Article
Optics
Y. Ben-Aryeh
Summary: A theoretical model is developed for treating hot spot effects in a system of two nearby metallic spheres interacting with external propagating electromagnetic field. The final results for electric field enhancement are obtained in the present work by simple analytical functions. The equation for the enhancement of the electromagnetic field at the hot spot on the single molecule level is developed and compared with other works.
APPLIED PHYSICS B-LASERS AND OPTICS
(2021)
Article
Materials Science, Multidisciplinary
Weiming He, Xiangchao Ma, Jiali Jiang, Xin Wu, Jianqi Zhang
Summary: KV3Sb5, a material with superconductivity and unconventional electronic transport properties, exhibits excellent surface plasmon resonance effect in the infrared range. Compared with Au, KV3Sb5 has higher absorption efficiency and near-field enhancement for localized surface plasmon resonance. It has the potential for plasmon-mediated hot carrier applications, as it efficiently generates hot carriers through Landau damping, with comparable carrier propagation length and lifetime to Au.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Brinton King Eldridge, Saghar Gomrok, James W. Barr, Elise Anne Chaffin, Lauren Fielding, Christian Sachs, Katie Stickels, Paiton Williams, Yongmei Wang
Summary: Gap-enhanced Raman tags are a new type of optical probe that utilize the strong electric field inside the gap between two plasmonic metals to enhance the surface-enhanced Raman scattering response. Our study investigated Au@SiO22@Au nanoparticles with varying shell and gap thicknesses and found that the near-field enhancement spectra inside the gap were stronger than on the outer surface of the nanoparticle. We also discovered that a thin shell combined with a thin gap produced the greatest near-field enhancement.
Article
Chemistry, Physical
Wei Zhang, Tianxing Zheng, Bin Ai, Panpan Gu, Yuduo Guan, Yu Wang, Zhiyuan Zhao, Gang Zhang
Summary: Au-P-Au-coupled gold nanoparticle platforms with multiple nanogaps were fabricated using nanoskiving and polymer-assisted assembly. The platform showed strong electric field enhancement due to the confinement of incident light, leading to significant surface-enhanced Raman scattering performance and sensitive detection of glucose.
APPLIED SURFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Jiapeng Zheng, Christina Boukouvala, George R. Lewis, Yicong Ma, Yang Chen, Emilie Ringe, Lei Shao, Zhifeng Huang, Jianfang Wang
Summary: By using a halide-assisted differential growth strategy, chiral Au nanoparticles with tunable sizes and diverse morphologies can be synthesized. These nanoparticles have applications in constructing optical metamaterials, sensing chiral molecules, and activating immune cells.
NATURE COMMUNICATIONS
(2023)
Article
Spectroscopy
Yan-ling Liu, Jian Zhu, Guo-jun Weng, Jian-jun Li, Jun-wu Zhao
Summary: This paper investigates the longitudinal plasmon mode optical properties and localized electric field distribution of a single pentagonal gold nanotube for the first time using the discrete dipole approximation. It is found that the pentagonal gold nanotube has a stronger electric field distribution compared to circular gold nanotubes at the plasmon resonance peak. Additionally, the longitudinal plasmon resonance peak shifts non-linearly towards blue with increasing wall thickness, but shifts linearly towards red with increasing length of the pentagonal gold nanotube. The analysis of the localized electric field reveals that the longitudinal plasmon peak of the pentagonal gold nanotube originates from the dipole resonance mode and the local electric field intensity is controlled by the wall thickness and length. Notably, the effect of wall thickness on the longitudinal plasmon resonance and electric field enhancement can be attributed to the change in plasmon coupling position and intensity. This work enriches the theoretical research of pentagonal gold nanotubes and provides ideas for the preparation of high sensitivity nanoprobes biosensors.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Baodong Gai, Jingwei Guo
