Abstract

A surface-adsorbed monolayer of cap-shaped gold particles upon submicrometer-sized polystyrene spheres exhibits pronounced absorption in the visible region. When the surrounding refractive index was altered by immersion in a fluid, the direction of the shift in the absorption spectrum was dependent on the incidence angle of the irradiation. When a thiol molecule, known to adsorb selectively on gold upon polystyrene, was added, the resultant shift in the absorption spectrum’s peak was consistently toward longer wavelengths. Consequently, at certain incidence angles, a change in the refractive index of the surrounding fluid produces no shift, whereas thiol adsorption results in a clear shift, apparently reflecting the different spatial regions in which the refractive index is altered by these two procedures.

© 2002 Optical Society of America

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References

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T. Okamoto, I. Yamaguchi, and T. Kobayashi, Opt. Lett. 25, 372 (2000).
[CrossRef]

M. Himmelhaus and H. Takei, Sensors Actuators B 63, 24 (2000).
[CrossRef]

1999 (2)

H. Takei, J. Vac. Sci. Technol. B 17, 1906 (1999).
[CrossRef]

J. Homola, S. S. Yee, and G. Gauglitz, Sensors Actuators B 54, 3 (1999).
[CrossRef]

1998 (4)

M. Brust, D. Bethell, C. J. Kiely, and D. J. Schiffrin, Langmuir 14, 5425 (1998).
[CrossRef]

T. Serizawa, H. Takeshita, and M. Akashi, Langmuir 14, 4088 (1998).
[CrossRef]

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

S. Maltis and I. Rubinstein, Langmuir 14, 1116 (1998).
[CrossRef]

1993 (1)

1984 (1)

H. G. Craighead and G. A. Niklasson, Appl. Phys. Lett. 44, 1134 (1984).
[CrossRef]

Akashi, M.

T. Serizawa, H. Takeshita, and M. Akashi, Langmuir 14, 4088 (1998).
[CrossRef]

Aussenegg, F. R.

Bethell, D.

M. Brust, D. Bethell, C. J. Kiely, and D. J. Schiffrin, Langmuir 14, 5425 (1998).
[CrossRef]

Brunner, H.

Brust, M.

M. Brust, D. Bethell, C. J. Kiely, and D. J. Schiffrin, Langmuir 14, 5425 (1998).
[CrossRef]

Campbell, C. T.

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

Chinowsky, T. M.

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

Craighead, H. G.

H. G. Craighead and G. A. Niklasson, Appl. Phys. Lett. 44, 1134 (1984).
[CrossRef]

Gauglitz, G.

J. Homola, S. S. Yee, and G. Gauglitz, Sensors Actuators B 54, 3 (1999).
[CrossRef]

Himmelhaus, M.

M. Himmelhaus and H. Takei, Sensors Actuators B 63, 24 (2000).
[CrossRef]

Homola, J.

J. Homola, S. S. Yee, and G. Gauglitz, Sensors Actuators B 54, 3 (1999).
[CrossRef]

Jung, L. S.

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

Kiely, C. J.

M. Brust, D. Bethell, C. J. Kiely, and D. J. Schiffrin, Langmuir 14, 5425 (1998).
[CrossRef]

Kobayashi, T.

Kreibig, U.

U. Kreibig and M. Vollmer, Optical Properties of Metal Clusters (Springer-Verlag, Berlin, 1995).
[CrossRef]

Leitner, A.

Maltis, S.

S. Maltis and I. Rubinstein, Langmuir 14, 1116 (1998).
[CrossRef]

Mar, M. N.

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

Niklasson, G. A.

H. G. Craighead and G. A. Niklasson, Appl. Phys. Lett. 44, 1134 (1984).
[CrossRef]

Okamoto, T.

Rubinstein, I.

S. Maltis and I. Rubinstein, Langmuir 14, 1116 (1998).
[CrossRef]

Schiffrin, D. J.

M. Brust, D. Bethell, C. J. Kiely, and D. J. Schiffrin, Langmuir 14, 5425 (1998).
[CrossRef]

Serizawa, T.

T. Serizawa, H. Takeshita, and M. Akashi, Langmuir 14, 4088 (1998).
[CrossRef]

Takei, H.

M. Himmelhaus and H. Takei, Sensors Actuators B 63, 24 (2000).
[CrossRef]

H. Takei, J. Vac. Sci. Technol. B 17, 1906 (1999).
[CrossRef]

Takeshita, H.

T. Serizawa, H. Takeshita, and M. Akashi, Langmuir 14, 4088 (1998).
[CrossRef]

Vollmer, M.

U. Kreibig and M. Vollmer, Optical Properties of Metal Clusters (Springer-Verlag, Berlin, 1995).
[CrossRef]

Wokaun, A.

Yamaguchi, I.

Yee, S. S.

J. Homola, S. S. Yee, and G. Gauglitz, Sensors Actuators B 54, 3 (1999).
[CrossRef]

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

Zhao, Z.

Appl. Opt. (1)

Appl. Phys. Lett. (1)

H. G. Craighead and G. A. Niklasson, Appl. Phys. Lett. 44, 1134 (1984).
[CrossRef]

J. Vac. Sci. Technol. B (1)

H. Takei, J. Vac. Sci. Technol. B 17, 1906 (1999).
[CrossRef]

Langmuir (4)

M. Brust, D. Bethell, C. J. Kiely, and D. J. Schiffrin, Langmuir 14, 5425 (1998).
[CrossRef]

T. Serizawa, H. Takeshita, and M. Akashi, Langmuir 14, 4088 (1998).
[CrossRef]

L. S. Jung, C. T. Campbell, T. M. Chinowsky, M. N. Mar, and S. S. Yee, Langmuir 14, 5636 (1998).
[CrossRef]

S. Maltis and I. Rubinstein, Langmuir 14, 1116 (1998).
[CrossRef]

Opt. Lett. (1)

Sensors Actuators B (2)

M. Himmelhaus and H. Takei, Sensors Actuators B 63, 24 (2000).
[CrossRef]

J. Homola, S. S. Yee, and G. Gauglitz, Sensors Actuators B 54, 3 (1999).
[CrossRef]

Other (1)

U. Kreibig and M. Vollmer, Optical Properties of Metal Clusters (Springer-Verlag, Berlin, 1995).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Thiol-induced shifts in the absorption spectrum observed at normal incidence angle (110-nm polystyrene spheres with 20 nm of Au on top). (a) Spectrum of the sample in air before SAM formation. Immersion of the sample in pure ethanol shifts the spectrum to (b), and SAM formation leads to (c). (d) Spectrum of the sample in air after SAM formation and after rinsing and drying of the sample. The shift on ethanol immersion, (a)/(b), is 28.5 nm; thiol-adsorption-induced shifts are 4.5 nm in air (a)/(d), and 3 nm in ethanol, (b)/(c). All spectra were measured against a 40-nm-thick Au film whose reflectivities were 67% and 76% at the peak positions of (a) and (b), respectively. One inset shows how a sample is prepared, and the other is a scanning-electron micrograph of a typical sample.

Fig. 2
Fig. 2

Angle-dependent absorption spectra in air and ethanol.

Fig. 3
Fig. 3

Simulated spectra corresponding to those in Fig. 2.

Fig. 4
Fig. 4

Thiol-adsorption-induced shifts in the absorption spectra at 35° and 45° incidence angles. The sample was treated in the same fashion as described for Fig. 1.

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