Article
Materials Science, Multidisciplinary
Chaojun Tang, Qingmiao Nie, Pinggen Cai, Fanxin Liu, Ping Gu, Zhendong Yan, Zhong Huang, Mingwei Zhu
Summary: In this study, we theoretically investigate the enhancement of ultra-broadband near-infrared absorption in monolayer graphene by using a multiple-resonator approach. We demonstrate that by carefully designing the nanostructure with multiple one-dimensional nanogrooves on metal surfaces, the absorption efficiency of graphene can be significantly improved to over 60% in a wide near-infrared wavelength range. This work is of interest for the development of photoelectric devices, such as infrared photodetectors.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Chemistry, Physical
Tamitake Itoh, Yuko S. Yamamoto
Summary: In this study, we investigate the spectral relationships between electromagnetic enhancement, surface-enhanced resonant Raman scattering (SERRS), and surface-enhanced fluorescence (SEF) by using single silver nanoparticle dimers as a model system. We focus on the lowest-energy plasmon in far-field scattering and classify the spectral relationships into two types. Based on our analysis, we find that dipole-dipole and dipole-quadrupole-coupled plasmon resonance are responsible for the electromagnetic enhancement.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Vien Thi Tran, Heongkyu Ju
Summary: This study demonstrates the enhancement of fluorescence emitted from dye molecules coupled with two surface plasmons: localized surface plasmons induced by silver nanoparticles (AgNPs) and surface plasmons supported by thin silver film. By coating a 50 nm-thick Ag film on one surface of a SiO2 layer, waveguide-modulated version of surface plasmon coupled emission (SPCE) can be achieved, providing opportunities for optimizing the waveguide structure to enhance fluorescent signals. The combined effect of LSP enhanced dye excitation and waveguide-modulated SPCE could potentially enhance fluorescent signals for highly sensitive detection of biomedical and chemical substances.
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, Physical
Xin Su, Qinghuang Bao, Shiping Zhan, Yuting Liu, Guozheng Nie, Qiong Liu, Xiaofeng Wu
Summary: This work proposes a plasmonic pattern/UCNPs/metal film hybrid metasurface with ultrahigh upconversion enhancement factor to address the significant challenge of low quantum efficiency in lanthanide doped upconversion nanoparticles (UCNPs). The plasmonic absorption bands are precisely controlled to match both the excitation and emission wavelength of UCNPs, achieving enhancement of upconversion fluorescence by 4-6 orders of magnitude. This approach provides an effective way to achieve highly efficient upconversion emission and has practical applications in solar cells and biological detection. (C) 2022 Published by Elsevier B.V.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jing Chen, Lianjie Zhao, Yong Cheng, Zhendong Yan, Xiangxian Wang, Chaojun Tang, Fan Gao, Zao Yi, Mingwei Zhu
Summary: In this work, both broadband and narrowband absorption peaks are achieved in monolayer graphene by introducing periodic arrays of silver nanodisks. The broadband absorption peak is attributed to localized dipolar plasmon resonances in individual silver nanodisks, while the narrowband absorption peak arises from collective first-order diffraction coupling effect. The full width at half maximum (FWHM) of the broadband absorption peak can be varied from 100 nm to 50 nm by changing the array period, and the FWHM of the narrowband absorption peak can be tuned from about 6.4 nm to only 0.25 nm, realizing an ultra-narrow sub-nanometer bandwidth.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zhendong Yan, Lei Gao, Chaojun Tang, Bin Lv, Ping Gu, Jing Chen, Mingwei Zhu
Summary: We study the simultaneous narrowband and broadband light absorption enhancement of monolayer graphene on a metallic substrate with a periodic array of small holes. The absorption peaks of graphene are proven to stem from the hybrid modes of delocalized surface plasmon polaritons propagating on the substrate surface and localized magnetic plasmons confined within individual holes. The positions, maxima, and bandwidths of the absorption peaks can be tuned through changing the hole array period. The maximum absorption values at the narrowband and broadband peaks can reach up to 65% and 85%, respectively. The bandwidths of the absorption peaks can be conveniently adjusted, with the narrowband peak reduced to several nanometers and the broadband peak expanded to tens of nanometers.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Optics
S. Koutsares, L. S. Petrosyan, S. Prayakarao, D. Courtwright, C. E. Bonner, T. Shahbazyan, M. A. Noginov
Summary: We explored emission kinetics of dye-doped polymeric films on glass and silver, finding concentration quenching near the metallic surface. Theoretical models were used to explain the observed phenomena in Fabry-Perot cavities.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Physics, Applied
Haiyuan Wei, Ziying Tang, Yan Shen, Huying Zheng, Yaqi Wang, Runchen Wang, Hai Zhu, Shichen Su, Yunliang Zhu, Jie Zhou, Zhi Ren Qiu
Summary: In this study, the progress of nanoengineering on noble metals and the extreme nonlinear optics within nanometric volumes are explored. Plasmonic nanostructures are found to offer a unique route for enhancing high-order harmonic generation and other nonlinear optical progress. The researchers demonstrated a strong third harmonic emission in zinc oxide microbelts through a strong localization of electromagnetic field caused by localized surface plasmon resonances. The intensity of third-harmonic generation was enhanced significantly in a composite of microbelts and Au nanoparticles, compared to the bare microbelts. Additionally, the polarization characteristics of the third-harmonic generation in the same system were improved significantly.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Chemistry, Physical
Xueqing Q. Yang, Yao Lu, Yi Liu, Jing Wang, Lei Shao, Jianfang F. Wang
Summary: Plasmonic heterostructures composed of plasmonic metal nanocrystals and semiconductors or metals have attracted extensive attention and have been applied in optoelectronics, biotechnologies, catalysis, and light harvesting fields. They possess unique plasmonic properties and various deposited materials, allowing partial deposition of functional materials through site-selective overgrowth.
