Impact of Surface Roughness in Nanogap Plasmonic Systems
| Autor: | Ferran Vidal-Codina, Daehan Yoo, David R. Smith, Jaime Peraire, Cristian Ciracì, Sang Hyun Oh |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics business.industry FOS: Physical sciences 02 engineering and technology Computational Physics (physics.comp-ph) 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Surface roughness Optoelectronics Nanometre Electrical and Electronic Engineering 0210 nano-technology business Physics - Computational Physics Plasmon Optics (physics.optics) Physics - Optics Biotechnology |
| Zdroj: | arXiv |
| ISSN: | 2330-4022 |
| Popis: | © 2020 American Chemical Society. Recent results have shown unprecedented control over separation distances between two metallic elements hundreds of nanometers in size, underlying the effects of free-electron nonlocal response also at mid-infrared wavelengths. Most of metallic systems, however, still suffer from some degree of inhomogeneity due to fabrication-induced surface roughness. Nanoscale roughness in such systems might hinder the understanding of the role of microscopic interactions. Here we investigate the effect of surface roughness in coaxial nanoapertures resonating at mid-infrared frequencies. We show that, although random roughness shifts the resonances in an unpredictable way, the impact of nonlocal effects can still be clearly observed. Roughness-induced perturbation on the peak resonance of the system shows a strong correlation with the effective gap size of the individual samples. Fluctuations due to fabrication imperfections then can be suppressed by performing measurements on structure ensembles in which averaging over a large number of samples provides a precise measure of the ideal system's optical properties. |
| Databáze: | OpenAIRE |
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