Article
Spectroscopy
Ondrej Petrus, Jan Macko, Renata Orinakova, Andrej Orinak, Erika Mudra, Miriam Kupkova, Zdenek Farka, Matej Pastucha, Vladimir Socha
Summary: This study presents the development of a NiAg nanocavity film for the SERS-based detection of organic dyes, demonstrating its potential for detecting ultra-low concentrations of samples. Experimental results confirm the superior performance of the NiAg nanocavity film in SERS detection of organic dyes.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Optics
Chenglong Wang, Xiang Guo, Xidong Wu
Summary: This paper proposes and investigates a graphene plasmonic lens with an electrically tunable focal length. By controlling the gate voltage of graphene, the lens can be continuously tuned from a Maxwell Fisheye lens to a Luneburg lens, and excellent focusing performances are achieved.
Article
Spectroscopy
Qianqian Wang, Juan Wang, Man Li, Zipan Ge, Xiang Zhang, Longlong Luan, Pan Li, Weiping Xu
Summary: A novel SERS method utilizing plasmonic core-shell AuNS@AgNCs as substrates has been developed for rapid and sensitive detection of BBP in liquor samples. The optimized AuNS@AgNCs showed a detection limit of 10(-9) M for BBP. Additionally, FDTD electromagnetic simulations were in good agreement with experimental results.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Materials Science, Multidisciplinary
Shimon Elkabetz, K. Nireekshan Reddy, Parry Y. Chen, Antonio Fernandez-Dominguez, Yonatan Sivan
Summary: Utilizing transformation optics, we significantly improved the efficiency of second-harmonic generation from metallic wires and increased the second-harmonic scattered power drastically by adjusting the background permittivity. These findings are crucial for the design of nanostructured metallic frequency-conversion devices. Additionally, we compared the strengths, weaknesses, and validity of different theoretical approaches for nonlinear wave interactions at the nanoscale using our analytic solution of a complex nanophotonic geometry.
Article
Biochemistry & Molecular Biology
Puran Pandey, Sundar Kunwar, Ki-Hoon Shin, Min-Kyu Seo, Jongwon Yoon, Woong-Ki Hong, Jung-Inn Sohn
Summary: By developing a Ag@Al2O3@Ag plasmonic core-shell-satellite (PCSS) structure, highly sensitive and reproducible SERS detection has been achieved. The key lies in fabricating PCSS nanostructures and utilizing the Al2O3 shell to generate electromagnetic hotspots, which is expected to play an important role in practical applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Puran Pandey, Min-Kyu Seo, Ki Hoon Shin, Young-Woo Lee, Jung Inn Sohn
Summary: In this study, a hierarchically assembled 3D plasmonic metal-dielectric-metal hybrid nano-architecture was designed and prepared for high-performance surface-enhanced Raman scattering (SERS) sensing. The fabricated PMDM hybrid nanostructures exhibited strong SERS signals with highly enhanced electromagnetic hot spots, achieving outstanding SERS performance.
Article
Optics
Caiyue Zhao, Lirong Cheng, Houyu Chen, Simei Mao, Yinghui Wang, Qian Li, H. Y. Fu
Summary: We have designed, fabricated, and characterized a compact dual-mode waveguide crossing on a silicon-on-insulator platform. The high-performance crossing structure is achieved through the use of adjoint shape optimization. Experimental results demonstrate low insertion loss and crosstalk, with insertion losses of 0.83 dB and 0.50 dB for TE0 and TE1 modes at 1550 nm wavelength, respectively, and crosstalk less than -20 dB for the two modes over a wavelength range of 80 nm. The total footprint of the structure is only 5 x 5 μm².
Article
Chemistry, Multidisciplinary
Martin Rothe, Yuhang Zhao, Johannes Mueller, Guenter Kewes, Christoph T. Koch, Yan Lu, Oliver Benson
Summary: This study demonstrates local, subdiffraction limited chiral coupling of light and propagating surface plasmon polaritons in a self-assembled system. Characterization of the nanoantenna-nanowire systems is done comprehensively through various imaging techniques, supported by three-dimensional numerical simulations. The system shows promise for on-chip sensing of chiral analytes far below the diffraction limit.
Article
Engineering, Electrical & Electronic
Anna A. Ermina, Nikolay S. Solodovchenko, Vladimir S. Levitskii, Nadejda A. Belskaya, Sergey I. Pavlov, Vladimir O. Bolshakov, Vladimir A. Tolmachev, Yuliya A. Zharova
Summary: This study investigates the optical and plasmonic properties of structures based on hemispherical silver nanoparticles on a silicon substrate, and finds that they have potential applications in surface-enhanced Raman scattering (SERS) and dye detection.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Chemistry, Physical
Taerin Chung, Sang-Hyuk Lee
Summary: This study investigates the influence of shape on the optical properties of gold nanostars (GNS) and identifies the optimal geometry for surface-enhanced Raman scattering (SERS) applications with different excitation wavelengths.
