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Quantitative measurement of spatial distribution of effective refractive index induced by local electron concentration at a nano slit.
Nanophotonics
August 2024
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Daejeon, Republic of Korea.
Article Synopsis
- Surface plasmon polaritons (SPPs) are important in sensitive biomolecular detection and optical communication technologies, but their interaction with other near-field modes like quasi-cylindrical waves (QCWs) and composite diffracted evanescent waves (CDEWs) is not fully understood.
- This study utilized a nano groove structure and a stable femtosecond laser to measure the spatial phase distribution around the edge of a nano slit, achieving a high precision measurement of refractive index changes.
- The findings provide insights into the near-field effects on electron concentration at the nano structures, enhancing the understanding of SPP phenomena which could improve the design and application of nano-plasmonic technologies.
Orbital angular momentum (OAM) existing in the vortex light beam with isolated singularities and spiral phase distribution presents significant applications in optical communications and light-field manipulation. The generation of OAM based on plasmonic metasurfaces is generally limited by the large optical loss and weak tunability of metal materials. Three-dimensional (3D) topological insulators (TIs) with insulating bulk states and topologically protected surface states allow the excitation of surface plasmons with low loss in the high-frequency region.
View Article and Find Full Text PDFA multi-feature fusion graph attention network for decoding motor imagery intention in spinal cord injury patients.
J Neural Eng
December 2024
Swartz Center for Computational Neuroscience, Institute for Neural Computation, University of California San Diego, La Jolla, CA 92093, United States of America.
Electroencephalogram (EEG) signals exhibit temporal-frequency-spatial multi-domain feature, and due to the nonplanar nature of the brain surface, the electrode distributions follow non-Euclidean topology. To fully resolve the EEG signals, this study proposes a temporal-frequency-spatial multi-domain feature fusion graph attention network (GAT) for motor imagery (MI) intention recognition in spinal cord injury (SCI) patients.The proposed model uses phase-locked value (PLV) to extract spatial phase connectivity information between EEG channels and continuous wavelet transform to extract valid EEG information in the time-frequency domain.
View Article and Find Full Text PDFGraphene Terahertz Devices for Sensing and Communication.
Small
August 2024
Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA.
Graphene-based terahertz (THz) devices have emerged as promising platforms for a variety of applications, leveraging graphene's unique optoelectronic properties. This review explores recent advancements in utilizing graphene in THz technology, focusing on two main aspects: THz molecular sensing and THz wave modulation. In molecular sensing, the environment-sensitive THz transmission and emission properties of graphene are utilized for enabling molecular adsorption detection and biomolecular sensing.
View Article and Find Full Text PDFNonlinear dynamics of planetary roller screw mechanism.
Chaos
July 2024
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China.
The synchronous meshing of the gear pair and the screw pair is a typical feature of the planetary roller screw mechanism. In order to fully derive and analyze the nonlinear dynamic characteristics of the system, this paper creatively incorporates the time-varying meshing stiffness of gear pair and the comprehensive transmission error into the research content. Combined with the thread contact force and friction force between the roller and the screw and between the roller and the nut, the nonlinear dynamic model of the planetary roller screw mechanism considering the meshing excitation of the gear pair is established.
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