Article
Chemistry, Physical
Martin A. Mosquera, Juan M. Marmolejo-Tejada, Nicholas J. Borys
Summary: In this study, the coupling between plasmonic excitations of metallic interfaces and nanostructures and electronic excitations in semiconductors was investigated using quantum modeling. New polariton states were identified, which could have significant implications for optoelectronic technologies.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Hong-Xia Liu, Yue-Gang Chen
Summary: Resonances in micrometer metallic cavities play a crucial role in material-light interactions. Different cavity shapes were studied using the FDTD method, revealing distinct surface plasmon polariton resonances. Transitioning a trapezoidal cavity to a W-shaped cavity led to the excitation of localized surface plasmon resonance at the wedge tip, interacting with other resonance modes to create new effects like localized surface plasmon induced transparency and Fano resonance.
Article
Chemistry, Analytical
Xin Jin, Yingzhu Liu, Obtin Alkhamis, Juan Canoura, Adara Bacon, Ruyi Xu, Fengfu Fu, Yi Xiao
Summary: This study overcomes the impaired sensitivity of aptamer-based dye-displacement assays in biospecimens by utilizing the near-infrared (NIR) signatures of the dye. By dispersing the dye into solution to form detectable J-aggregates, this method enables high-throughput detection of different small-molecule analytes in clinical specimens.
ANALYTICAL CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Michele Ghini, Nicola Curreli, Matteo B. Lodi, Nicolo Petrini, Mengjiao Wang, Mirko Prato, Alessandro Fanti, Liberato Manna, Ilka Kriegel
Summary: This study demonstrates the depletion layer engineering and control in ITO/In2O3 nanocrystals through tuning the shell thickness or photodoping, enabling the design and prediction of their optoelectronic properties and enhancing charge storage capability.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Runze Chen, Xiaoyu Cheng, Chi Zhang, Hao Wu, Haiming Zhu, Sailing He
Summary: This study demonstrates that light metals can generate optical responses comparable to noble metal nanoclusters, but at shorter wavelengths. The synthesis of size-uniform sub-3 nm aluminum nanocrystals with photoluminescence in the ultraviolet range, and the partial modulation of the photoluminescence, suggest new frontiers for nanocluster research with light metals.
Article
Chemistry, Physical
Wai Jue Tan, Philip A. Thomas, Isaac J. Luxmoore, William L. Barnes
Summary: The study explores the strong coupling between surface plasmons and molecular excitons, where an additional anti-crossing feature may arise at high oscillator strengths, but the physics behind this double anti-crossing feature is still unclear. Extensive transfer matrix simulations reveal different anti-crossing features between surface plasmons and excitonic resonances at different oscillator strengths.
JOURNAL OF CHEMICAL PHYSICS
(2021)
News Item
Optics
Bill Barnes
Article
Multidisciplinary Sciences
Justus Bohn, Ting Shan Luk, Craig Tollerton, Sam W. Hutchings, Igal Brener, Simon Horsley, William L. Barnes, Euan Hendry
Summary: The study focuses on the pump-dependent properties of plasmon resonance in the ENZ region of indium tin oxide (ITO) thin film, demonstrating a thermal switching mechanism and highlighting a previously unisolated two-beam coupling contribution in ENZ nonlinear optics research.
