Journal
ACS PHOTONICS
Volume 4, Issue 4, Pages 1003-1008Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00088
Keywords
surface plasmon; spaser; local density of states; energy transfer; mode volume
Categories
Funding
- NSF [DMR1610427, HRD-1547754]
- Direct For Education and Human Resources
- Division Of Human Resource Development [1547754] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1610427] Funding Source: National Science Foundation
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We present a unified approach to describe spasing in plasmonic systems modeled by quantum emitters interacting with resonant plasmon mode. We show that spaser threshold implies detailed energy transfer balance between the gain and plasmon mode and derive explicit spaser condition valid for arbitrary plasmonic systems. By defining carefully the plasmon mode volume relative to the gain region, we show that the spaser condition represents, in fact, the standard laser threshold condition extended to plasmonic systems with dispersive dielectric function. For extended gain region, the saturated mode volume depends solely on the system parameters that determine the lower bound of threshold population inversion.
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