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Measurement of the air gap width between double-deck metal layers based on surface plasmon resonance
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10.1063/1.3354011
/content/aip/journal/jap/107/8/10.1063/1.3354011
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/8/10.1063/1.3354011
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The architecture of a five-layer KR configuration. The gold-plated glass slide could be moved toward another gold-plated prism to decrease the air gap width.

Image of FIG. 2.
FIG. 2.

The overall three-dimensional (3D) simulated reflectivity as functions of incident angle and air gap width for the traditional three-layer Otto configuration. The SPR could occur only at the air gap width of about 500 nm. (Lower plot is the top view of the upper).

Image of FIG. 3.
FIG. 3.

The overall 3D simulated reflectivity as functions of incident angle and the thickness of gold film for the traditional three-layer Otto configuration. The SPR should occur if the gold film thickness is more than 40 nm in a constant air gap width of 500 nm. (Lower plot is the top view of the upper.)

Image of FIG. 4.
FIG. 4.

The overall 3D simulated reflectivity as functions of incident angle and the refractive index of glass slide for the assumed three-layer configuration (prism/Au film/glass slide). The SPR could occur only if the refractive index of glass slide is less than 1.4. (Lower plot is the top view of the upper.)

Image of FIG. 5.
FIG. 5.

The overall 3D simulated reflectivity as functions of incident angle and air gap width for the four-layer KR configuration. The angle of resonance would monotonically shift to a larger position of incident angle if the air gap width reduces to smaller than 350 nm. (Lower plot is the top view of the upper.)

Image of FIG. 6.
FIG. 6.

The overall 3D simulated reflectivity as functions of incident angle and air gap width for the five-layer configuration (prism/Au film/air gap/Au film/glass slide). There are some FP resonance valleys appeared in the section of small incident angles. The SP resonance angle would monotonically shift to a larger incident angle position if the air gap width reduces to smaller than 700 nm. (Lower plot is the top view of the upper.)

Image of FIG. 7.
FIG. 7.

The overall measured reflectivity of a five-layer configuration (prism/Au film/air gap/Au film/glass slide) as a function of incident angle . The plots (a), (b), (c), and (d) indicate the different steps in the air gap narrowing steps, and the FP resonance effect becomes obvious as the air gap narrowing. In plot (d), the fitted air gap width is 1424 nm for the red (with mark ◻) curve and 1267 nm for the blue curve (with mark ○).

Image of FIG. 8.
FIG. 8.

The overall measured reflectivity of a five-layer configuration (prism/Au film/air gap/Au film/glass slide). Curves 1–6 indicate that the reflectivity is measured in various air gap widths in the gap narrowing steps, respectively. It is obvious that the TIR peak decreases first, then the reflectivity at the resonance angle rises, and finally the resonance angle shifts, as in Ref. 7. The measured reflectivity marked as ●, ◼, ◻, ◻, ▲, and ▼ is corresponding to a fitted air gap width of 1100, 904, 851, 734, 629, and 539 nm, respectively.

Image of FIG. 9.
FIG. 9.

The overall simulated reflectivity of a five-layer configuration (prism/Au film/air gap/Au film/glass slide). The simulated reflectivity curves represent an air gap width of 1100, 904, 851, 734, 629, and 539 nm between the gold-plated prism and the gold-plated glass slide. It matches well to the measured reflectivity curves shown in Fig. 8.

Image of FIG. 10.
FIG. 10.

The overall simulated reflectivity of a five-layer configuration (prism/Au film/air gap/Au film/glass slide). When the air gap width is smaller than 400 nm, the reflectivity curve would lose its characteristics and an accurate measurement of air gap width by curve-fitting is difficult. (Lower plot is the top view of the upper).

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/content/aip/journal/jap/107/8/10.1063/1.3354011
2010-04-29
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurement of the air gap width between double-deck metal layers based on surface plasmon resonance
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/8/10.1063/1.3354011
10.1063/1.3354011
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