期刊
OPTICS EXPRESS
卷 23, 期 11, 页码 14583-14595出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.014583
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- German Federal Ministry of Education and Research (PhoNa)
- Thuringian State Government (MeMa)
- German Science Foundation [SPP 1391]
- Deutsche Forschungsgemeinschaft
- Karlsruhe Institute of Technology
Optical plasmonic antennas allow for localizing and enhancing light at the nanoscale. To enhance the application opportunities of optical antennas, their quality factor needs to be substantially improved. Here, we numerically and experimentally demonstrate that the resonance of a dipolar metallic disc antenna can be enhanced by a circular grating that obeys the Bragg condition. The supporting grating effectively collects energy from an extended spatial domain and guides it spectrally-selected into the central antenna, leading to a significantly enhanced field intensity at resonance. Accordingly, the quality factor of the antenna is enhanced by at least five times. The approach can be applied to other plasmonic systems, hence constituting an important ingredient to a future plasmonic tool box. (C) 2015 Optical Society of America
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