13 Papers
27 Citations
Yinping Dou is an academic researcher from Changchun University of Science and Technology. The author has contributed to research in topics: Plasmon & Laser. The author has an hindex of 4, co-authored 6 publications.
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Papers
Two-color multiphoton emission for comprehensive reveal of ultrafast plasmonic field distribution
Abstract: We experimentally demonstrate comprehensive reveal of the ultrafast plasmonic field distribution in a bowtie nanostructure by two-color photoemission electron microscopy (PEEM). We attribute the comprehensive reveal of the field distribution to an effective opening of the two-color quantum channel in multiphoton photoemission, which leads to a dramatic reduction of the nonlinear order (from 4.07 down to 2.01) of the plasmon-assisted photoelectrons and a huge increment of the photoemission yields (typically 20-fold enhancement). Furthermore, we have found that opening extent of the quantum channel strongly related with the photoemission yields generated from one-color 400 and 800 nm laser pulse illumination, and the optimized ratio between the yields for effective opening of two-color quantum channel in our experiment is also achieved. Additionally, benefiting from the high spatial resolution of PEEM, we found there exists a large difference in the nonlinear order of two-color photoemission under the plasmonic excitation within a nanostructure, which has not been reported yet. This work introduces multicolor quantum channel photoemission into the PEEM imaging and offers new way to flexibly control the nonlinear order of the plasmon-assisted photoemission, and it will enable PEEM as a versatile tool in many potential applications.
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The chemical adsorption effect of surface enhanced Raman spectroscopy of nitrobenzene and aniline using the density functional theory.
TL;DR: In this article , the performance of the Nitrobenzene and Aniline single molecules and their complexes with gold nanoparticles were studied theoretically by Raman spectroscopy, the surface-enhanced Raman Spectroscopy (SERS) and the density functional theory (DFT) simulations.
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Ultrafast switching of photoemission electron through quantum pathways interference in metallic nanostructure
TL;DR: The demonstrated femtosecond timing, nanometric spatial switching of multiphoton photoemission results from the interference of quantum pathways shows that the quantum pathway interference mechanism applies to control all the liberated electrons.
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Spatial- and energy-resolved photoemission electron from plasmonic nanoparticles in multiphoton regime.
TL;DR: It is the first time that the emergence of high kinetic energy photoelectron in weak field region around 'hot spot' is observed, attributed to the drifting of the liberated electron from plasmonic hot spot and driven by the gradient of plAsmonic field.
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Disclosing dark mode of femtosecond plasmon with photoemission electron microscopy
Abstract: The plasmonics dark mode of metal nanorings has potential in the field of e.g. sensing and surface-enhanced Raman spectroscopy (SERS). Most of the investigations on the plasmonics dark mode in a nanoring have been on far-field spectroscopy or near field simulations so far. In this paper, the near-field distribution of the femtosecond dark mode plasmon on an individual gold nanoring is mapped non-invasively using photoemission electron microscopy (PEEM). The experimental results show that strong electron emission distributions in the PEEM images under different polarization directions and wavelengths of femtosecond light are in qualitative agreement with the pattern of quadruple plasmon mode calculated using finite-difference time-domain simulation. In the meantime, it is found that there is a discrepancy in hot spot distribution between the observed PEEM image and the simulated photoelectron emission pattern, which is attributed to some possible factors, such as band structure near the Fermi level of the nanoring material and the temporal profile of femtosecond laser pulse. Real-space near-field imaging of the plasmonics dark mode provides a fundamental understanding of the near field and paves the way for further advancing the applications of dark mode in the field of e.g. sensing and SERS.
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