NATURE COMMUNICATIONS
(2021)
Correction
Multidisciplinary Sciences
Justus Bohn, Ting Shan Luk, Craig Tollerton, Sam W. Hutchings, Igal Brener, Simon Horsley, William L. Barnes, Euan Hendry
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Philip A. Thomas, Kishan S. Menghrajani, William L. Barnes
Summary: The study demonstrates that external structures are unnecessary for achieving room-temperature ultrastrong light-matter coupling. This discovery could aid in the design of experiments to probe polaritonic chemistry and suggests that polaritonic states may be easier to realize than previously thought.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Milo Baraclough, Ian R. Hooper, William L. Barnes
Summary: The formation of polariton modes has led to exciting developments in physics, chemistry, and materials science. The emerging field of polaritonic chemistry explores the potential of modifying molecular materials by strongly coupling them to confined light fields. The use of metamaterials offers a complementary approach for studying strong coupling phenomena at the cm-scale and enables probing the response of individual metamolecules under strong coupling conditions.
Article
Chemistry, Physical
Adarsh B. Vasista, William L. Barnes
Summary: This letter discusses the procedure of coupling multiple molecular species in soft cavities and observes the formation of a middle polariton branch due to intermolecular mixing. The coupling strength is found to be greater than the cavity line width and molecular absorption line width, indicating strong coupling in the system.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Harry Penketh, William L. Barnes, Jacopo Bertolotti
Summary: Computational ghost imaging is a method for reconstructing images by illuminating an object with known patterns and collecting scattered light. It has been found that by choosing different illumination patterns, the reconstruction process can behave like a spatial filtering operation on the image, allowing for bypassing post-processing steps and avoiding noise amplification.
Article
Materials Science, Multidisciplinary
Kishan S. Menghrajani, Mingzhou Chen, Kishan Dholakia, William L. Barnes
Summary: Raman spectroscopy is a powerful technique for fingerprinting materials and molecules, but fluorescence interference is a common issue. Wavelength-modulated Raman spectroscopy can reduce fluorescence background, allowing clear recording of desired Raman signals. While studying vibrational strong coupling, advantages of the wavelength-modulated Raman approach are found, but results on strong coupling remain inconclusive, calling for further research.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Philip A. Thomas, Kishan S. Menghrajani, William L. Barnes
Summary: The authors demonstrate that phase singularities can be created and controlled, all optically, in a simple thin film of organic molecules using cavity-free strong light-matter coupling. This finding not only opens up new possibilities for the application of strong light-matter coupling, but also provides a new, simplified, and more versatile means of manipulating phase singularities.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
M. S. Rider, W. L. Barnes
Summary: This passage introduces a new research field of molecular strong coupling, where ensembles of molecules are hybridized with light to form new states known as polaritons. It provides an overview of essential phenomena and a conceptual framework using simple classical physics models for intuitive understanding. The passage also addresses open questions and exciting experimental and theoretical challenges ahead.
CONTEMPORARY PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Adarsh B. Vasista, Eduardo J. C. Dias, F. Javier Garcia de Abajo, William L. Barnes
Summary: The emergence of dielectric open optical cavities has provided a new research direction in nanophotonics. Dielectric microspheres can support a variety of cavity modes and are ideal for studying molecule-cavity interactions. Understanding molecule-cavity coupling and the role of spatial mode profiles is essential for optimizing the coupling strength.
Article
Chemistry, Physical
Wai Jue Tan, Philip A. Thomas, William L. Barnes
Summary: In the absence of strong coupling, an anticrossing phenomenon is observed in planar silver/dielectric structures near the epsilon-near-zero point due to impedance matching between the silver and dielectric layers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Multidisciplinary
A. M. Paniagua-Diaz, W. L. Barnes, J. Bertolotti
Summary: This work investigates how much energy from a fully developed speckle pattern can be converted into a high quality (low M (2)) beam using wavefront shaping. The study provides a theoretical framework and discusses the advantages and limitations of this approach.
Article
Chemistry, Multidisciplinary
Philip A. Thomas, Wai Jue Tan, Vasyl G. Kravets, Alexander N. Grigorenko, William L. Barnes
Summary: This study re-examines the impact of infrared strong coupling on photoisomerization rates and finds that the variations observed can be attributed to the absorption of ultraviolet radiation in the cavity, rather than strong coupling. The results highlight the importance of ruling out non-polaritonic effects in cavity-based experiments.
ADVANCED MATERIALS
(2023)