Article
Chemistry, Multidisciplinary
Tingting Lin, Tianyi Yang, Yuhang Cai, Jingwei Li, Guangxiang Lu, Shuangqun Chen, Yi Li, Liang Guo, Stefan A. Maier, Changxu Liu, Jianfeng Huang
Summary: Inspired by transformation optics, we propose a new concept for plasmonic photocatalysis by creating a novel hybrid nanostructure with a plasmonic singularity. Our geometry enables broad and strong spectral light harvesting at the active site of a nearby semiconductor where the chemical reaction occurs. The insights gained from this work might be beneficial for designing efficient composite plasmonic photocatalysts for diverse photocatalytic reactions.
Article
Nanoscience & Nanotechnology
Binaya Kumar Sahu, Anil Pal, S. T. Reshma, A. Das
Summary: The study reports the fabrication of a highly efficient Ag SERS substrate and verifies the existence of the Raman A(1g) mode in rutile SnO2 quantum dots. It also discovers the presence of an intense IR-active E-u (TO) mode in 25 nm size crystalline SnO2, suggesting an explanation based on the gradient-field Raman (GFR) effect.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Ryan Kisslinger, Saralyn Riddell, Ajay P. Manuel, Kazi M. Alam, Aarat P. Kalra, Kai Cui, Karthik Shankar
Summary: The study demonstrates the formation of Ta2O5 nano-dimple arrays on non-native substrates and the synthesis of gold nanoparticles (Au NPs) on these arrays through anodization and annealing processes. Various factors affecting the formation of the arrays and the properties of Au NPs were investigated. The resulting plasmonic heterojunctions showed significantly higher local field enhancement and catalytic activity compared to Au NPs on quartz substrates.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Amrindra Pal, Mohammed Zaheer Ahmed, Sandip Swarnakar
Summary: All-optical logic gates have great potential in ultra-high-speed Boolean operation and logical computation. This study proposes XOR, OR, and NOT gates using metal-insulator-metal waveguides with a smaller footprint than previously reported. The device's performance is analyzed using the finite-difference time-domain method (FDTD) and verified through MATLAB simulation, with an extinction ratio of 27.80 dB. These logic gates can serve as key components in optical communication and pave the way for new designs in plasmonic integrated circuits.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Optics
Samaneh Pakniyat, Shahrokh Jam, Alireza Yahaghi, George W. Hanson
Summary: In this work, a plasmonic right-angled waveguide bend and divider are proposed using Transformation Optics. The continuous refractive index media for the bend and T-shaped divider are realized with graphene in the terahertz frequency range, showing promise for THz device applications.
Article
Engineering, Electrical & Electronic
Mohammadrahim Kazemzadeh, Colin L. Hisey, Priscila Dauros-Singorenko, Simon Swift, Kamran Zargar-Shoshtari, Weiliang Xu, Neil G. R. Broderick
Summary: Bacterial extracellular vesicles (EVs) are nano-scale lipid-enclosed packages that play important roles in various biological processes. This study demonstrates the potential of using surface-enhanced Raman spectroscopy (SERS) and machine learning algorithms to rapidly classify and characterize bacterial EVs, which is crucial for the development of their laboratory and clinical applications.
IEEE SENSORS JOURNAL
(2022)
Article
Automation & Control Systems
Shahab Kazemi, Ryman Hashem, Martin Stommel, Leo K. Cheng, Weiliang Xu
Summary: This study implements closed-loop methods for controlling gastric simulators for the first time, demonstrating the superiority of closed-loop techniques over open-loop approaches through experimental results. By using the RiSPA bellows-driven soft pneumatic actuator as the main actuation system, all technical aspects of implementing closed-loop control and sensor-actuator integration are discussed in detail.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Review
Chemistry, Physical
Fa Yang, Weilin Xu
Summary: The development of cost-effective, high-performance catalysts at the atomic level is crucial for large-scale applications of renewable clean energy conversion. Single-atomic site catalysts (SACs) have great potential as next-generation materials, with the introduction and coupling of synergistic components to improve activity. Various atomic-coupling structures, including SAC-NPs, SACCs, DACs, and SAAs, offer unique synergistic effects that need further exploration and comparison.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Optics
Mohammadrahim Kazemzadeh, Colin L. Hisey, Kamran Zargar-Shoshtari, Weiliang Xu, Neil G. R. Broderick
Summary: A new method for classifying biological Raman spectra without the need for preprocessing steps has been proposed, showing superiority over conventional methods.
