Journal
OPTICS LETTERS
Volume 37, Issue 7, Pages 1181-1183Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.001181
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Funding
- State Key Program for Basic Research of China [2012CB921501]
- National Natural Science Foundation (NSFC) [10734010, 11021403, 11174137, 10804044, 11104136]
- Priority Academic Program Development (PAPD)
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We propose a novel type of plasmonic lasing nanostructure consisting of a metallic shell and a gain core. We demonstrate numerically that highly localized void modes of such metallodielectric core-shell nanoparticles have a very high quality factor. We found that the dipole void mode has a lasing threshold as low as 128 cm(-1) at 800 nm as a result of the unique mode distribution within the shell, due to a maximum field enhancement around the void center. The lasing condition for a symmetry-reduced silver nanocup is also investigated and the low plasmonic lasing threshold is sustained provided that the opening angle of the nanocup is smaller than 10 degrees. Our proposal presents a new path toward plasmonic lasers with low gain threshold. (C) 2012 Optical Society of America
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