A 3D Plasmonic Antenna-Reactor for Nanoscale Thermal Hotspots and Gradients
| Autor: | Jordin Metz, Jian Yang, Peter Nordlander, Yage Zhao, Pratiksha D. Dongare, Oara Neumann, David Renard, Alessandro Alabastri, Lin Yuan, Naomi J. Halas |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Nanostructure Materials science business.industry General Engineering Physics::Optics General Physics and Astronomy 02 engineering and technology Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Thermal conductivity Thermal Optoelectronics General Materials Science Antenna (radio) 0210 nano-technology Absorption (electromagnetic radiation) business Plasmon |
| Zdroj: | ACS Nano. 15:8761-8769 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.1c01046 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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