OPTICS COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Xiaodong Liu, Xin Ge, Jing Cao, Yi Xiao, Yan Wang, Wei Zhang, Ping Song, Weilin Xu
Summary: This study investigated the catalysis of Pt SAC at the single-molecule single-atom level and found both static and dynamic activity heterogeneity. It was revealed that the intrinsic catalytic activity of Pt SAC is higher than that of Pt nanoparticles, and there is no catalysis-induced surface restructuring in Pt SAC. Density functional theory calculations further suggested that the unique catalytic properties of Pt SAC or the differences between Pt SAC and nanoparticles could be attributed to the strong adsorptions, large surface energy, and strong binding of Pt-1 species.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Bingbao Mei, Cong Liu, Fanfei Sun, Siyu Lu, Xianlong Du, Xiaopeng Li, Fei Song, Weilin Xu, Zheng Jiang
Summary: Potential-dependent selectivity changes are widely observed in electrocatalysis, but a detailed understanding of these changes at an atomic level is still lacking. In this study, we use a model atomically dispersed nickel catalyst to obtain a comprehensive view of potential-induced structure changes during the CO2 reduction reaction. Our findings show that the catalyst exhibits volcano-like selectivity changes that are dependent on the distance between the nickel atom and the carbon basal plane. Theoretical calculations suggest that local dynamic behaviors play a crucial role in regulating the distribution of the d band center of nickel.
Article
Chemistry, Multidisciplinary
Mohammadrahim Kazemzadeh, Miguel Martinez-Calderon, Song Y. Paek, MoiMoi Lowe, Claude Aguergaray, Weiliang Xu, Lawrence W. Chamley, Neil G. R. Broderick, Colin L. Hisey
Summary: Placental extracellular vesicles (EVs) play important roles in pregnancy, but they are also implicated in the progression of preeclampsia. A fabrication process called laser-induced nano-structuring of SERS-active thin films (LINST) was developed to produce substrates that allow the biochemical fingerprinting of EVs. The findings encourage the exploration of surface-enhanced Raman spectroscopy (SERS) of EVs as a promising method for preeclampsia liquid biopsies.
Article
Chemistry, Analytical
Mohammadrahim Kazemzadeh, Miguel Martinez-Calderon, Weiliang Xu, Lawrence W. Chamley, Colin L. Hisey, Neil G. R. Broderick
Summary: Machine learning has significantly impacted the value of spectroscopic characterization tools, especially in biomedical applications. However, the extensive data preprocessing required often introduces bias. To address this, researchers developed two deep learning methods capable of fully preprocessing spectroscopy data without human input. The findings suggest that these methods outperform conventional approaches in terms of speed, defect tolerance, and classification accuracy.
ANALYTICAL CHEMISTRY
(2022)
Article
Automation & Control Systems
Dipankar Bhattacharya, Ryman Hashem, Leo K. Cheng, Weiliang Xu
Summary: This study presents the design and implementation of a novel robotic soft esophagus (RoSEv2.0) for esophageal stent testing and food viscosity studies. The RoSEv2.0 is equipped with embedded time of flight (TOF) and pressure sensors for modeling and control. Model predictive control (MPC) using SINDYC models was implemented to autonomously govern peristalsis and air pressure. Successful generation of peristalsis waves and migration testing of stents were achieved.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Yuan Guo, Qianqian Tong, Xianzhong Liu, Xuesong Bian, Zhihao Zhang, Yuru Zhang, Weiliang Xu, Dangxiao Wang
Summary: In this paper, a magnetically responsive soft tactile device (MRS-Tex) is proposed for rendering high-resolution surface textures. By using a 1 mm diameter soft actuator and a soft membrane bracket, the device is capable of generating sufficient depth pits and achieving high discrimination accuracy according to quantitative experiments and user studies.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Zixiao Chen, Zhicong Deng, Jaspreet Singh Dhupia, Martin Stommel, Weiliang Xu
Summary: This article introduces a new control framework for a soft robotic table, which has been experimentally proven to effectively achieve trajectory tracking control.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Automation & Control Systems
Bangxiang Chen, Jaspreet S. Dhupia, Weiliang Xu
Summary: This article introduces a chewing robot based on an adjustable linkage mechanism, which can provide crushing and grinding capability on food and allows users to customize the movement of the molars. The article discusses the robot's movement and two different operation modes, and validates the effectiveness of the planning and control through experiments.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Review
Automation & Control Systems
Mahmoud Zarebidoki, Jaspreet Singh Dhupia, Weiliang Xu
IEEE ROBOTICS & AUTOMATION MAGAZINE
(2022)
Article
Automation & Control Systems
Zixiao Chen, Zhicong Deng, Jaspreet Singh Dhupia, Martin Stommel, Weiliang Xu
Summary: This article presents the development of a control framework for a soft robotic table, modeling the system through experiments and simulations, and designing a closed-loop trajectory tracking system. Experimental results show the effectiveness of the proposed trajectory tracking control method.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)