Chiroptical responses of chiral plasmonic nanoparticles are influenced by their morphology, yet the impact of supporting substrates is significant but not fully understood. In this study, we numerically investigate th...Chiroptical responses of chiral plasmonic nanoparticles are influenced by their morphology, yet the impact of supporting substrates is significant but not fully understood. In this study, we numerically investigate the effect of high-refractive-index dielectric substrates on the chiroptical response of individual chiral plasmonic nanoparticles. Using Au helicoid as an example, we observe that as the refractive index of the supporting substrate increases, there is a remarkable enhancement in the dissymmetry factor(g-factor), along with an abnormal peak separation between the absorption and scattering g-factor spectra, which is different from typical observations. This unique chiroptical evolution is attributed to the strong plasmon hybridization under circularly polarized in-plane excitation. To validate the universality of these findings, we vary the size and material of the helicoid, confirming the consistent occurrence of this phenomenon. Our findings provide valuable insights into the substrate effect of chiral plasmonic nanoparticles to facilitate their applications in on-chip devices and sensing technologies.展开更多
Two-dimensional transition metal dichalcogenides(2D TMDCs)have received considerable attention in local strain engineering due to their extraordinary mechanical flexibility,electonic structure,and optical properties.T...Two-dimensional transition metal dichalcogenides(2D TMDCs)have received considerable attention in local strain engineering due to their extraordinary mechanical flexibility,electonic structure,and optical properties.The strain-induced out-of-plane deformations in 2D TMDCs lead to diverse excitonic behaviors and versatile modulations in optical properties,paving the way for the development of advanced quantum technologies,flexible optoelectronic materials,and straintronic devices.Research on local strain engineering on 2D TMDCs has been delved into fabrication techniques,electronic state variations,and quantum optical applications.This review begins by summarizing the state-of-the-art methods for introducing local strain into 2D TMDCs,followed by an exploration of the impact of local strain engineering on optical properties.The intriguing phenomena resulting from local strain,such as exciton funnelling and anti-funnelling,are also discussed.We then shift the focus to the application of locally strained 2D TMDCs as quantum emitters,with various strategies outlined for modulating the properties of TMDC-based quantum emitters.Finally,we discuss the remaining questions in this field and provide an outlook on the future of local strain engineering on 2D TMDCs.展开更多
The gas transport infrastructure is frequently localized in areas subjected to anthropogenic movements and strains.The potential impact of the ground movements on the gas pipeline in the aspect of its damage can be pr...The gas transport infrastructure is frequently localized in areas subjected to anthropogenic movements and strains.The potential impact of the ground movements on the gas pipeline in the aspect of its damage can be properly assessed e.g.by predicting strains,taking into account the causes of terrain movement.On the other hand,the hazard is also related to technological factors like design of the pipeline.The presented method is based on artifcial intelligence methods allowing for evaluation of probability of failure risk in gas supply pipeline sections.The Mamdani fuzzy inference was used in this study.Uncertainty of variables characterizing the resistance of the gas pipeline and predicted continuous deformations of ground surface were accounted for in the model by using triangular-shaped membership functions.Based on the surface deformations and gas pipeline resistance and the inference model one can make prediction when the gas pipeline is hazarded.There were estimated two the most hazarded parts for two pipelines.We proved that the proposed model can contribute to the protection,costoptimization of the designed pipelines and to the repairs of the existing gas pipelines.展开更多
The automatic registration of multi-source remote sensing images (RSI) is a research hotspot of remote sensing image preprocessing currently. A special automatic image registration module named the Image Autosync has ...The automatic registration of multi-source remote sensing images (RSI) is a research hotspot of remote sensing image preprocessing currently. A special automatic image registration module named the Image Autosync has been embedded into the ERDAS IMAGINE software of version 9.0 and above. The registration accuracies of the module verified for the remote sensing images obtained from different platforms or their different spatial resolution. Four tested registration experiments are discussed in this article to analyze the accuracy differences based on the remote sensing data which have different spatial resolution. The impact factors inducing the differences of registration accuracy are also analyzed.展开更多
Elongated plasmonic nanoparticles have been extensively explored over the past two decades.However,in comparison with the dipolar plasmon mode that has attracted the most interest,much less attention has been paid to ...Elongated plasmonic nanoparticles have been extensively explored over the past two decades.However,in comparison with the dipolar plasmon mode that has attracted the most interest,much less attention has been paid to multipolar plasmon modes because they are usually thought to be“dark modes”,which are unable to interact with farfield light efficiently.Herein,we report on an intriguing far-field scattering phenomenon,colour routing,based on longitudinal multipolar plasmon modes supported by high-aspect-ratio single Ag nanorods.Taking advantage of the distinct far-field behaviours of the odd and even multipolar plasmon modes,we demonstrate two types of colour routing,where the incident white light can be scattered into several beams with different colours as well as different propagation directions.Because of the narrow linewidths of the longitudinal multipolar plasmon modes,there is little spectral overlap between the adjacent peaks,giving rise to outstanding colour selectivity.Our experimental results and theoretical model provide a simple yet effective picture for understanding the far-field behaviour of the longitudinal multipolar plasmon modes and the resultant colour routing phenomenon.Moreover,the outstanding colour routing capability of the high-aspect-ratio Ag nanorods enables nanoscale optical components with simple geometries for controlling the propagation of light below the diffraction limit of light.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.62575185 and 62205223)Guangdong Basic and Applied Basic Research Foundation (Grant Nos.2023A1515110091 and 2023A1515011455)+1 种基金Department of Science and Technology of Guangdong Province(Grant Nos.2023QN10C200 and 2023QN10X082)Science and Technology Innovation Commission of Shenzhen (Grant Nos.20231121120748002 and JSGGKQTD20221101115701006)。
文摘Chiroptical responses of chiral plasmonic nanoparticles are influenced by their morphology, yet the impact of supporting substrates is significant but not fully understood. In this study, we numerically investigate the effect of high-refractive-index dielectric substrates on the chiroptical response of individual chiral plasmonic nanoparticles. Using Au helicoid as an example, we observe that as the refractive index of the supporting substrate increases, there is a remarkable enhancement in the dissymmetry factor(g-factor), along with an abnormal peak separation between the absorption and scattering g-factor spectra, which is different from typical observations. This unique chiroptical evolution is attributed to the strong plasmon hybridization under circularly polarized in-plane excitation. To validate the universality of these findings, we vary the size and material of the helicoid, confirming the consistent occurrence of this phenomenon. Our findings provide valuable insights into the substrate effect of chiral plasmonic nanoparticles to facilitate their applications in on-chip devices and sensing technologies.
