Abstract

Stretched gold island films with large optical anisotropy are demonstrated for the first time to our knowledge. The resonance absorption wavelength for polarization parallel to the stretching direction shifted from 0.54 to 0.95 μm by stretching a 9-nm-thick gold island film by five times, whereas the resonance wavelength shifted slightly to the shorter wavelength for perpendicular polarization. The origin of optical anisotropy is shown to come from an elongated island shape. Embedding of island films in a glass film is also shown to be necessary to produce the anisotropy in the stretching process.

© 1992 Optical Society of America

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References

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  1. S. Kawakami, Appl. Opt. 22, 2426 (1983).
    [Crossref] [PubMed]
  2. S. D. Stookey, R. J. Araujio, Appl. Opt. 7, 777 (1968).
    [Crossref] [PubMed]
  3. K. Baba, M. Miyagi, J. Opt. Soc. Am. A 8, 619 (1991).
    [Crossref]
  4. K. Baba, M. Miyagi, Opt. Lett. 16, 964 (1991).
    [Crossref] [PubMed]
  5. E. D. Palik, ed., Handbook of Optical Constants of Solids (Academic, Orlando, Fla., 1985).
  6. See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
    [Crossref]

1991 (2)

1983 (1)

1978 (1)

See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
[Crossref]

1968 (1)

Andersson, T.

See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
[Crossref]

Araujio, R. J.

Baba, K.

Granqvist, C. G.

See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
[Crossref]

Hunderi, O.

See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
[Crossref]

Kawakami, S.

Miyagi, M.

Norrman, S.

See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
[Crossref]

Stookey, S. D.

Appl. Opt. (2)

J. Opt. Soc. Am. A (1)

Opt. Lett. (1)

Phys. Rev. B (1)

See, for example, S. Norrman, T. Andersson, C. G. Granqvist, O. Hunderi, Phys. Rev. B 18, 674 (1978).
[Crossref]

Other (1)

E. D. Palik, ed., Handbook of Optical Constants of Solids (Academic, Orlando, Fla., 1985).

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Figures (3)

Fig. 1
Fig. 1

Fabrication process of an anisotropic stretched metallic island film showing (a) evaporation, (b) embedding, and (c) stretching.

Fig. 2
Fig. 2

Measured spectral transmittances of a 9-nm-thick gold island film (a) nonstretched, (b) stretched by 2.6 times, and (c) stretched by 5 times for normally incident light polarized perpendicular (T) and parallel (T||) to the stretching direction.

Fig. 3
Fig. 3

Shifts in the resonance wavelength as a function of the stretching ratio. The solid and dashed curves correspond to the sample with the 0.35- and 0.15-μm-thick sputtered glass films, respectively. The dotted–dashed curves show theoretical shifts calculated from equations described in Ref. 4.

Equations (1)

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λ R = λ p [ m L - ( d w / l ) F + ( L - m ) ] 1 / 2 ,

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