Journal
SCIENTIFIC REPORTS
Volume 3, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep01241
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Funding
- Air Force Office of Scientific Research Grant [FA9550-10-1-0264]
- National Science Foundation Grant [DMR-1120923]
- NSF Meta-PREM grant [1205457]
- MEXT, Japan [24350104, 24656385]
- Young Researcher Overseas Visits Program for Vitalizing Brain Circulation of JSPS, Japan
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1205457] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [24656385] Funding Source: KAKEN
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The spaser, a quantum amplifier of surface plasmons by stimulated emission of radiation, is recognized as a coherent light source capable of confining optical fields at subwavelength scale. The control over the directionality of spasing has not been addressed so far, especially for a single-particle spasing nanocavity where optical feedback is solely provided by a plasmon resonance. In this work we numerically examine an asymmetric spaser - a resonant system comprising a dielectric core capped by a metal semishell. The proposed spaser emits unidirectionally along the axis of the semishell; this directionality depends neither on the incident polarization nor on the incident angle of the pump. The spasing efficiency of the semishell-capped resonator is one order of magnitude higher than that in the closed core-shell counterpart. Our calculations indicate that symmetry breaking can serve as a route to create unidirectional, highly intense, single-particle, coherent light sources at subwavelength scale.
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