Article
Optics
Haonan Ling, Arnab Manna, Jialiang Shen, Ho-Ting Tung, David Sharp, Johannes Froch, Siyuan Dai, Arka Majumdar, Artur R. Davoyan
Summary: This study investigates the interaction between light and matter in van der Waals MoS2 nanophotonic devices and demonstrates deep subwavelength optical field confinement in nanostructures, which has the potential to significantly reduce the size of integrated photonic devices and opto-electronic circuits.
Article
Chemistry, Multidisciplinary
Alex E. Chen, Xue-Qun Xia, Jian-Shiung Hong, Kuan-Ren Chen
Summary: The study finds that light funneling can guide the flow of energy into subwavelength slits. In contrast to previous research on oblique incident light, this study reveals that light funneling in the slits can be highly asymmetric, even at small angles. This mechanism is explained by polarized fields and charges induced using Poynting vectors. It is shown that when light is obliquely incident to the slits perforated in a perfect electric conductor, asymmetrical fields and charges accumulate at the upper apex corners of the left (right) sides. When light is incident from the left (right) side, more (less) induced fields and charges accumulate in the left (right) slit corner, resulting in an increase (decrease) in the funneling width, area, and energy flow at the left (right) side.
Article
Chemistry, Multidisciplinary
Philipp Grimm, Stefan Zeissner, Maximilian Roedel, Simon Wiegand, Sebastian Hammer, Monika Emmerling, Enno Schatz, Rene Kullock, Jens Pflaum, Bert Hecht
Summary: This study presents a nanoscale organic light-emitting antenna (OLEA) structure that serves as a color- and directionality-switchable light source. The structure utilizes gold nanoantennas and an organic semiconductor to achieve color and emission direction switching based on the polarity of the applied voltage. The OLEA structure facilitates efficient radiation transfer and eliminates the need for transparent electrodes.
Article
Nanoscience & Nanotechnology
Young-Ho Jin, Juntaek Oh, Wonshik Choi, Myung-Ki Kim
Summary: The paper proposes a novel method to resolve individual eigenmodes of subwavelength nanostructures. By constructing a transmission matrix and utilizing singular value decomposition, the near-field profiles and energy spectra of individual eigenmodes can be effectively resolved. This method has significant implications for designing and utilizing optical devices.
Article
Engineering, Electrical & Electronic
Xuanru Zhang, Tie Jun Cui
Summary: The study introduces a novel toroidal plasmonic resonator that tightly compacts all resonance modes and reduces radiation loss, achieving a high quality factor. A trapped mode is excited by introducing a slit perturbation, doubling the confinement effect. The on-chip excitation of the trapped mode is analyzed, showing good agreement between experimental results and numerical simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Materials Science, Multidisciplinary
C. J. Valencia-Caicedo, E. I. Chaikina, A. V. Khomenko
Summary: We numerically studied the second-harmonic generation (SHG) from subwavelength GaAs relief gratings with and without Au nano-stripes. Our results showed that adding Au nano-stripes significantly enhanced the SHG efficiency, with more than 500 times enhancement and an absolute value of 1.2 x 10(-3)% when the intensity of pump light was 1 GW/cm(2).
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
Alexander Ewen Chen, Jian-Shiung Hong, Kuan-Ren Chen
Summary: The dynamics of transient light transmission through a subwavelength slit can be intricate, involving complex and diverse wave functions, phase delay, and constructive/destructive interferences. The concept of step phasors is used to illuminate the underlying novel physics without involving nonlinearity, and can also be generalized to study incident light profiles and phenomena involving plasmonic metamaterials.
Article
Chemistry, Multidisciplinary
Taewoo Ha, Daehan Yoo, Chaejeong Heo, Ferran Vidal-Codina, Ngoc-Cuong Nguyen, Kyung Ik Sim, Sang Hyun Park, Wujoon Cha, Sungsu Park, Jaime Peraire, Teun-Teun Kim, Young Hee Lee, Sang-Hyun Oh
Summary: This study demonstrates a subwavelength terahertz resonance imaging (STRING) technique that achieves ultra-sensitive molecular fingerprinting by combining local field enhancement and near-field effects. The results show that the STRING platform could enable the practical and sensitive detection and imaging of molecules and nanoparticles.
Article
Optics
Kaifu Deng, Xiaodong Zeng
Summary: A scheme is proposed to investigate nonlocal effects in metals by coupling localized graphene plasmons (GPs) with acoustic plasmons (APs). The APs on a structure composed of monolayer graphene and a metal film have different dispersions when the nonlocal response is considered. A graphene nanoribbon array efficiently couples incident light to the localized GPs on the ribbons and subsequently the APs. The strong coupling between the two kinds of plasmon, equivalent to electric field dipole interaction, is highly related to the acoustic plasmonic dispersion and induces different absorption spectra.
Article
Biochemical Research Methods
Gabriel Landini, Giovanni Martinelli, Filippo Piccinini
Summary: Storing color histological images digitally allows for processing and extracting quantitative data through methods such as color deconvolution, enabling new applications like morphological and histochemical segmentation, automated marker localization, and image enhancement.
