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Long range surface plasmon fluorescence spectroscopy
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10.1063/1.2345594
/content/aip/journal/apl/89/10/10.1063/1.2345594
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/10/10.1063/1.2345594
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Figures

Image of FIG. 1.
FIG. 1.

(a) Kretschmann configuration for surface plasmon excitation. (b) Angular reflectivity scan simulated for a high refractive index prism ( at and Ag with , in contact with water of ). (c) Normalized optical field distribution, vs , normal to the interface for the architecture given in (a) but calculated for (cf the broken blue lines) of Au as the metal layer. (d) Kretschmann configuration for the excitation of LRSP: onto the high index prism first a layer of a low index cladding layer is deposited (here assumed with ), followed by the metal coating (Ag with ), operating in water. (e) Reflectivity scan simulation for the architecture given in (d). (f) Optical field distribution for a layer architecture similar to the one given in (d), however, calculated for a thin Au layer (, ), and a refractive index of the cladding layer of in order to simulate a situation close to the experimental conditions (cf. below). Note the substantial asymmetry in the field distribution, however, with a significantly enhanced decay length into the analyte solution (in order to better show this difference to normal SPR [cf. (c)] we scaled both fields to the value at the metal/water interface).

Image of FIG. 2.
FIG. 2.

Simulations of the dependence of the optical field intensity at the metal/water interface, and of the decay length on the refractive index of the cladding material in the Kretschmann configuration for LRSP excitation.

Image of FIG. 3.
FIG. 3.

(a) Test sample for the evaluation of PSP- or LRSP-excited fluorescence, respectively. For the LRSP case the Au metal layer was evaporated onto a thick Teflon cladding layer, spin coated onto the high index glass substrate. The of polystyrene prevents in both cases the fluorophores from being quenched by the proximity of the metal substrate (which would act as a broadband acceptor layer). (b) Comparison of the angular reflectivity scans recorded with normal SPR (open circles) and in the LRSP configuration (open triangles), together with the simultaneously measured angular fluorescence intensity curves (full circles for SPFS and full triangles for the LRSP fluorescence, respectively). (c) Comparison of the angular reflectivity scans recorded with normal SPR (open circles) and in the LRSP configuration (open triangles), together with the simultaneously measured angular fluorescence intensity curves (full circles for SPFS and full triangles for the LRSP fluorescence, respectively).

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/content/aip/journal/apl/89/10/10.1063/1.2345594
2006-09-06
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Long range surface plasmon fluorescence spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/10/10.1063/1.2345594
10.1063/1.2345594
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