Journal
OPTICS EXPRESS
Volume 24, Issue 26, Pages 29908-29921Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.029908
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Funding
- National Key Basic Research Program of China [2014CB931702]
- National Natural Science Foundation of China (NSFC) [51572128, 11604152]
- NSFC-RGC [5151101197]
- Natural Science Foundation of Jiangsu Province [BK20160815]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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For heavily-doped semiconductor nanocrystals, a new class of plasmonic materials, the abundant dopants provide sufficient free carriers, but also act as scattering impurities, which have been limiting the merit of localized surface plasmon resonance (LSPR). To resolve this intrinsic contradiction, we propose a core-shell (heavily-lightly doped) semiconductor nanosystem to generate plasmon resonance from the highly mobile diffusive charges rather than the strongly scattered charges. We develop a complete theory to describe the spatial distribution of the diffusive charges as well as their resonance under the light excitation and predict a LSPR tunable from mid to far infrared band with a 15-fold field enhancement near the resonance. Meanwhile, the physical nature of such LSPR, which is different from the bonding and antibonding plasmon mode in typical core-shell structures, was revealed by studying the polarization charge distribution. Hopefully, these results can help realize high quality plasmonic structures for applications in infrared waveband. (C) 2016 Optical Society of America
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