. This scheme may have potential applications in multi-band THz communications.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Optics
Yutian Xie, Jiaqi Quan, Qiangshi Shi, Yanyan Cao, Baoyin Sun, Yadong Xu
Summary: Inspired by phase-gradient metasurfaces, a multi-functional light beam splitter (LBS) operating in the optical regime is designed by manipulating anomalous diffraction properties. The designed LBS demonstrates high-efficiency light beam splitting on both energy and polarization, as well as broadband and wide-angle response. The role of Ohmic loss of metals in determining diffraction efficiency is also investigated.
Article
Optics
Joel Lamberg, Faezeh Zarrinkhat, Aleksi Tamminen, Mariangela Baggio, Juha Ala-Laurinaho, Juan Rius, Jordi Romeu, Elsayed E. M. Khaled, Zachary Taylor
Summary: Wavefront-modified vector beams improve the accuracy and focusing of cornea spectroscopy, while wavefront-modified cylindrical vector beams are not suitable for this application but have potential in optical force applications.
Article
Optics
Ziru Cai, Yingtao Ding, Zhiming Chen, Ziwei Zheng, Fei Ding
Summary: Optical metasurfaces have the potential to revolutionize wave plates with their compact size and diverse functionalities. However, most metasurface wave plates are passive and lack dynamic capabilities. In this study, we propose a dynamic dual-functional meta-wave plate based on Sb2Se3 meta-molecules, which enables reconfigurable polarization conversion. Comprehensive simulations are performed to verify the phase change process. This design opens up new possibilities for integrated adaptive photonics with dynamic and multiplexed functionalities.
Article
Optics
Hussein A. Elsayed, Arvind Sharma, Francis Segovia-Chaves, Walied Sabra
Summary: This study proposes a heterostructure composed of regular and quasi-periodic photonic crystal designs for multi passband filter applications in the THz region. Numerical simulations demonstrate resonant peaks in the transmittance spectrum of the proposed design, which can be tuned by adjusting design parameters. The tunability of the resonant peaks makes the proposed filter act as a multi passband filter by controlling the design parameters at the THz region.
Article
Engineering, Electrical & Electronic
Madan Kumar Sharma, Ankit Sharma
Summary: This study aims to develop a novel and compact multi-port antenna that can operate in multiple frequency bands (5G high bands and sub-THz band). The antenna structure is extended from two ports to four and eight ports while preserving MIMO performance and multi-band operating behavior, resulting in improved MIMO performance.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
Fenghao Yin, Yanlin Lv, Dongyan Xu, Xing Ri Jin, Ying Qiao Zhang
Summary: We propose a terahertz chiral metamaterial that can manipulate the transmission of linear polarized waves, converting them to elliptical polarization and generating circular dichroism in transmission mode, while showcasing asymmetry reflection of circular polarized waves. The device achieves dual-band asymmetry transmission at 0.42 THz and 1.04 THz, with transmission factors reaching peak values of -0.51 and -0.55, respectively. Additionally, it enables intense linear-to-elliptical polarization conversion at 0.81 THz and 0.97 THz. When circular polarized waves are incident, it exhibits strong circular dichroism at 0.36 THz and asymmetry reflection with maximum asymmetry reflection factors approaching 0.55.
Article
Nanoscience & Nanotechnology
Hidetoshi Somekawa, Norie Motohashi, Shuji Kuroda, Toshihiko Mandai
Summary: Wide and thin Mg foils with thicknesses between 35 & mu;m and 400 & mu;m without any edge cracks are successfully produced. The initial microstructure in the billet is effective and essential for the processing. The mechanical properties of the foils are influenced by the foil thickness, as shown by hardness and tensile tests.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Fahad Ahmed, Tania Tamoor, Tayyab Hassan, Nosherwan Shoaib, Akram Alomainy, Qammer H. Abbasi
Summary: This paper presents a multi-functional bi-anisotropic metasurface with ultra-wide out of band transmission characteristics, achieving over 50% out-of-band transmission from L- to X-band and up to 99% at lower frequency bands. It also demonstrates absorptive and controlled reflection functionalities in a specific frequency range, along with polarization-insensitive and angular stable properties.
SCIENTIFIC REPORTS
(2021)
Article
Medicine, Legal
P. Chytry, G. M. S. Souza, R. Debastiani, C. E. I. dos Santos, J. M. R. Antoine, A. Banas, K. Banas, L. Calcagnile, M. Chiari, I. Hajdas, M. Molnar, P. Pelicon, N. Pessoa Barradas, G. Quarta, F. S. Romolo, A. Simon, J. F. Dias
Summary: This article discusses the synergistic use of different accelerator-based techniques as a powerful analytical tool for forensic studies of foodstuff. Brazilian and Jamaican coffees were chosen as samples for comprehensive characterization, including major and trace elements, provenance determination, and compound contents, using techniques such as PIXE, FTIR, and AMS-C-14. Five laboratories from research institutions around the world participated in the experiments. The integration of results from different techniques provided multifaceted perspectives on the coffee under study, enabling direct assessment for forensic purposes such as authentication, determining provenance, and combating counterfeiting.
