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- W3083722675 abstract "To summarize, I have employed interferometric time-resolved multi-photon photoemission microscopy, combined with wavelength tunable femtosecond lasers, to study the amplitudes, phases, spins and dynamics of surface plasmon polariton fields at various nano/micro-structures ranging from epitaxially grown silver wires/islands to structured Archimedean spirals. I conclude that light of various polarizations can couple into SPP mode in two ways; when the electric field is oscillating in the surface normal direction, it couples into the transverse SPP mode, whereas when it is oscillating in the surface plane and perpendicular to the coupling edge, it couples into the longitudinal SPP mode. The coupling of two modes together can explain the general SPP excitation mechanisms, such as the SAM dependent SPPs coupling, where the plasmonic quantum spin Hall effect arises from the superposition of transversely and longitudinally coupled SPPs. In addition, the SPPs dynamics associated with differently polarized excitation light remains time-reversal symmetric in a medium, such as Ag. Next, I described the normal-incident light PEEM measurements, where I can illuminate sample surfaces with a defined phase front, to study the plasmonic vortex generation. By imaging the dynamics of the SPP waves launched from Archimedean spiral structures with both the circularly and linearly polarized light, I found that the SAM of light is not necessary to impart OAM to SPP wave fronts. The Archimedean spiral structures can be constructed with geometric charge so that the formed SPP waves still form a vortex without supplying the external SAM of light. Finally, based on numerical simulations, I found that associated with the plasmonic vortices there is a novel Bosonic quasiparticle, an optical spin Skyrmion, which is topologically stable over pulse excitation. This discovery opens a new field of ultrafast topological plasmonics that can be investigated by future generations of students." @default.
- W3083722675 created "2020-09-11" @default.
- W3083722675 creator A5036401795 @default.
- W3083722675 date "2020-01-01" @default.
- W3083722675 modified "2023-10-18" @default.
- W3083722675 title "Summary and Perspectives" @default.
- W3083722675 doi "https://doi.org/10.1007/978-3-030-52836-2_7" @default.
- W3083722675 hasPublicationYear "2020" @default.
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