Focusing dynamics on circular distributed tapered metallic waveguides by means of plasmonic vortex lenses

Ongarello, T.; Parisi, G.; Garoli, Denis; Mari, Elettra; Zilio, Pierfrancesco; Romanato, Filippo

doi:10.1364/ol.37.004516

Cited by 16 publications

(16 citation statements)

References 18 publications

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“…As reported in our previous paper [4] our metallic planar nanotips support plasmonic modes that can be guided and focalized up to a few nanometers [14][15][16][17][18][19]. The control of the PV modes can be used to modulate in phase the SPPs' propagation along the nanotips and their corresponding focusing dynamics.…”

Section: B Near-field Optical Characterizationmentioning

confidence: 61%

“…However, a structure working in transmission (depicted in Fig. 1) is more suitable for near-field experimental characterization, as previously illustrated [4]. In this configuration, in fact, it is possible to directly probe the near field with a NSOM tip and observing the nanofocusing effect directly from the air side of the tapered waveguides.…”

Section: A Sample Design and Fabricationmentioning

confidence: 99%

“…The exposed resist was then developed in a mixture of the standard negative resist developer AR 300-47 and deionized water (DI H 2 O) in a ratio of 4∶1 for 150 s. With respect to the design proposed in [4], we used gold in this experiment instead of silver. In fact, besides providing a much better chemical stability, gold is easier to grow by electrolytic processes.…”

Section: A Sample Design and Fabricationmentioning

confidence: 99%

“…Indeed plasmonics provides the ability to reduce the OAM transport from a 3D phenomenon, i.e., a propagating wave, to an inherently 2D one. The geometric design of a spiral-shaped grating called plasmonic vortex lens (PVL) allows the complete manipulation of the topological charge of light by means of planar nanostructures, hence, by exploiting PVs, and provides feasible ways to engineer spin-orbit interactions in order to obtain new peculiar optical effects [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Taking advantage of the versatility of a PVL as a generator of OAM at the nanoscale level, we have recently reported a theoretical investigation of a plasmonic nanostructure consisting of four planar metallic nanotips circularly distributed around the center of a PVL [4]. We have shown in particular that by means of a PVL it is possible to illuminate the nanotips with a PV, therefore controlling the dynamics of the nanofocusing effect that takes place at each nanotip by varying the topological charge imposed on the structure.…”

Section: Introductionmentioning

confidence: 99%

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Nanofocusing on circularly distributed tapered metallic waveguides by means of plasmonic vortex lenses

et al. 2015

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We report our experimental results on the nanofocusing effect at the apex of planar nanotips placed at the center of a plasmonic vortex lens (PVL). PVLs are helical gratings that are able to generate surface plasmon polaritons (SPPs) carrying orbital angular momentum. A specific design allows us to couple the PVL with nanostructures placed at its center. The proposed configuration allows a simultaneous nanofocusing effect on four facing planar nanotips, showing efficient condensation of SPPs at the metal-air interface toward the end point of the tips. An optimized fabrication process allows us to prepare high-quality structures with a sharp tip apex. Near-field scanning optical microscopy has been used to demonstrate the nanofocusing effect.

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Section: B Near-field Optical Characterizationmentioning

confidence: 61%

Section: A Sample Design and Fabricationmentioning

confidence: 99%

Section: A Sample Design and Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanofocusing on circularly distributed tapered metallic waveguides by means of plasmonic vortex lenses

et al. 2015

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Localized Plasmonic Vortex Printing Technology Based on the Metaparticle and Spoof Surface Plasmon Polaritons

Wang

Wang³

et al. 2021

Physica Status Solidi (a)

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The spiral structures have drawn much attention for optical applications in recent years. [1][2][3][4][5][6][7] Angular momentum is one of the basic properties of the light, which can be classified into spin angular momentum (SAM) [8] and orbital angular momentum (OAM). [9,10] SAM is associated with the handedness of circular polarizations and OAM is used to generate optical vortices. These SAM and OAM have brought about extensive investigation for localized and radiation vortex electromagnetic (EM) applications such as imaging, [11] data storage, [12] and high-capacity communication. [13] Recently, the possibility of producing and analyzing plasmonic vortices (PVs) led to focus on the interaction of light with metallic architectures, resulting in surface plasmon polaritons (SPPs) carrying angular momentum. [14][15][16] Typically, PVs designs are based on SPPs with Archimedean spirals (ASs) and some other structures, [17][18][19] which have been used to excite SPPs and regulate the phase information simultaneously. However, most of these SPP vortex designs are located at visible and near-infrared frequencies. In addition, at microwave frequencies, the metals behave as the perfect electric conductor (PEC) characteristics and cannot be used to support SPPs. To solve these barriers, spoof SPPs (SSPPs) may be alternative designs. [20][21][22][23][24][25] Accordingly, the concept of SSPPs has been proposed to solve these problems, which uses structured metal surfaces to confine EM modes. [26][27][28][29][30][31][32][33][34][35] As introduced in the aforementioned literatures, most of PVs structures realize topological charge of vortex EM wave are equal to þ1 or À1 and only a few works have implemented vortex waves with multiple topological charges in single structure simultaneously. [35] Fortunately, a SSPP structure with periodic holes etched on the CPW striplines was proposed in the study by Wang et al. [36] to realize a high-efficiency low-pass transmission, which provide a new design idea to realize the localized vortex EM waves with multimodal topological charges excited in single planar structure.In our research, we proposed a new method to generate localized EM vortex waves with multimodal topological charges (þ1, 0, and À1). The proposed method uses the CPW-based SSPP waveguide to excite a periodic array of metaparticles, which realizes the localized PVs printing technology. Meanwhile,

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Plasmon Nanofocusing with Negative Refraction in a High-Index Dielectric Wedge

Gramotnev¹,

Tan

Kurth

2013

Plasmonics

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Focusing dynamics on circular distributed tapered metallic waveguides by means of plasmonic vortex lenses

Cited by 16 publications

References 18 publications

Nanofocusing on circularly distributed tapered metallic waveguides by means of plasmonic vortex lenses

Nanofocusing on circularly distributed tapered metallic waveguides by means of plasmonic vortex lenses

Localized Plasmonic Vortex Printing Technology Based on the Metaparticle and Spoof Surface Plasmon Polaritons

Plasmon Nanofocusing with Negative Refraction in a High-Index Dielectric Wedge

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