Photoemission electron microscopy of localized surface plasmons in silver nanostructures at telecommunication wavelengths

Mårsell, Erik; Larsen, Esben W.; Arnold, Cord L.; Xu, Hongxing; Mauritsson, Johan; Mikkelsen, Anders

doi:10.1063/1.4913310

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…However, drawback of this method is that the deposition of alkali metal will lead the sample difficult to be applied for potential practical application since it undoubtedly will limit the reusability of the sample once exposed to air due to the highly reactivity of alkali metal [41], and it is not suitable for imaging localized surface plasmons supported by nanostructures due to uneven distribution of the deposited alkali metal on nanoscale. Moreover, plasmonic research is expanding from visible, near-infrared to optical communication waveband and even to THz spectra, the photoelectrons created by those lower energy photons will still suffer from a highorder nonlinear photoemission process even though alkali metal is applied [42][43][44]. Therefore, comprehensive reveal of the plasmonic field distribution in PEEM image without the introduction of additional material on the sample surface is desired.…”

Section: Introductionmentioning

confidence: 99%

Two-color multiphoton emission for comprehensive reveal of ultrafast plasmonic field distribution

Song

Dou

et al. 2018

New J. Phys.

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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 onecolor 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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Section: Introductionmentioning

confidence: 99%

Two-color multiphoton emission for comprehensive reveal of ultrafast plasmonic field distribution

Song

Dou

et al. 2018

New J. Phys.

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“…For example, beyond excitation in the visible regime, light in the telecommunication wavelengths (1550 nm) has been employed for multi-photon photoemission for the study of plasmonic responses in silver nanoparticles. [173] This offers new ways of looking at plasmonic responses with strong field excitation, possibly in the regime that is beyond the perturbative description. Therefore, using the output from OPA and NOPA as a pump source for ultrafast PEEM experiments, one can expect the exploration of a broad range of excited state physics, ranging from low energy excitations such as magnons and phonons in topological materials and superconductors, to high energy excitations such as plasmons, excitons, and other light-matter hybrid modes in metals and semiconductors.…”

Section: Tunable Light Sources By Parametric Amplifiersmentioning

confidence: 99%

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Dai 戴

2024

Chinese Phys. B

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Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research. It aims to unravel the intricate processes involving the excitations, interactions, and annihilations of quasi- and many-body particles, and ultimately to achieve the manipulation and engineering of exotic non-equilibrium quantum phases on the ultrasmall and ultrafast spatiotemporal scales. Given the inherent complexities arising from many-body dynamics, it therefore seeks for a technique that has efficient and diverse detection degrees of freedoms to study the underlying physics. By combining high-power femtosecond lasers with real- or momentum-space photoemission electron microscopy (PEEM), imaging excited state phenomena from multiple perspectives, including time, real space, energy, momentum, and spin, can be conveniently achieved, making it a unique technique in studying physics out of equilibrium. In this context, we overview the working principle and technical advances of the PEEM apparatus and the related laser systems, and survey key excited-state phenomena probed through this surface-sensitive methodology, including the ultrafast dynamics of electrons, excitons, plasmons, and spins etc., in materials ranging from bulk and nano-structured metals and semiconductors to low dimensional quantum materials. Through this review, one can further envision that time-resolved PEEM will open new avenues for investigating a variety of classical and quantum phenomena in a multidimensional parameter space, offering unprecedented and comprehensive insights to important questions in the field of condensed matter physics.

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Annular beam high-intensity X-ray diffraction based on an ellipsoidal single-bounce monocapillary

Liu

Sun

2016

J Appl Cryst

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This short communication presents a study of the use of an annular X-ray beam produced by an ellipsoidal single-bounce monocapillary (ESBC) to perform focal construct geometry (FCG) high-intensity angular-dispersive X-ray diffraction (ADXRD) in transmission mode. The ESBC optic effectively focused a large focal spot X-ray source into a smaller focal spot and produced a narrowed X-ray ring in the far-field pattern when combined with a beam stop. A CCD imaging detector was linearly translated along the principal axis of the ESBC-FCG and obtained the corresponding sequential images of diffraction concentric circular caustics and convergence points, which were formed by the constructive interference of a continuous set of Debye cones arising from the annular interrogation volume. Pixels from the central region of an approximately 0.6 mm 2 area were interrogated on each sequential image; as a result, a one-dimensional diffractogram of an aluminium oxide sample was revealed. The presented ESBC-FCG ADXRD technique shows potential for increasing the diffracted intensity and streamlining the operation of crystallographic analysis. Figure 1Schematic drawing illustrating the X-ray optical path of an ellipsoidal single-bounce capillary combined with a beam stop. The produced annular X-ray beam (ring footprint) is normally incident on a planar polycrystalline sample, and a CCD detector is employed to capture diffraction images along the symmetry axis.

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Photoemission electron microscopy of localized surface plasmons in silver nanostructures at telecommunication wavelengths

Abstract: We image the field enhancement at Ag nanostructures using femtosecond laser pulses with a center wavelength of 1.55 micrometer. Imaging is based on non-linear photoemission

Cited by 5 publications

References 46 publications

Two-color multiphoton emission for comprehensive reveal of ultrafast plasmonic field distribution

Two-color multiphoton emission for comprehensive reveal of ultrafast plasmonic field distribution

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Annular beam high-intensity X-ray diffraction based on an ellipsoidal single-bounce monocapillary

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