A spiral plasmonic lens with directional excitation of surface plasmons

Guo, Qingrui; Zhang, Chi; Hu, Xinhua

doi:10.1038/srep32345

Cited by 15 publications

(11 citation statements)

References 28 publications

(45 reference statements)

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“…Generally speaking, there are still some other types of Archimedean structures that have been published in recent years, such as rectangular slits array [ 66 , 67 ], a graphene-coated spiral dielectric lens [ 68 , 69 ] and the metallic slit with an auxiliary groove [ 70 ], which can function in different applications, such as plasmonic wave manipulation with different propagating directions and plasmonic focusing characteristics. Anyway, by using nano-aperture-based spiral structures, the excited SPP waves can be unidirectionally controlled under different CPL incidences, which provides new paths for manipulating the circular polarization states that can be used as the CPL analyzer and the OAM generator.…”

Section: Discussionmentioning

confidence: 99%

Review of the Functions of Archimedes’ Spiral Metallic Nanostructures

Guo

Zhang

et al. 2017

Nanomaterials

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Here, we have reviewed some typical plasmonic structures based on Archimedes’ spiral (AS) architectures, which can produce polarization-sensitive focusing phenomenon and generate plasmonic vortices (PVs) carrying controllable orbital angular momentum (OAM) because of the relation between the incident polarized states and the chiralities of the spiral structures. These features can be used to analyze different circular polarization states, which has been one of the rapidly developing researching topics in nanophotonics in recent years. Many investigations demonstrate that the multifunctional spiral-based plasmonic structures are excellent choices for chiral selection and generating the transmitted field with well-defined OAM. The circular polarization extinction ratio, as an evaluation criterion for the polarization selectivity of a designed structure, could be effectively improved by properly modulating the parameters of spiral structures. Such functional spiral plasmonic nanostructures are promising for applications in analyzing circular polarization light, full Stokes vector polarimetric sensors, near-field imaging, and so on.

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Section: Discussionmentioning

confidence: 99%

Review of the Functions of Archimedes’ Spiral Metallic Nanostructures

Guo

Zhang

et al. 2017

Nanomaterials

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“…In addition to SPPs vortex generation with circularly polarized light, excitations using linearly polarized light at AS coupling structures have been reported to focus SPP waves, for AS structure with low geometric charge m=1 or 2, where the effect of the phase engineering by the AS coupling structure is evident. [97,98] In this section, I show both numerically and experimentally that AS coupling structure with m=2 excited by linearly polarized light generates a plasmon vortex that is purely dependent on the geometric charge, i.e. without the external SAM.…”

Section: Field Evolution Of Spps Vortex Excited By Linearly Polarizedmentioning

confidence: 97%

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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“…Scattering of SPPs on the inhomogeneities of various configurations at the boundary between the dielectric and metal leads to enrichment of the mode composition of the SPPs, as well as to the interconnection of modes in microwave guides and microcavities, and to radiation from the metal and dielectric interface of bulk electromagnetic waves. In this field of research a large volume of theoretical and experimental works are devoted to scattering of the SPPs on various inhomogeneities in the metal layers [11][12][13][14], to focusing and controlling the SPPs by electromagnetic fields, and to various dielectric and metallic nanostructures on a chips and plasmon lenses [15][16][17][18][19][20][21][22][23][24][25][26]. Figure 1: Generation of the SPPs in the metal layer according to the Kretchmann scheme, and reflection of the SPPs from the boundary of permittivity inhomogeneity in the layer: is the angle between the tangent to the boundary of the inhomogeneity and the transverse axis .…”

Section: Kne Energy and Physicsmentioning

confidence: 99%