Design and numerical optimization of an easy-to-fabricate photon-to-plasmon coupler for quantum plasmonics

Kewes, Günter; Schell, Andreas W.; Henze, Rico; Schönfeld, Rolf Simon; Burger, Sven; Busch, Kurt; Benson, Oliver

doi:10.1063/1.4790824

Cited by 12 publications

(13 citation statements)

References 33 publications

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“…The surrounding materials shape the mode pattern of plasmonic resonances or guided modes 17 , affecting the field localization as well as damping rates. Also for coupling to integrated dielectric structures, e.g., via directional coupling 25 or special plasmon-photon transducers 26 a high accuracy is mandatory. A promising method to reach this goal of precise distance control is a well-defined coating around the metallic nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Silver nanowires with optimized silica coating as versatile plasmonic resonators

Rothe

Zhao

Kewes

et al. 2019

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Metal nanoparticles are the most frequently used nanostructures in plasmonics. However, besides nanoparticles, metal nanowires feature several advantages for applications. Their elongation offers a larger interaction volume, their resonances can reach higher quality factors, and their mode structure provides better coupling into integrated hybrid dielectric-plasmonic circuits. It is crucial though, to control the distance of the wire to a supporting substrate, to another metal layer or to active materials with sub-nanometer precision. A dielectric coating can be utilized for distance control, but it must not degrade the plasmonic properties. In this paper, we introduce a controlled synthesis and coating approach for silver nanowires to fulfill these demands. We synthesize and characterize silver nanowires of around 70 nm in diameter. These nanowires are coated with nm-sized silica shells using a modified Stöber method to achieve a homogeneous and smooth surface quality. We use transmission electron microscopy, dark-field microscopy and electron-energy loss spectroscopy to study morphology and plasmonic resonances of individual nanowires and quantify the influence of the silica coating. Thorough numerical simulations support the experimental findings showing that the coating does not deteriorate the plasmonic properties and thus introduce silver nanowires as usable building blocks for integrated hybrid plasmonic systems.

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Section: Introductionmentioning

confidence: 99%

Silver nanowires with optimized silica coating as versatile plasmonic resonators

Rothe

Zhao

Kewes

et al. 2019

Sci Rep

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“…Moreover, an earlier optimized photon-to-plasmon transducer geometry (see ref. 23 ) allows for very high single mode conversion. Finally, the excited SPP is supposed to interact strongly with a closely positioned emitter.…”

Section: Resultsmentioning

confidence: 99%

A realistic fabrication and design concept for quantum gates based on single emitters integrated in plasmonic-dielectric waveguide structures

Kewes

Schoengen

Neitzke

et al. 2016

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Tremendous enhancement of light-matter interaction in plasmonic-dielectric hybrid devices allows for non-linearities at the level of single emitters and few photons, such as single photon transistors. However, constructing integrated components for such devices is technologically extremely challenging. We tackle this task by lithographically fabricating an on-chip plasmonic waveguide-structure connected to far-field in- and out-coupling ports via low-loss dielectric waveguides. We precisely describe our lithographic approach and characterize the fabricated integrated chip. We find excellent agreement with rigorous numerical simulations. Based on these findings we perform a numerical optimization and calculate concrete numbers for a plasmonic single-photon transistor.

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“…Recently, our FEM Maxwell solver (JCMsuite) has been applied for various tasks in optics design. Among these are the design of microstructured fibers, 6, 7 solar cells, 8 microlithography masks, 9 integrated microlenses, 10 metamaterials, 11 microcavities, 12,13 plasmonic waveguides, 14 scatterometry reference standards, 15 and others. 16 Here, we discuss a method for improvement of numerical performance, so-called hp-FEM.…”

Section: Introductionmentioning

confidence: 99%

Hp-finite-elements for simulating electromagnetic fields in optical devices with rough textures

et al. 2015

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The finite-element method is a preferred numerical method when electromagnetic fields at high accuracy are to be computed in nano-optics design. Here, we demonstrate a finite-element method using hp-adaptivity on tetrahedral meshes for computation of electromagnetic fields in a device with rough textures. The method allows for efficient computations on meshes with strong variations in element sizes. This enables to use precise geometry resolution of the rough textures. Convergence to highly accurate results is observed.

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Design and numerical optimization of an easy-to-fabricate photon-to-plasmon coupler for quantum plasmonics

Cited by 12 publications

References 33 publications

Silver nanowires with optimized silica coating as versatile plasmonic resonators

Silver nanowires with optimized silica coating as versatile plasmonic resonators

A realistic fabrication and design concept for quantum gates based on single emitters integrated in plasmonic-dielectric waveguide structures

Hp-finite-elements for simulating electromagnetic fields in optical devices with rough textures

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