FORENSIC SCIENCE INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
C. Sathish, Gopalakrishnan Kothandam, Premkumar Selvarajan, Zhihao Lei, Jangmee Lee, Jiangtao Qu, Ala'a H. Al-Muhtaseb, Xiaojiang Yu, Mark B. H. Breese, Rongkun Zheng, Jiabao Yi, Ajayan Vinu
Summary: In this study, well-defined mesoporous boron carbon nitride (MBCN) with high specific surface area, tunable pores, and nitrogen contents was successfully prepared through chemical polymerization and nano-hard-templating approach. The optimized sample exhibited high specific capacitance, large specific capacity for sodium-ion battery, and excellent CO2 adsorption capacity.
Article
Nanoscience & Nanotechnology
Harpreet Singh Gujral, Mohammed Fawaz, Stalin Joseph, C. Sathish, Gurwinder Singh, Xiaojiang Yu, Mark B. H. Breese, Jiabao Yi, Mandeep Singh, Vipul Bansal, Ajay Karakoti, Ajayan Vinu
Summary: This study reports a method for preparing nanoporous titanium carbonitride using a high-nitrogen-containing mesoporous carbon nitride as a template. The prepared samples show high nanoporosity and exhibit high electrocatalytic activity in acidic medium, similar to commercially available platinum catalysts.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Harpreet Singh Gujral, Gurwinder Singh, Jae Hun Yang, C. I. Sathish, Jiabao Yi, Ajay Karakoti, Mohammed Fawaz, Kavitha Ramadass, Ala'a H. Al-Muhtaseb, Xiaojiang Yu, Mark B. H. Breese, Ajayan Vinu
Summary: Transition metal nitrides have attracted much attention due to their unique structure and electrical properties, and they have great potential for electrocatalytic applications. This study successfully synthesized highly crystalline and mesoporous titanium carbonitride (MTiCN) materials using a combination of reactive templating approach and doping. The optimized MTiCN material exhibited considerable electrocatalytic hydrogen evolution reaction (HER) activity, which is close to the performance of commercial platinum/carbon catalysts. This work provides a simple solution for the rational design of porous transition metal carbon nitrides with excellent electrocatalytic properties.
Article
Medicine, Legal
Thomas Calligaro, Agnieszka Banas, Krzysztof Banas, Iva Bogdanovic Radovic, Marko Brajkovic, Massimo Chiari, Anne-Maija Forss, Irka Hajdas, Matea Krmpotic, Anna Mazzinghi, Eva Menart, Kenichiro Mizohata, Markku Oinonen, Laurent Pichon, Jyrki Raisanen, Zdravko Siketi, Ziga Smit, Aliz Simon
Summary: This paper outlines the results of using nuclear analytical techniques to detect forged works of art. By employing various analysis techniques, the materials of the paintings were examined, and a combination of these techniques enabled the accurate determination of the authenticity and history of the paintings.
FORENSIC SCIENCE INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
B. L. Ong, K. Jayaraman, C. Diao, T. J. Whitcher, A. Jain, H. Hung, M. B. H. Breese, E. S. Tok, A. Rusydi
Summary: Researchers report strong ferromagnetism of quasiparticle doped holes within the ab-plane and along the c-axis of Cu-O planes in low-dimensional Au/d-La1.8Ba0.2CuO4/LaAlO3(001) heterostructures. The ferromagnetism is stronger at a hole doped peak and at an upper Hubbard band of O with a spin-polarization degree of up to 40%, indicating strong ferromagnetism of Mottness.
NATURE COMMUNICATIONS
(2022)
Article
Instruments & Instrumentation
X. J. Yu, X. Chi, T. Smulders, A. T. S. Wee, A. Rusydi, M. Sanchez del Rio, M. B. H. Breese
Summary: This article introduces the use of crystals and gratings in monochromators for synchrotron radiation beamlines, as well as the limitations of common perfect crystals and gratings in the intermediate range. It also presents a method to evaluate crystal performance using tools like ray-tracing and an upgrade for simulating high d-spacing crystals.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Chemistry, Physical
Haidong Liang, Yue Zheng, Leyi Loh, Zehua Hu, Qijie Liang, Cheng Han, Michel Bosman, Wei Chen, Andrew A. Bettiol
Summary: In this study, efficient n-type doping of 2D TMDs was achieved through ion beam irradiation, and the doping effect remained stable even after one year of exposure to ambient conditions. Furthermore, high-performance homogenous p-n junction diodes were fabricated using localized ion irradiation.