Summary: A plasmonic array pair structure composed of two stacked finite square array panels is proposed in this work, and by twisting the structure, its plasmonic SLR changes significantly. The simulation results show that optical properties, such as resonance peaks, change inversely when the structure is twisted.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Han-Kyu Choi, Sang-Min Park, Jeeyoon Jeong, Hankyul Lee, Gyu Jin Yeon, Dai-Sik Kim, Zee Hwan Kim
Summary: In this study, a simple photolithographic method was demonstrated to generate highly sensitive SERS hot spot structures at desired positions. The solid-state dewetting of an Ag thin film using a continuous-wave laser resulted in the formation of closely packed assemblies of hemispherical Ag nanoislands with substantial plasmonic-field enhancement. These hot spot structures can be utilized as position-specific chemical-sensing elements in integrated analytical devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
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
Chemistry, Physical
Olga Guselnikova, Roman Elashnikov, Vaclav Svorcik, Martin Kartau, Cameron Gilroy, Nikolaj Gadegaard, Malcolm Kadodwala, Affar S. S. Karimullah, Oleksiy Lyutakov
Summary: The use of surface enhanced Raman scattering (SERS) combined with disposable chiral plasmonic shurikens and silver nanoclusters allows for effective detection and discrimination of chiral compounds with high sensitivity. Numerical simulations were used to study the effects of shuriken geometry, silver nanostructured layer parameters, and SERS excitation wavelength(s) on the observed SERS response. The designed structures were able to successfully discriminate cysteine enantiomers and probe biomolecular chirality using a standard Raman spectrometer.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Physical
Melissa Guarino-Hotz, A'Lester C. Allen, Ankai Wang, Shengli Zou, Jin Z. Zhang
Summary: This study synthesized two novel urchinlike plasmonic nanostructures, hollow gold nanostars (HNSs) and silver-coated hollow gold nanostars (AgHNSs), and explored their structural and optical properties, as well as their potential applications in surface-enhanced Raman scattering (SERS) and biomedical field. The results demonstrated that these nanomaterials displayed tunable structural and optical properties, and exhibited higher SERS enhancement compared to previous reports. The experimental findings were supported by discrete dipole approximation (DDA) simulations and elemental analyses, which provided insights into the enhancement mechanisms of these nanostructures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Optics
Patrick C. Chaumet, Guillaume Maire, Anne Sentenac
Summary: The discrete dipole approximation (DDA) is an efficient method for simulating electromagnetic scattering by objects with arbitrary shape and permittivity. Recovering the field inside the object requires solving a dense linear system iteratively, which can be time-consuming. To reduce the computational time, a scalar approximation solution is proposed as an initial guess, leading to a potential 50% reduction in solving time. Furthermore, preconditioning the system can accelerate convergence by up to a factor of 5, particularly for homogeneous objects on a plane substrate.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Nanoscience & Nanotechnology
Yan-Ling Liu, Jian Zhu, Guo-Jun Weng, Jian-Jun Li, Jun-Wu Zhao
Summary: This paper investigates the optical properties and local electric field distribution of the transverse plasmon mode of a single pentagonal gold nanotube using the discrete dipole approximation (DDA) for the first time. The study shows that the transverse plasmon peaks can shift nonlinearly from visible to infrared region by controlling the inner diameter, and the number of peaks increases when the tube wall is thin enough. By tuning the inner and outer diameter parameters, selective control over the transverse plasmon spectra of gold nanotube can be achieved, which is significant for the study of optical properties and applications in molecular detection and biological imaging.
Article
Engineering, Environmental
Mengxiang Song, Deming Huang, Nan Huo, Essy Kouadio Fodjo, Wei Deng, Dan Li
Summary: This study developed a stimulus-responsive three-dimensional microgel decorated with nanoparticles, which allows precise control of hot spots region by regulating temperature and moisture. It can simultaneously regulate structures and capture target molecules, as well as self-clean, achieving recyclable and reliable SERS analysis of solid samples.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Ankai Wang, Shengli Zou