Article
Multidisciplinary Sciences
Alessandro Tuniz, Boris T. Kuhlmey
Summary: This article introduces a new imaging method that achieves non-invasive super-resolution imaging by selectively amplifying evanescent waves, allowing for sub-wavelength image resolution.
NATURE COMMUNICATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Anne-Sophie Bonnet-Ben Dhia, Christophe Hazard, Florian Monteghetti
Summary: The paper investigates the complex plasmonic resonances for a 2D particle with a smooth boundary except for one straight corner, showing that these resonances are defined by the multivalued nature of some solutions of the corner dispersion relations. Through numerical results, it is demonstrated that complex scaling deforms the essential spectrum to reveal embedded plasmonic eigenvalues and complex plasmonic resonances. These results validate the research by Li and Shipman (2019) on particles exhibiting complex plasmonic resonances.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Engineering, Mechanical
Shin Hur, Hoyoon Jeon, Youngsoo Kim, Muhammad A. Shah, Jinsik Kim, Byung Chul Lee, Md. Anzan-Uz-Zaman
Summary: In this study, an acoustic metalens for underwater imaging was designed and the feasibility of subwavelength ultrasonic imaging was demonstrated. The proposed metalens is suitable for high-resolution ultrasound applications, such as biomedical and non-destructive imaging.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Teng-Fei Wei, Xiao-Hua Wang, Cheng-Hui Qu
Summary: A new complex-valued U-net (CU-net) is proposed for solving inverse scattering problem, which directly uses complex scattered data for inversion without preprocessing, leading to improved accuracy and efficiency of the final result.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Materials Science, Multidisciplinary
Thinhinane Aoudjit, Andreas Horrer, Sergei Kostcheev, Renaud Bachelot, Jerome Plain, Davy Gerard
Summary: This article reports a subwavelength imaging approach based on the interaction between the enhanced optical near-field around chiral nanoparticles and an azobenzene molecular probe. It is experimentally demonstrated that the near-field of chiral structures exhibit dissymmetry under left and right circular polarizations. The near-field dissymmetry factor, related to the local circular dichroism of the near-field intensity, can be experimentally mapped.
ADVANCED OPTICAL MATERIALS
(2023)
Correction
Optics
Kai Yao, Siqi Li, Zhiliang Liu, Yiran Ying, Petr Dvorak, Linfeng Fei, Tomas Sikola, Haitao Huang, Peter Nordlander, Alex K. -Y. Jen, Dangyuan Lei
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Aaron Bayles, Shu Tian, Jingyi Zhou, Lin Yuan, Yigao Yuan, Christian R. Jacobson, Corbin Farr, Ming Zhang, Dayne F. Swearer, David Solti, Minghe Lou, Henry O. Everitt, Peter Nordlander, Naomi J. Halas
Summary: This study introduces Al@TiO2 core-shell nanoparticles as active photocatalysts for hot electron-mediated H-2 dissociation reaction and hot hole-mediated methanol dehydration. The research indicates that the photocatalytic mechanism involves plasmonic hot carrier generation and subsequent transfer into the TiO2 layer. The Al@TiO2 antenna-reactor offers an earth-abundant solution for the future design of visible-light-driven plasmonic photocatalysts.
Article
Chemistry, Physical
Lin Yuan, Anvy Kuriakose, Jingyi Zhou, Hossein Robatjazi, Peter Nordlander, Naomi J. Halas
Summary: In this study, a n-TiO2 / aluminum (Al) nanodisk/p-GaN photoelectrode sandwich device was reported, which exhibited enhanced H2 generation efficiencies due to a combination of plasmon-enhanced processes. Hot electrons generated in the illuminated Al nanodisk were injected into the conduction band of the TiO2 layer, driving H2 evolution by transferring into water molecules adsorbed on the TiO2 surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Christian R. Jacobson, Gang Wu, Lawrence B. Alemany, Gopal Narmada Naidu, Minhan Lou, Yigao Yuan, Aaron Bayles, Benjamin D. Clark, Yukun Cheng, Arzeena Ali, Ah-Lim Tsai, Ian A. Tonks, Peter Nordlander, Naomi J. Halas
Summary: This study introduces a dual catalyst approach for the synthesis of Al nanocrystals, allowing control over both size and shape. By using two catalysts with different functions, precise control over the size and shape of the resulting Al nanocrystals can be achieved.
Article
Nanoscience & Nanotechnology
Benjamin Cerjan, Burak Gerislioglu, Stephan Link, Peter Nordlander, Naomi J. Halas, Mark Griep
Summary: This study focuses on the importance of meta-atom design in plasmonic metasurfaces, particularly in aspects like visible coloration and Fano resonances, and discusses their potential applications in the sensing field.