基金support from National Natural Science Foundation of China(Grant Nos.62205223)Natural Science Foundation of Guangdong Province(Grant Nos.2023A1515011455)+6 种基金Science and Technology Innovation Commission of Shenzhen(Grant Nos.20231121120748002)support from Guangdong Introducing Innovative and Entrepreneurial Teams(Grant Nos.2019ZT08L101)Natural Science Foundation of Guangdong Province(Grant Nos.2023A1515110091)Science and Technology Innovation Commission of Shenzhen(Grant Nos.JSGGKQTD20221101115701006)support from National Key R&D Program of China(Grant Nos.2021YFA1401100)National Natural Science Foundation of China(Grant Nos.12104317)Scientific Instrument Developing Project of Shenzhen University(Grant Nos.2023YQ003)。
文摘Two-dimensional transition metal dichalcogenides(2D TMDCs)have received considerable attention in local strain engineering due to their extraordinary mechanical flexibility,electonic structure,and optical properties.The strain-induced out-of-plane deformations in 2D TMDCs lead to diverse excitonic behaviors and versatile modulations in optical properties,paving the way for the development of advanced quantum technologies,flexible optoelectronic materials,and straintronic devices.Research on local strain engineering on 2D TMDCs has been delved into fabrication techniques,electronic state variations,and quantum optical applications.This review begins by summarizing the state-of-the-art methods for introducing local strain into 2D TMDCs,followed by an exploration of the impact of local strain engineering on optical properties.The intriguing phenomena resulting from local strain,such as exciton funnelling and anti-funnelling,are also discussed.We then shift the focus to the application of locally strained 2D TMDCs as quantum emitters,with various strategies outlined for modulating the properties of TMDC-based quantum emitters.Finally,we discuss the remaining questions in this field and provide an outlook on the future of local strain engineering on 2D TMDCs.
基金The research reported in this paper has been supported by a grant from the National Science Centre No.2011/01/D/ST10/06958.
文摘The gas transport infrastructure is frequently localized in areas subjected to anthropogenic movements and strains.The potential impact of the ground movements on the gas pipeline in the aspect of its damage can be properly assessed e.g.by predicting strains,taking into account the causes of terrain movement.On the other hand,the hazard is also related to technological factors like design of the pipeline.The presented method is based on artifcial intelligence methods allowing for evaluation of probability of failure risk in gas supply pipeline sections.The Mamdani fuzzy inference was used in this study.Uncertainty of variables characterizing the resistance of the gas pipeline and predicted continuous deformations of ground surface were accounted for in the model by using triangular-shaped membership functions.Based on the surface deformations and gas pipeline resistance and the inference model one can make prediction when the gas pipeline is hazarded.There were estimated two the most hazarded parts for two pipelines.We proved that the proposed model can contribute to the protection,costoptimization of the designed pipelines and to the repairs of the existing gas pipelines.
文摘The automatic registration of multi-source remote sensing images (RSI) is a research hotspot of remote sensing image preprocessing currently. A special automatic image registration module named the Image Autosync has been embedded into the ERDAS IMAGINE software of version 9.0 and above. The registration accuracies of the module verified for the remote sensing images obtained from different platforms or their different spatial resolution. Four tested registration experiments are discussed in this article to analyze the accuracy differences based on the remote sensing data which have different spatial resolution. The impact factors inducing the differences of registration accuracy are also analyzed.
基金financial support from the Hong Kong Research Grants Council(General Research Fund,14306817)a joint grant between the Chinese Academy of Engineering Physics and the National Natural Science Foundation of China(NSAF,U1530401)the National Natural Science Foundation of China(91630313).
文摘Elongated plasmonic nanoparticles have been extensively explored over the past two decades.However,in comparison with the dipolar plasmon mode that has attracted the most interest,much less attention has been paid to multipolar plasmon modes because they are usually thought to be“dark modes”,which are unable to interact with farfield light efficiently.Herein,we report on an intriguing far-field scattering phenomenon,colour routing,based on longitudinal multipolar plasmon modes supported by high-aspect-ratio single Ag nanorods.Taking advantage of the distinct far-field behaviours of the odd and even multipolar plasmon modes,we demonstrate two types of colour routing,where the incident white light can be scattered into several beams with different colours as well as different propagation directions.Because of the narrow linewidths of the longitudinal multipolar plasmon modes,there is little spectral overlap between the adjacent peaks,giving rise to outstanding colour selectivity.Our experimental results and theoretical model provide a simple yet effective picture for understanding the far-field behaviour of the longitudinal multipolar plasmon modes and the resultant colour routing phenomenon.Moreover,the outstanding colour routing capability of the high-aspect-ratio Ag nanorods enables nanoscale optical components with simple geometries for controlling the propagation of light below the diffraction limit of light.
