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Sensing using differential surface plasmon ellipsometry
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10.1063/1.1778218
/content/aip/journal/jap/96/5/10.1063/1.1778218
http://aip.metastore.ingenta.com/content/aip/journal/jap/96/5/10.1063/1.1778218
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A schematic of the ellipse describing the light reflected from a Kretschmann SP system with incident light consisting of both and components. is the azimuth of the ellipse, with and being the purely p and s components.

Image of FIG. 2.
FIG. 2.

A schematic of the experimental arrangement. L, laser ; C, beam chopper; P1, fixed angle polarizer; P2, rotating polarizer; D, photodiode detector; PSD, phase sensitive detector. The isosceles prism angle is , and it has a refractive index of (at ).

Image of FIG. 3.
FIG. 3.

The angle scan performed at the start of the liquid experiment in order to determine the parameters of the silver (inset). Both the data and theoretical fit are shown.

Image of FIG. 4.
FIG. 4.

The detected intensity as a function of the output polarizer angle for three different liquid mixtures corresponding to refractive indices of (a) 1.4560, (b) 1.4617, and (c) 1.4673. Both the experimental data (crosses) and the theory (full line) are shown. The theoretical lines are obtained using the same parameters for the system as obtained from the initial angle scan.

Image of FIG. 5.
FIG. 5.

The angle scan obtained at the end of the liquid experiment, with a theoretical line obtained using the same system parameters as obtained from the initial angle scan apart from a change of liquid refractive index.

Image of FIG. 6.
FIG. 6.

A theoretical plot of the modulus of the differential of the intensity with respect to the polarizer angle (using the parameters for the system obtained from the initial angle scan), with the squares corresponding to the positions of obtained from the experiment. The white in the grayscale plot corresponds to the zero in the differential, which gives the theoretical position of as a function of the refractive index.

Image of FIG. 7.
FIG. 7.

The measured data and comparison with theory of the surface plasmon resonance used for the differential experiment. The silver film parameters obtained are shown, and these were subsequently used in comparing the data obtained from the differential experiments with theory.

Image of FIG. 8.
FIG. 8.

A schematic of the experimental arrangement used in both differential experiments. Note, the refractive index of the prism is now 1.456, with the prism angle being .

Image of FIG. 9.
FIG. 9.

The measured signal obtained for the nonfeedback differential experiment as the proportion of argon in the argon-nitrogen mix is changed.

Image of FIG. 10.
FIG. 10.

A comparison of the data obtained from Fig. 9 (after conversion to polarization rotation) with the theory obtained using the parameters obtained from Fig. 7. Two theory lines are shown: one for an incident external angle of (the intended incident angle), and one for the best comparison with the data at an incident external angle of .

Image of FIG. 11.
FIG. 11.

The measured signal obtained for the feedback differential experiment as the proportion of argon in the gas mix was changed. The sign of the voltage is opposite to that in Fig. 9 because the phase of the reference signal with respect to the measured signal was different in this experiment. The choice of a positive direction is arbitrary.

Image of FIG. 12.
FIG. 12.

A comparison of the data obtained from Fig. 11 (after conversion to polarization rotation) with the theory obtained using the parameters obtained from Fig. 7. Two theory lines are shown: one for an incident external angle of (the intended incident angle), and one for the best comparison with the data at an incident external angle of .

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/content/aip/journal/jap/96/5/10.1063/1.1778218
2004-09-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sensing using differential surface plasmon ellipsometry
http://aip.metastore.ingenta.com/content/aip/journal/jap/96/5/10.1063/1.1778218
10.1063/1.1778218
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