Article
Multidisciplinary Sciences
Yara Kadria-Vili, Oara Neumann, Yage Zhao, Peter Nordlander, Gary Martinez, James A. Bankson, Naomi J. Halas
Summary: A promising clinical trial using gold-silica core-shell nanostructures for near-infrared photothermal therapy of prostate cancer has been reported. In this study, PEGylated Gd2O3-mesoporous silica/gold core/shell nanoparticles were synthesized, which not only have near-infrared photothermal properties but also provide sufficient MRI contrast for visualization at therapeutic doses.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Yage Zhao, Ming Zhang, Alessandro Alabastri, Peter Nordlander
Summary: Using the discrete dipole approximation and topology optimization, we have designed all dielectric metasurfaces that can efficiently focus light into deep subwavelength hotspots. These metasurfaces have superior light focusing capabilities compared to traditional lenses, and can greatly enhance processes that depend on light intensity, such as light-powered membrane distillation and photocatalysis. Our approach can also be applied to optimize metasurfaces for other functionalities, like nonlinear optics or photothermal conversion.
Article
Chemistry, Multidisciplinary
Lin Yuan, Jingyi Zhou, Ming Zhang, Xuelan Wen, John Mark P. Martirez, Hossein Robatjazi, Linan Zhou, Emily A. Carter, Peter Nordlander, Naomi J. Halas
Summary: Investigated planar plasmonic antenna-reactor photocatalysts with two chemically distinct and spatially separated active sites, demonstrating different effects of reaction positioning. This study is important for precise control of complex chemical reactions.
Article
Chemistry, Physical
Minghe Lou, Junwei Lucas Bao, Linan Zhou, Gopal Narmada Naidu, Hossein Robatjazi, Aaron I. Bayles, Henry O. Everitt, Peter Nordlander, Emily A. Carter, Naomi J. Halas
Summary: Plasmonic metal nanostructures show highly efficient photocatalysis in the direct decomposition of hydrogen sulfide. Under visible light illumination, a 20-fold reactivity enhancement compared to thermocatalysis can be observed.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Parmeet Dhindsa, David Solti, Christian R. Jacobson, Anvy Kuriakose, Gopal Narmada Naidu, Aaron Bayles, Yigao Yuan, Peter Nordlander, Naomi J. Halas
Summary: This study provides direct insight into the role of catalyst molecular structure in controlling the morphology of aluminum nanocrystals (Al NCs) by systematically modifying the catalyst molecular structure.
Article
Multidisciplinary Sciences
Mary M. Bajomo, Yilong Ju, Jingyi Zhou, Simina Elefterescu, Corbin Farr, Yiping Zhao, Oara Neumann, Peter Nordlander, Ankit Patel, Naomi J. Halas
Summary: The combination of surface-enhanced Raman spectroscopy (SERS) with machine learning (ML) shows promise in detecting and identifying priority pollutants in complex multicomponent mixtures. By using an unsupervised ML algorithm, characteristic SERS peaks of unknown components can be extracted from the spectra and identified against a spectral library.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Yigao Yuan, Linan Zhou, Hossein Robatjazi, Junwei Lucas Bao, Jingyi Zhou, Aaron Bayles, Lin Yuan, Minghe Lou, Minhan Lou, Suman Khatiwada, Emily A. Carter, Peter Nordlander, Naomi J. Halas
Summary: Plasmonic photocatalysis can transform a thermally unreactive transition metal into a catalytically active site, achieving efficient photocatalytic decomposition of ammonia.
Article
Chemistry, Multidisciplinary
Mirko Vanzan, Gabriel Gil, Davide Castaldo, Peter Nordlander, Stefano Corni
Summary: Hot electron photocatalysis is a fascinating field with great technological potential. However, the mechanisms behind it are not fully understood. In this study, we propose a mechanism based on transient electron spillover and energy release into vibrational modes. Using real-time Time Dependent Density Functional Theory, we simulate the dynamics of hot electrons moving on chains of Ag or Au atoms with different adsorbates. Our results show that specific modes are selectively activated, and the energy transfer depends on the adsorbate, metal, and hot electron energy. This mechanism could play a significant role in hot electron photocatalysis.
Article
Chemistry, Multidisciplinary
Yilong Ju, Oara Neumann, Mary Bajomo, Yiping Zhao, Peter Nordlander, Naomi J. Halas, Ankit Patel
Summary: This article presents a machine learning algorithm that can identify chemicals by matching their SERS spectra to a standard Raman spectral library. The algorithm uses a facial recognition-like approach for spectral recognition and quantifies the degree of similarity to a Raman spectrum using a metric called Characteristic Peak Similarity (CaPSim). The analysis shows that CaPSim outperforms existing spectral matching algorithms in terms of accuracy. This machine learning-based approach could greatly facilitate the spectroscopic identification of molecules in fieldable SERS applications.
Article
Multidisciplinary Sciences
Luke Henderson, Oara Neumann, Yara Kadria-Vili, Burak Gerislioglu, James Bankson, Peter Nordlander, Naomi J. Halas
Summary: This study reports a novel nanoparticle Gd2O3-NM, which is a multilayered nanoparticle structure capable of both magnetic resonance imaging (MRI) and photothermal therapy (PTT). Gd2O3-NM exhibits excellent stability and imaging performance, providing a new option for tumor treatment and diagnosis.
