Surface plasmon polariton propagation in organic nanofiber based plasmonic waveguides

Leißner, Till; Lemke, Christoph; Jauernik, Stephan; Müller, M.; Fiutowski, Jacek; Tavares, Luciana; Thilsing-Hansen, Kasper; Kjelstrup‐Hansen, Jakob; Magnussen, Olaf M.; Rubahn, Horst‐Günter; Bauer, Michael

doi:10.1364/oe.21.008251

Cited by 19 publications

(18 citation statements)

References 38 publications

(45 reference statements)

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“…Beyond the spatial imaging of the plasmonic fields, we also perform an ITR-mPEEM experiment to image evolution of the spin-momentum-locked SPPs in space and time. The movies are generated by scanning the delay between identical pump and probe pulse pairs with a Mach–Zehnder interferometer in ∼100 steps . After generation in the interferometer, the linearly polarized pulse pairs pass through the retardation plate to generate either LCP or RCP light.…”

Section: Resultsmentioning

confidence: 99%

“…Additional information to be gained from ITR-mPEEM movies is the phase and group velocities of SPPs and potentially their dephasing lengths . We do not extract the dephasing lengths, because at 460 nm they exceed dimensions of the Ag island.…”

Section: Resultsmentioning

confidence: 99%

“…The movies are generated by scanning the delay between identical pump and probe pulse pairs with a Mach−Zehnder interferometer in ∼100 steps. 55 After generation in the interferometer, the linearly polarized pulse pairs pass through the retardation plate to generate either LCP or RCP light. Snapshots from the movies in Figure 5(a−d) show 2P-PEEM images excited by the RCP light from the experiment and Huygens−Fresnel simulation at delay Δt of 0 and 27.6 fs.…”

Section: Resultsmentioning

confidence: 99%

“…Additional information to be gained from ITR-mPEEM movies is the phase and group velocities of SPPs and potentially their dephasing lengths. 55 We do not extract the dephasing lengths, because at 460 nm they exceed dimensions of the Ag island. Figure 5e plots the displacement of the second beating maximum D B of spin-momentum-locked SPPs as a function of pump−probe delay when launched from the β and β′ edges with opposite light helicities.…”

Section: Resultsmentioning

confidence: 99%

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Ultrafast Microscopy of Spin-Momentum-Locked Surface Plasmon Polaritons

et al. 2018

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Using two-photon photoemission electron microscopy (2P-PEEM) we image the polarization dependence of coupling and propagation of surface plasmon polaritons (SPPs) launched from edges of a triangular, micrometer size, single-crystalline Ag crystal by linearly or circularly polarized light. 2P-PEEM records interferences between the optical excitation field and SPPs it creates with nanofemto space-time resolution. Both the linearly and circularly polarized femtosecond light pulses excite spatially asymmetric 2PP yield distributions, which are imaged. We attribute the asymmetry for linearly polarized light to the relative alignments of the laser polarization and triangle edges, which affect the efficiency of excitation of the longitudinal component of the SPP field. For circular polarization, the asymmetry is caused by matching of the spin angular momenta (SAM) of light and the transverse SAM of SPPs. Moreover, we show that the interference patterns recorded in the 2P-PEEM images are cast by phase shifts and amplitudes for coupling of light into the longitudinal and transverse components of SPP fields. While the interference patterns depend on the excitation polarization, nanofemto movies show that the phase and group velocities of SPPs are independent of SAM of light in time-reversal invariant media. Simulations of the wave interference reproduce the polarization and spin-dependent coupling of optical pulses into SPPs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ultrafast Microscopy of Spin-Momentum-Locked Surface Plasmon Polaritons

et al. 2018

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“…Additional information to be gained from ITR-mPEEM movies is the phase and group velocities of SPPs, and potentially their dephasing lengths. [77] We do not extract the dephasing lengths, because at 460 nm they exceed the dimensions of the Ag island. The group velocity, , which is defined by the wave packet motion, cannot be determined as precisely in PEEM images due to the finite dimension the Ag island.…”

Section: Dynamics Of Spin-angular Momentum Coupled Sppsmentioning

confidence: 99%

Imaging Light with Photoelectrons on the Nano-Femto Scale

Dai¹

2020

Springer Theses

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The interaction of light with solid state quasiparticles, such as excitons and plasmons, on the nanometer-femtosecond spatio-temporal scale illuminates ultrafast physical and chemical processes on surfaces. In this thesis, I report on the generation, control, and spatio-temporal evolution of 2D evanescent electromagnetic waves confined at the silver (Ag)/vacuum interface; such fields, known as surface plasmon polaritons (SPPs), have joint particle-wave nature. SPPs are generated by the interaction of light with the collective response of conduction band freeelectrons of metals. I image and study the ultrafast dynamics of SPP fields by interferometric timeresolved multi-photon photoemission electron microscopy (ITR-mP-PEEM). First, I report on the generation and propagation of SPPs excited on epitaxially grown Ag nanocrystals. The PEEM images record an interference pattern between SPPs and vacuum light, defined by a mismatch in their propagation wave vectors. Next, I explore the light polarization as a control parameter for the SPP generation, where the in-plane and out-of-plane components of optical electric fields couple differently. For equilateral triangle Ag island samples, the SPP interference patterns strongly depend on both the linear and circular polarizations. For circularly polarized light, the SPP coupling depends on the matching between spin angular momenta (SAM) of light and SPPs. The SAM of evanescent waves like SPPs is transverse and points oppositely when the propagation wave vector is reversed; this is known as the photonic quantum spin Hall effect (QSHE). I demonstrate that QSHE affects the function of an SPP lens coupling structure through a vectorial superposition of longitudinally and transversely coupled SPP waves that are launched by TE waves v (s-polarized) and TM waves (p-polarized), respectively. Finally, I combine my understanding of SPP generation and imaging in a normal-incidence PEEM measurement to explore SPP dynamics when formed by an Archimedean spiral coupling structure. The geometrically defined phase structure of such SPP fields generates plasmonic vortices, whose singularities and time evolution are imaged by PEEM. Based on simulations, I conclude that the SPPs SAM distribution at the vortex core has a stable topological texture of a Néel type Skyrmion, and experimentally locate it by imaging the SPP field singularities.

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Spin Angular Momenta and Chirality of SPPs

Dai

2020

Imaging Light With Photoelectrons on the Nano-Femto Scale

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Surface plasmon polariton propagation in organic nanofiber based plasmonic waveguides

Cited by 19 publications

References 38 publications

Ultrafast Microscopy of Spin-Momentum-Locked Surface Plasmon Polaritons

Ultrafast Microscopy of Spin-Momentum-Locked Surface Plasmon Polaritons

Imaging Light with Photoelectrons on the Nano-Femto Scale

Spin Angular Momenta and Chirality of SPPs

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