From symmetric to asymmetric bowtie nanoantennas: electrostatic conformal mapping perspective
| Autor: | R. A. Alves, Pacheco-Peña, Miguel Navarro-Cia |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
73.20.mf
QC1-999 0205 Optical Physics Physics::Optics Conformal map 02 engineering and technology 010402 general chemistry 78.67.bf 01 natural sciences plasmonics Theoretical physics Perspective (geometry) Electrical and Electronic Engineering Plasmon Physics 1007 Nanotechnology conformal mapping 021001 nanoscience & nanotechnology 41.20.cv Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials 0906 Electrical and Electronic Engineering nanoantennas 78.90.+t 0210 nano-technology Biotechnology |
| Zdroj: | Nanophotonics, Vol 9, Iss 5, Pp 1177-1187 (2020) |
| ISSN: | 2192-8614 2192-8606 |
| Popis: | Plasmonic nanoantennas have revolutionized the way we study and modulate light–matter interaction. Due to nanofabrication limitations, dimer-type nanoantennas always exhibit some degree of asymmetry, which is desirable in some cases. For instance, in sensing applications, asymmetry is sometimes induced by design in plasmonic nanoantennas to favor higher order nonradiative modes with sharp Fano line shapes. Regardless of the actual origin of the asymmetry, unintentional or intentional, an analytical frame that can deal with it in a seamless manner would be beneficial. We resort to conformal mapping for this task and we track the influence of the degree of asymmetry of the circular sectors composing gold bowtie nanoantennas on the nonradiative Purcell enhancement of a nearby nanoemitter. This manuscript reviews the contributions of conformal mapping to plasmonic nanoantennas and illustrates the advantages of the elegant analytical solution provided by conformal mapping to grasp physical insights, which can serve as a springboard for new plasmonic asymmetric nanoantenna designs. |
| Databáze: | OpenAIRE |
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