Article
Physics, Applied
Chi Sin Tang, Shengwei Zeng, Caozheng Diao, Jing Wu, Shunfeng Chen, Mark B. H. Breese, Chuanbing Cai, Thirumalai Venkatesan, Ariando Ariando, Andrew T. S. Wee, Xinmao Yin
Summary: The effects of atomic-scale disorder and charge (de)localization are of great importance in condensed matter systems and provide insights into the role of strong and weak correlations. In this study, researchers found that 2D free electrons were localized in the specific hybridized states at the LaAlO3/SrTiO3 interface. The localization of 2D electrons could be induced through temperature reduction or ionic liquid gating. Interfacial hybridization was found to play a crucial role in regulating the localization effects. This study not only highlights the importance of interfacial hybridization but also offers a new approach for device fabrication in amorphous film systems.
APPLIED PHYSICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Shulun Han, Chi Sin Tang, Linyang Li, Yi Liu, Huimin Liu, Jian Gou, Jing Wu, Difan Zhou, Ping Yang, Caozheng Diao, Jiacheng Ji, Jinke Bao, Lingfeng Zhang, Mingwen Zhao, Milorad V. Milosevic, Yanqun Guo, Lijun Tian, Mark B. H. Breese, Guanghan Cao, Chuanbing Cai, Andrew T. S. Wee, Xinmao Yin
Summary: The recently discovered kagome topological superconductor AV(3)Sb(5) (A = K, Rb, Cs) has a unique structural motif that can host diverse topologically non-trivial phenomena. It remains unclear how atomic-level properties and many-body effects contribute to these symmetry-breaking phenomena. In this study, the role of V3d-Sb5p orbital hybridization in mediating the CDW phase transition in CsV3Sb5 is reported. The results highlight the critical role of Sb orbitals and establish orbital hybridization as the direct mediator of the CDW states and structural transition dynamics in kagome unconventional superconductors.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Chengyuan Yang, Zhaohong Mi, Huining Jin, Thirumalai Venkatesan, Ratnakar Vispute, Andrew A. Bettiol
Summary: We report a method for large-scale fabrication of negatively charged Silicon-vacancy (SiV-) centers in diamond membranes using MeV Helium ion implantation. Despite the polycrystalline structure of the diamond membranes, the SiV- centers exhibit a fluorescence lifetime comparable to those fabricated in single crystal diamonds. Patterning of SiV- centers with varying densities is demonstrated using a focused ion beam.
Article
Biochemistry & Molecular Biology
Agnieszka M. Banas, Krzysztof Banas, Mark B. H. Breese
Summary: In this study, the use of Fourier Transform Infrared (FTIR) spectroscopy and statistical multivariate analysis techniques successfully identified high explosive (HE) materials (C-4, TNT, and PETN) in residues after high- and low-order explosions. The data pre-treatment process and the application of various machine learning classification techniques, including the hybrid LDA-PCA method implemented using the R environment, are also described.
Article
Chemistry, Multidisciplinary
Yuan Chen, Haidong Liang, Leyi Loh, Yiwei Ho, Ivan Verzhbitskiy, Kenji Watanabe, Takashi Taniguchi, Michel Bosman, Andrew A. Bettiol, Goki Eda
Summary: We observe bound exciton (BX) complex manifolds in monolayer MoSe2 with intentionally created monoselenium vacancies (VSe) using proton beam irradiation. The emission intensity of different BX peaks exhibits contrasting dependence on electrostatic doping near the onset of free electron injection. These complexes, which are more strongly bound than trions and biexcitons, survive up to around 180 K and show moderate valley polarization memory, indicating partial free exciton character.
Article
Chemistry, Multidisciplinary
Yu Cao, Haidong Liang, Hong-Lin Lin, Luo Qi, Ping Yang, Xuanyao Fong, Elhadj Dogheche, Andrew Bettiol, Aaron Danner
Summary: Barium titanate-on-insulator has demonstrated excellent optical properties for waveguide-based devices. Traditional dry etching methods have limitations in achieving the required refractive index contrast. This study introduces three etch-free methods, including metal diffusion, proton beam irradiation, and crystallinity control, to create the desired index contrast in barium titanate-on-insulator.
Article
Chemistry, Multidisciplinary
Feifei Zhou, Zhengzhi Jiang, Haidong Liang, Shihao Ru, Andrew A. Bettiol, Weibo Gao
Summary: We systematically investigate the laser and microwave power broadening in continuous-wave optically detected magnetic resonance (ODMR) of the V-(B) over bar ensemble in h-BN. The behaviors of ODMR contrast and line width are revealed as a function of the laser and microwave powers. The results provide important suggestions for further applications of V-(B) over bar centers in quantum information processing and ODMR-based quantum sensing.
