Geometry-induced enhancement factor improvement in covered-gold-nanorod-dimer antennas
| Autor: | MarÃa L. Pedano, Iván A. Ramos, L. M. León Hilario, Andres A. Reynoso |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Electromagnetic field
Materials science Physics - Instrumentation and Detectors General Chemical Engineering FOS: Physical sciences 02 engineering and technology 010402 general chemistry 01 natural sciences symbols.namesake Physics - Chemical Physics Figure of merit Molecule Electrical measurements purl.org/pe-repo/ocde/ford#1.03.03 [http] Spectroscopy Chemical Physics (physics.chem-ph) business.industry Instrumentation and Detectors (physics.ins-det) General Chemistry Computational Physics (physics.comp-ph) 021001 nanoscience & nanotechnology Surface plasmon polariton 0104 chemical sciences symbols Optoelectronics Nanorod 0210 nano-technology Raman spectroscopy business Physics - Computational Physics Optics (physics.optics) Physics - Optics |
| Zdroj: | CONCYTEC-Institucional Consejo Nacional de Ciencia Tecnología e Innovación Tecnológica instacron:CONCYTEC |
| Popis: | Illuminated gapped-gold-nanorod dimers hold surface plasmon polaritons (SPPs) that can be engineered, by an appropriate choice of geometrical parameters, to enhance the electromagnetic field at the gap, allowing applications in molecular detection via surface-enhanced Raman spectroscopy (SERS). Envisioning hybrid devices in which the SERS spectroscopy of molecules in the gap is complemented by electrical measurements, it arises the question of designing efficient geometries to contact the nanorods without decreasing the enhancement factor (EF) of the nanoantenna, i.e., the figure of merit for SERS spectroscopy. Within this framework we theoretically study the feasibility to fabricate designs based on covering with gold the far-from-the-gap areas of the dimer. We show that by tuning the geometrical parameters of the designs these systems can reach enhancement factors larger than the best achieved in the uncovered dimer: this supremacy survives even in the presence of dimer asymmetries and vacancies at the interfaces between the nanorods and the covering layers. Our results show that geometrical modifications away from the gap can improve the optical response at the gap, thus enabling the use of these devices both for hybrid and optical applications. 10 pages, 8 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|