Extraction efficiency of highly confined surface plasmon-polaritons to far-field radiation: an upper limitopen access
- Authors
- Yoon, Jaewoong; Song, Seok Ho; Kim, Jin-Ha
- Issue Date
- Jan-2008
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v.16, no.2, pp.1269 - 1279
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICS EXPRESS
- Volume
- 16
- Number
- 2
- Start Page
- 1269
- End Page
- 1279
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/179127
- DOI
- 10.1364/OE.16.001269
- ISSN
- 1094-4087
- Abstract
- We propose a unique method determining an upper limit of extraction efficiency of the surface plasmon-polaritons (SPPs), E-SP, which are highly confined on a corrugated metal surface. The method is based on measurement of the spectral bandwidth of a grating-induced absorption spectrum as a function of metal dielectric constant. After finding the fact that E-SP exhibits an extremely linear relationship with the collision frequency Gamma of metal over a SPP band below the surface plasmon frequency, an upper limit of E-SP can be determined by an asymptotic estimation as Gamma -> 0 for total decay rates of the confined SPPs. Our method based on the bandwidth measurement is inherently free from the ambiguity and underestimation difficulties pertaining to the previous prism-coupling approaches for E-SP estimation. It will also be quite applicable for evaluating SPP-mediated light-emitting diodes (LEDs) of which total external efficiency is dominantly restricted by the upper limit of E-SP. Especially for the case when SPP excitation probability approaches unity, the proposed method would excellently figure out the maximum realizable external efficiency of SPP-mediated LEDs.
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