Plasmonic versus All-Dielectric Nanoantennas for Refractometric Sensing: A Direct Comparison
| Autor: | Tomasz J. Antosiewicz, Nils Odebo Länk, Noemi Bosio, Mikael Käll, Hana Šípová-Jungová, Ruggero Verre |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Nanophotonics 02 engineering and technology Dielectric Photothermal therapy 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics 0103 physical sciences Optoelectronics Sensitivity (control systems) Electrical and Electronic Engineering Antenna (radio) 0210 nano-technology business Refractive index Ohmic contact Plasmon Biotechnology |
| Zdroj: | ACS Photonics. 6:1556-1564 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.9b00434 |
| Popis: | In comparison to nanoplasmonic structures, resonant high-index dielectric nanoantennas hold several advantages that may benefit nanophotonic applications, including CMOS compatibility and low ohmic losses. One such application area might be label-free refractometric sensing, where changes in individual antenna resonance properties are used to quantify changes in the surrounding refractive index, for example, due to biomolecular binding. Here, we analyze and compare the sensing performance of silicon and gold nanodisks using a common and unbiased testing framework. We find that the all-dielectric system is fully capable of effectively monitoring small changes in bulk refractive index and biomolecular coverage, but the sensitivity is five to ten times lower than the plasmonic counterpart. However, this drawback is partly compensated for by a more linear response to adsorbate layer thickness changes and an approximately four times smaller susceptibility to photothermal heating. Finally, dielectric sensors may show promise if certain strategies are employed to improve their performance, which could thus bridge the gap between the two systems. |
| Databáze: | OpenAIRE |
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