Abstract

Two-dimensional angular optical scattering (TAOS) is recorded for several particle shapes and configurations. A lens is used to collect a large solid angle of the light and transform the angular profile into a planar distribution according to the Abbé sine condition. Qualitative agreement is found between experiment and theory for the TAOS from spheroids having the same aspect ratio but different sizes. A distinctive irregular island structure is observed in the TAOS from clusters of Bacillus subtilis spores and polystyrene latex spheres. The density per solid angle of these islands is found to increase with cluster diameter.

© 1998 Optical Society of America

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References

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    [CrossRef]
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1996 (1)

E. Hirst and P. H. Kaye, J. Geophys. Res. 101, 19231 (1996); P. Kaye, E. Hirst, and Z. Wang-Thomas, Appl. Opt. 36, 6149 (1997).
[CrossRef] [PubMed]

1995 (1)

1994 (1)

M. I. Mishchenko and L. D. Travis, Opt. Commun. 109, 16 (1994).
[CrossRef]

1988 (1)

1985 (1)

1973 (1)

R. N. Berglund and B. Y. H. Liu, Environ. Sci. Technol. 7, 147 (1973).
[CrossRef]

Barber, P. W.

P. W. Barber and S. C. Hill, Light Scattering by Particles: Computational Methods (World Scientific, Singapore, 1990).

Berglund, R. N.

R. N. Berglund and B. Y. H. Liu, Environ. Sci. Technol. 7, 147 (1973).
[CrossRef]

Bohren, C. F.

C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley, New York, 1983).

Chylek, P.

Fuller, K.

Hill, S. C.

P. W. Barber and S. C. Hill, Light Scattering by Particles: Computational Methods (World Scientific, Singapore, 1990).

Hirst, E.

E. Hirst and P. H. Kaye, J. Geophys. Res. 101, 19231 (1996); P. Kaye, E. Hirst, and Z. Wang-Thomas, Appl. Opt. 36, 6149 (1997).
[CrossRef] [PubMed]

Huffman, D. R.

C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley, New York, 1983).

Jenkins, F. A.

F. A. Jenkins and H. E. White, Fundamentals of Optics, 3rd ed. (McGraw-Hill, New York, 1957), pp. 154–157.

Kattawar, G. W.

Kaye, P. H.

E. Hirst and P. H. Kaye, J. Geophys. Res. 101, 19231 (1996); P. Kaye, E. Hirst, and Z. Wang-Thomas, Appl. Opt. 36, 6149 (1997).
[CrossRef] [PubMed]

Liu, B. Y. H.

R. N. Berglund and B. Y. H. Liu, Environ. Sci. Technol. 7, 147 (1973).
[CrossRef]

Marston, P.

Mishchenko, M. I.

M. I. Mishchenko and L. D. Travis, Opt. Commun. 109, 16 (1994).
[CrossRef]

Ngo, D.

Pinnick, R. G.

Travis, L. D.

M. I. Mishchenko and L. D. Travis, Opt. Commun. 109, 16 (1994).
[CrossRef]

Videen, G.

White, H. E.

F. A. Jenkins and H. E. White, Fundamentals of Optics, 3rd ed. (McGraw-Hill, New York, 1957), pp. 154–157.

Environ. Sci. Technol. (1)

R. N. Berglund and B. Y. H. Liu, Environ. Sci. Technol. 7, 147 (1973).
[CrossRef]

J. Geophys. Res. (1)

E. Hirst and P. H. Kaye, J. Geophys. Res. 101, 19231 (1996); P. Kaye, E. Hirst, and Z. Wang-Thomas, Appl. Opt. 36, 6149 (1997).
[CrossRef] [PubMed]

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

Opt. Commun. (1)

M. I. Mishchenko and L. D. Travis, Opt. Commun. 109, 16 (1994).
[CrossRef]

Opt. Lett. (2)

Other (3)

F. A. Jenkins and H. E. White, Fundamentals of Optics, 3rd ed. (McGraw-Hill, New York, 1957), pp. 154–157.

C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley, New York, 1983).

P. W. Barber and S. C. Hill, Light Scattering by Particles: Computational Methods (World Scientific, Singapore, 1990).

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Figures (4)

Fig. 1
Fig. 1

(a) Laboratory coordinate system and a fluorescence image of a tilted (23° toward the laser) prolate EtOH droplet a/b=1.2 with a volume-equivalent radius of 39.2 µm. (b) Calculated backward TAOS of a prolate spheroid (a/b=1.2; volume-equivalent radius, 7.5 µm) tilted 23° toward the laser. (c), (d) Experimental TAOS for the spheroid in (a) and the boxed regions in (b), respectively.

Fig. 2
Fig. 2

(a) SEM image of a cluster (8-µm diameter) of BG spores (1 µm long and 0.5 µm in diameter). (b) TAOS in the near-forward direction. (c) TAOS in the near-backward direction.

Fig. 3
Fig. 3

(a) SEM image of a cluster (11-µm diameter) of PSL spheres (2.29-µm diameter). (b) TAOS in the near-forward direction. (c) TAOS in the near-backward direction.

Fig. 4
Fig. 4

Mean number of peaks and valleys in the TAOS from clusters with fixed (1.33-µm diameter) primary particles versus cluster size. Each point is the average of the densities from 20 images.

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