Naslov
Enhanced molecular fluorescence mediated by long-range surface polaritons

Autori
Lenac, Zdravko ; Tomaš, Marin-Slobodan

Izvornik
Surface science (0039-6028) 215 (1989), 1-2; 299-318

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
molecular fluorescence ; long-range surface polariton

Sažetak
The energy transfer from a fluorescent molecule to surface polaritons supported by a thin metallic slab with flat surfaces is considered in the framework of classical electromagnetic theory. A detailed analysis of molecular power loss is presented for a free-standing slab as well as for the Sarid ATR configuration in which a prism is used to outcouple surface polaritons from the slab. On the basis of this theory, the intensity of the signal in the prism for fluorescence mediated by long-range surface polaritons in a 15 nm thick silver slab can be larger by a factor of ∼ 1130 at the emission wavelength λ = 514.5 nm in comparison with the intensity of the signal obtainable in the absence of the slab and the prism. Also, a rough estimate of possible enhancement in surface enhanced Raman scattering (SERS) is shown to give a corresponding factor of ∼ 9 × 105. In comparison with enhancements obtainable in the Kretschmann ATR configuration, where singleinterface surface polaritons are involved, these values are larger by factors of 5.4 (fluorescence) and roughly 29 (SERS).

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA