High temperature, oil, air and water resistant, Letone constant pressure compressed air rubber hose are widely used in the mining and quarrying industries.The compressed air rubber hose is a high-quality product that is designed to provide reliable and efficient performance in a wide range of industrial applications. It is constructed using premium materials that are resistant to abrasion and corrosion, ensuring long-lasting durability. Compressed Air Rubber Hose,Durable Air Hose,Air Compressor Hose,Chemical Fiber Reinforced Hose Luohe Letone Hydraulic Technology Co., Ltd , https://www.litonghose.com
In the field of nanoscale research, scientists are constantly striving to develop advanced detection technologies that offer high time and spatial resolution. Under the leadership of Academician Gong Qihuang from Peking University's School of Physics, a major national scientific research instrument development project called "Femtosecond-Nano Space-Time Optical Experiment System" is focusing on exploring the nano-world with greater clarity. Recently, this significant project has achieved notable progress in multi-dimensional detection of surface plasmons using ultrafast photoelectron microscopy technology. The findings were published in the November 19, 2018 issue of *Nature Nanotechnology*, titled *"Manipulation of the dephasing time by strong coupling between localized and propagating surface plasmon modes."*
The study presents a schematic diagram of the photoelectron microscopy setup along with a multilayer structure, as shown in Figure 1(a). It also includes far-field and near-field detection curves, demonstrating the distribution of localized surface plasmon patterns under different laser excitation wavelengths.
Localized surface plasmons, which occur in metal nanoparticles, have broad applications due to their high local intensity, small scale, and sensitivity. However, their ultra-short dephasing time—on the order of femtoseconds—has limited their practical use. This research introduces a multi-layer structure that enables strong coupling between localized and propagating surface plasmons, as illustrated in Figure 1(a).
Numerical simulations further confirm the energy exchange between these two types of plasmon modes under strong coupling conditions. The photoelectron microscope directly images the surface plasmon mode in the near field, overcoming the limitations of traditional far-field detection methods. By combining different excitation sources, the system can achieve multi-dimensional analysis. When using a wavelength-tunable laser, the photoelectron microscope records the intensity evolution of the surface plasmon mode across different frequencies, as shown in Figure 1(b).
Additionally, by integrating ultrafast pump-probe techniques, the photoelectron microscopy captures the temporal evolution of the surface plasmon mode. This allows for a more detailed and intuitive understanding of the energy transfer process in strongly coupled systems. The research demonstrates that by adjusting the detuning in the coupling, the lifetime of the plasmon mode can be controlled. Compared to the uncoupled mode, the lifetime increases from 6 to 10 femtoseconds, significantly enhancing its potential for practical applications.
This breakthrough has important implications for future developments in artificial photosynthesis, biosensing, and other fields relying on surface plasmons. The study was conducted jointly by Peking University and Hokkaido University in Japan. Yang Jingwei, a Ph.D. student at Peking University, and Sun Quan, an international collaborator and assistant professor at Hokkaido University, are co-first authors of the paper. Gong Qihuang and Professor Misawa from Hokkaido University are corresponding authors.
The research was supported by several funding bodies, including the National Science and Technology Fund Committee, the Ministry of Science and Technology, the National Center for Artificial Microstructure and Mesoscopic Physics at Peking University, the Extreme Optics Collaborative Innovation Center, the "2011 Plan" Quantum Material Science Collaborative Innovation Center, and the Nanotechnology Platform at Hokkaido University.
Currently, the "Femtosecond-Nano Space-Time Optical Experiment System" is progressing smoothly, with multiple achievements already realized. The core instrument of the system is a low-energy photoelectron microscope (PEEM) capable of operating across a wide range of wavelengths—from extreme ultraviolet to near-infrared. In the future, this system is expected to play a key role in research areas such as two-dimensional materials, photovoltaic devices, and surface mesoscopic physics.
(Original title: *Extreme Optical Innovation Research Team "Femtosecond-Nano Space-Time Discrete Optical Experiment System" National Major Scientific Research Instrument Development Project Has Made Important Progress*)