Summary: The research found that near the surface of nanoparticles, the enhancement factor of the radiative decay rate of multiple emitters can be significantly smaller than that of one emitter, and has an asymmetric line shape. The real and imaginary parts of the index of refraction of nanoparticles are critical for the enhancement factor of six emitters, and asymmetric line shape appears when the real part is less than that of the environmental medium.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Yun Yu, Jeffrey D. Williams, Katherine A. Willets
FARADAY DISCUSSIONS
(2018)
Article
Chemistry, Physical
Yun Yu, Vignesh Sundaresan, Katherine A. Willets
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Physical
Vignesh Sundaresan, Joseph W. Monaghan, Katherine A. Willets
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Physical
Yun Yu, Jeffrey D. Williams, Katherine A. Willets
FARADAY DISCUSSIONS
(2018)
Article
Electrochemistry
Vignesh Sundaresan, Joseph W. Monaghan, Katherine A. Willets
Editorial Material
Chemistry, Physical
Hassan Alzahrani, Cameron Bentley, Rob Burrows, Chan Cao, Qiong Cai, Chrys Chikere, Richard M. Crooks, Johan Dunevall, Martin Edwards, Andrew Ewing, Rui Gao, Robert Hillman, Mohi Kahram, Frederic Kanoufi, Christine Kranz, Jean-Francois Lemineur, Yitao Long, Kim McKelvey, Michael Mirkin, Stacy Moore, Wojciech Nogala, Hang Ren, Wolfgang Schuhmann, Patrick Unwin, Andrea Vezzoli, Henry White, Katherine Willets, Zhugen Yang, Yilun Ying
FARADAY DISCUSSIONS
(2018)
Editorial Material
Chemistry, Physical
Hassan Alzahrani, Christophe Antoine, Lane Baker, Sebastien Balme, Gourav Bhattacharya, Paul W. Bohn, Qiong Cai, Chrys Chikere, Richard M. Crooks, Naren Das, Martin Edwards, Cyril Ehi-Eromosele, Niklas Ermann, Lei Jiang, Frederic Kanoufi, Christine Kranz, Yitao Long, Julie MacPherson, Kim McKelvey, Michael Mirkin, Richard Nichols, Wojciech Nogala, Juan Pelta, Hang Ren, Jennifer Rudd, Wolfgang Schuhmann, Zuzanna Siwy, Zhongqun Tian, Patrick Unwin, Liping Wen, Henry White, Katherine Willets, Yanfang Wu, Yilun Ying
FARADAY DISCUSSIONS
(2018)
Article
Chemistry, Multidisciplinary
Yun Yu, Kanishka D. Wijesekara, Xiaoxing Xi, Katherine A. Willets
Article
Chemistry, Physical
Xiaoyu Cheng, Taryn P. Anthony, Claire A. West, Zhongwei Hu, Vignesh Sundaresan, Aaron J. McLeod, David J. Masiello, Katherine A. Willets
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Katherine A. Willets
Article
Chemistry, Multidisciplinary
Ujjal Bhattacharjee, Claire A. West, Seyyed Ali Hosseini Jebeli, Harrison J. Goldwyn, Xiang-Tian Kong, Zhongwei Hu, Elliot K. Beutler, Wei-Shun Chang, Katherine A. Willets, Stephan Link, David J. Masiello
Review
Chemistry, Multidisciplinary
Judith Langer, Dorleta Jimenez de Aberasturi, Javier Aizpurua, Ramon A. Alvarez-Puebla, Baptiste Auguie, Jeremy J. Baumberg, Guillermo C. Bazan, Steven E. J. Bell, Anja Boisen, Alexandre G. Brolo, Jaebum Choo, Dana Cialla-May, Volker Deckert, Laura Fabris, Karen Faulds, F. Javier Garcia de Abajo, Royston Goodacre, Duncan Graham, Amanda J. Haes, Christy L. Haynes, Christian Huck, Tamitake Itoh, Mikael Ka, Janina Kneipp, Nicholas A. Kotov, Hua Kuang, Eric C. Le Ru, Hiang Kwee Lee, Jian-Feng Li, Xing Yi Ling, Stefan A. Maier, Thomas Mayerhofer, Martin Moskovits, Kei Murakoshi, Jwa-Min Nam, Shuming Nie, Yukihiro Ozaki, Isabel Pastoriza-Santos, Jorge Perez-Juste, Juergen Popp, Annemarie Pucci, Stephanie Reich, Bin Ren, George C. Schatz, Timur Shegai, Sebastian Schlucker, Li-Lin Tay, K. George Thomas, Zhong-Qun Tian, Richard P. Van Duyne, Tuan Vo-Dinh, Yue Wang, Katherine A. Willets, Clauanlai Xu, Hongxin Xu, Yikai Xu, Yuko S. Yamamoto, Bing Zhao, Luis M. Liz-Marzan
Article
Nanoscience & Nanotechnology
Zhuolei Zhang, Yun Yu, Yichao Tang, Ying-shi Guan, Yong Hu, Jie Yin, Katherine Willets, Shenqiang Ren
ADVANCED ELECTRONIC MATERIALS
(2020)
Editorial Material
Chemistry, Physical
Emiliano Cortes, Alexander O. Govorov, Hiroaki Misawa, Katherine A. Willets
JOURNAL OF CHEMICAL PHYSICS
(2020)
Review
Chemistry, Physical
Katherine A. Willets
CURRENT OPINION IN ELECTROCHEMISTRY
(2019)