期刊
ACS PHOTONICS
卷 7, 期 4, 页码 908-913出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00099
关键词
plasmonics; surface roughness; nonlocal response; coaxial aperture; hydrodynamic model; epsilon-near-zero mode
类别
资金
- AFOSR [FA9550-19-1-0240, FA9550-18-1-0187]
- National Science Foundation [NSF ECCS 1809723, ECCS 1809240]
- Sanford P. Bordeau Endowed Chair at the University of Minnesota
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.
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