Analysis of the Effects of Conductivity on Small Antenna Characteristics

Berro, Rana; Bories, Serge; Delaveaud, Christophe

doi:10.1109/iwat48004.2020.1570609894

“…The data suggest that the larger observed SERS enhancement from single-crystal antenna can be attributed to the quality of the Au film from which the devices were fabricated and that single-crystal nanostructures support larger near-field gap intensities than their polycrystalline counterparts, suggesting significant advantages in the use of single-crystal plasmonic materials. Performance improvement and antenna efficiency are expected to result in part from device material conductivity, 37,38 reducing conduction losses as the captured field of incident photons is directed toward the antenna feedpoint. At optical frequencies, ohmic losses occur in close proximity to the surface and therefore material quality and conductivity of the metal plays a critical role in determining device impedance.…”

Section: Plasmonic Activity and Field Enhancementmentioning

confidence: 99%

High-Performance, Single-Crystal Gold Bowtie Nano-Antennas via Epitaxial Electroless Deposition

Grayli

¹

,

Kamal

²

,

Leach

³

2021

Preprint

0

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Material quality can play a critical role in the performance of nanometer-scale plasmonic structures. Here, we highlight a novel deposition strategy for single-crystal noble metal deposition and provide a direct and quantitative comparison between the fabrication yield, durability, and efficiency of bowtie nano-antennas fabricated from monocrystalline and polycrystalline gold films using subtractive nanofabrication. Focused ion beam milling of monocrystalline Au(100) films deposited through epitaxial electroless deposition to form bowtie nano-antennas produces devices that demonstrate key performance enhancements over devices patterned identically from polycrystalline Au films deposited via physical vapor deposition. Single-crystal bowties reveal significant improvements in pattern transfer fidelity and device yield, the ability to tailor and model local plasmonic field enhancements and marked improvement in their thermal and mechanical stability over those fabricated from polycrystalline Au films. This work underscores the performance advantages of single-crystal nanoscale plasmonic materials and describes a straightforward, solution-phase deposition pathway to achieve them. We anticipate that this approach will be broadly useful in applications where local near-fields can enhance light−matter interactions, including for the fabrication of optical sensors, photocatalytic structures, hot carrier-based devices, and nanostructured noble metal architectures targeting nano-attophysics.

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High performance, single crystal gold bowtie nanoantennas fabricated via epitaxial electroless deposition

V. Grayli,

Kamal,

Leach

2023

Sci Rep

2

0

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Material quality plays a critical role in the performance of nanometer-scale plasmonic structures and represents a significant hurdle to large-scale device integration. Progress has been hindered by the challenges of realizing scalable, high quality, ultrasmooth metal deposition strategies, and by the poor pattern transfer and device fabrication yields characteristic of most metal deposition approaches which yield polycrystalline metal structure. Here we highlight a novel and scalable electrochemical method to deposit ultrasmooth, single-crystal (100) gold and to fabricate a series of bowtie nanoantennas through subtractive nanopatterning. We investigate some of the less well-explored design and performance characteristics of these single-crystal nanoantennas in relation to their polycrystalline counterparts, including pattern transfer and device yield, polarization response, gap-field magnitude, and the ability to model accurately the antenna local field response. Our results underscore the performance advantages of single-crystal nanoscale plasmonic materials and provide insight into their use for large-scale manufacturing of plasmon-based devices. We anticipate that this approach will be broadly useful in applications where local near-fields can enhance light–matter interactions, including for the fabrication of optical sensors, photocatalytic structures, hot carrier-based devices, and nanostructured noble metal architectures targeting nano-attophysics.

show abstract

High-Performance, Single-Crystal Gold Bowtie Nano-Antennas via Epitaxial Electroless Deposition

Grayli

¹

,

Kamal

²

,

Leach

³

2021

Preprint

0

View full text Add to dashboard Cite

Material quality can play a critical role in the performance of nanometer-scale plasmonic structures. Here, we highlight a novel deposition strategy for single-crystal noble metal deposition and provide a direct and quantitative comparison between the fabrication yield, durability, and efficiency of bowtie nano-antennas fabricated from monocrystalline and polycrystalline gold films using subtractive nanofabrication. Focused ion beam milling of monocrystalline Au(100) films deposited through epitaxial electroless deposition to form bowtie nano-antennas produces devices that demonstrate key performance enhancements over devices patterned identically from polycrystalline Au films deposited via physical vapor deposition. Single-crystal bowties reveal significant improvements in pattern transfer fidelity and device yield, the ability to tailor and model local plasmonic field enhancements and marked improvement in their thermal and mechanical stability over those fabricated from polycrystalline Au films. This work underscores the performance advantages of single-crystal nanoscale plasmonic materials and describes a straightforward, solution-phase deposition pathway to achieve them. We anticipate that this approach will be broadly useful in applications where local near-fields can enhance light−matter interactions, including for the fabrication of optical sensors, photocatalytic structures, hot carrier-based devices, and nanostructured noble metal architectures targeting nano-attophysics.

show abstract

Analysis of the Effects of Conductivity on Small Antenna Characteristics

Cited by 3 publications

References 8 publications

High-Performance, Single-Crystal Gold Bowtie Nano-Antennas via Epitaxial Electroless Deposition

High-Performance, Single-Crystal Gold Bowtie Nano-Antennas via Epitaxial Electroless Deposition

High performance, single crystal gold bowtie nanoantennas fabricated via epitaxial electroless deposition

High-Performance, Single-Crystal Gold Bowtie Nano-Antennas via Epitaxial Electroless Deposition

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