Dark-Field Scattering and Local SERS Mapping from Plasmonic Aluminum Bowtie Antenna Array

Dao, Thang Duy; Hoang, Chung Vu; Nishio, Natsuki; Yamamoto, Naoki; Ohi, Akihiko; Nabatame, Toshihide; Aono, Masakazu; Nagao, Tadaaki

doi:10.3390/mi10070468

Cited by 9 publications

(9 citation statements)

References 59 publications

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“…The complex consists of a carefully tuned Au bowtie nanoantenna and a small Au nanorod reactor fabricated within its junction. Metallic bowties or alternative plasmonic material , nanostructures can act as antennas for coupling with propagating fields, localizing electromagnetic energy . In the past decade, bowties or related geometries have been engineered for multiple applications, including optical tweezers, gas-sensing, optical trapping, and even magnetic data storage or audio recording .…”

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confidence: 99%

A 3D Plasmonic Antenna-Reactor for Nanoscale Thermal Hotspots and Gradients

et al. 2021

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Plasmonic nanoantennas focus light below the diffraction limit, creating strong field enhancements, typically within a nanoscale junction. Placing a nanostructure within the junction can greatly enhance the nanostructure’s innate optical absorption, resulting in intense photothermal heating that could ultimately compromise both the nanostructure and the nanoantenna. Here, we demonstrate a three-dimensional “antenna-reactor” geometry that results in large nanoscale thermal gradients, inducing large local temperature increases in the confined nanostructure reactor while minimizing the temperature increase of the surrounding antenna. The nanostructure is supported on an insulating substrate within the antenna gap, while the antenna maintains direct contact with an underlying thermal conductor. Elevated local temperatures are quantified, and high local temperature gradients that thermally reshape only the internal reactor element within each antenna-reactor structure are observed. We also show that high local temperature increases of nominally 200 °C are achievable within antenna-reactors patterned into large extended arrays. This simple strategy can facilitate standoff optical generation of high-temperature hotspots, which may be useful in applications such as small-volume, high-throughput chemical processes, where reaction efficiencies depend exponentially on local temperature.

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confidence: 99%

A 3D Plasmonic Antenna-Reactor for Nanoscale Thermal Hotspots and Gradients

et al. 2021

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“…This method does not directly reveal possible changes of plasmon modes, because the localized strong near-fields from the plasmonic resonances in junctions are only one of the factors responsible for the enhancement effects in SERS 52 . However, SERS consistently shows its highest magnitude when the incident light is polarized along the nanogap (longitudinal) involving NP dimers 198 , bow-tie nanoantennas 199 , point-point junctions (MCBJs 195 or EBJs 200 ) and pointplane junctions (NPoMJs 201 and STM-BJs 202 ). A stronger field enhancement in transverse polarization has been recently observed in nanoparticle-based point-point junctions 203,204 and EBJs 205,206 (fig.…”

Section: Point-point Junctionsmentioning

confidence: 99%

Plasmonic phenomena in molecular junctions: principles and applications

Wang

Ojambati

et al. 2022

Nat Rev Chem

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Molecular junctions are building blocks for constructing future nanoelectronic devices that enable the investigation of a broad range of electronic transport properties within nanoscale regions. Crossing both the nanoscopic and mesoscopic length scales, plasmonics lies at the intersection of the macroscopic photonics and nanoelectronics, owing to their capability of confining light to dimensions far below the diffraction limit. Research activities on plasmonic phenomena in molecular electronics started around 2010, and feedback between plasmons and molecular junctions has increased over the past years. These efforts can provide new insights into the near-field interaction and the corresponding tunability in properties, as well as resultant plasmon-based molecular devices. This Review presents the latest advancements of plasmonic resonances in molecular junctions and details the progress in plasmon excitation and plasmon coupling. We also highlight emerging experimental approaches to unravel the mechanisms behind the various types of light-matter interactions at molecular length scales, where quantum effects come into play. Finally, we discuss the potential of these plasmonic-electronic hybrid systems across various future applications, including sensing, photocatalysis, molecular trapping and active control of molecular switches.

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“…Wavelength range of 200-800 nm was selected for the plasmon resonance studies here. However, many studies and applications based on aluminum (Al) BNAs were expanded to the visible region of the EM spectrum [30,37,38]. Nonetheless, this study of bowtie-based Al plasmonic nanocomplex utilized the wavelength range of 300-800 nm, because the solar irradiance is most prominent in this range [32].…”

Section: S31 Plasmon Resonance Analysismentioning

confidence: 99%

Using Novel Bowtiebased Plasmonic Metal Nanoparticle Complexes to Enhance the Opto-electronic Performance of Thin-Film Solar Cells: supplementary document - 5229074.pdf

Shaky,

Chowdhury

2021

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Dark-Field Scattering and Local SERS Mapping from Plasmonic Aluminum Bowtie Antenna Array

Cited by 9 publications

References 59 publications

A 3D Plasmonic Antenna-Reactor for Nanoscale Thermal Hotspots and Gradients

A 3D Plasmonic Antenna-Reactor for Nanoscale Thermal Hotspots and Gradients

Plasmonic phenomena in molecular junctions: principles and applications

Using Novel Bowtiebased Plasmonic Metal Nanoparticle Complexes to Enhance the Opto-electronic Performance of Thin-Film Solar Cells: supplementary document - 5229074.pdf

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