Abstract

Experimental elastic-scattering characteristics of layered microspheres are reported. Single particles consisting of glass cores coated with glycerine are suspended in an evacuated quadrupole trap, and scattered light intensity is measured at a fixed angle as the glycerine evaporates. The results are compared with those calculated for concentric spheres using the Mie theory. Excellent agreement is obtained for glycerine layers of thickness less than 700 nm. For thicker layers, differences occur that are attributed to the effect of gravity on particle structure.

© 1988 Optical Society of America

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References

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  1. A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
    [CrossRef]
  2. R. F. Wuerker, H. Shelton, R. V. Langmuir, J. Appl. Phys. 30, 342 (1959).
    [CrossRef]
  3. R. L. Hightower, C. B. Richardson, Appl. Opt. (to be published).
  4. W. J. Wiscombe, Document PB 301388 (National Technical Information Service, Springfield, Va., 1979).
  5. C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

1985 (1)

C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

1959 (1)

R. F. Wuerker, H. Shelton, R. V. Langmuir, J. Appl. Phys. 30, 342 (1959).
[CrossRef]

1951 (1)

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

Aden, A. L.

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

Hightower, R. L.

R. L. Hightower, C. B. Richardson, Appl. Opt. (to be published).

Kerker, M.

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

Langmuir, R. V.

R. F. Wuerker, H. Shelton, R. V. Langmuir, J. Appl. Phys. 30, 342 (1959).
[CrossRef]

Lin, H.-B.

C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

McGraw, R.

C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

Richardson, C. B.

C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

R. L. Hightower, C. B. Richardson, Appl. Opt. (to be published).

Shelton, H.

R. F. Wuerker, H. Shelton, R. V. Langmuir, J. Appl. Phys. 30, 342 (1959).
[CrossRef]

Tang, I. N.

C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

Wiscombe, W. J.

W. J. Wiscombe, Document PB 301388 (National Technical Information Service, Springfield, Va., 1979).

Wuerker, R. F.

R. F. Wuerker, H. Shelton, R. V. Langmuir, J. Appl. Phys. 30, 342 (1959).
[CrossRef]

Aerosol Sci. Technol. (1)

C. B. Richardson, H.-B. Lin, R. McGraw, I. N. Tang, Aerosol Sci. Technol. 5, 103 (1985).

J. Appl. Phys. (2)

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

R. F. Wuerker, H. Shelton, R. V. Langmuir, J. Appl. Phys. 30, 342 (1959).
[CrossRef]

Other (2)

R. L. Hightower, C. B. Richardson, Appl. Opt. (to be published).

W. J. Wiscombe, Document PB 301388 (National Technical Information Service, Springfield, Va., 1979).

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Figures (4)

Fig. 1
Fig. 1

Record of intensity of light scattered 90.5° from a glycerine-coated glass microsphere. Upper trace: early in the evaporation period (1 min/major division). Middle trace: midway in the evaporation period (30 sec/major division). Lower trace: late in the evaporation period (30 sec/major division). Letters identify features for comparison with Fig. 2.

Fig. 2
Fig. 2

Mie theory results for scattering 90.5° from a sphere versus particle size parameter x = 2πr/λ. Upper trace: layered sphere with a core radius of 3020 nm, a core index of 1.510, and a layer index of 1.473. Lower trace: homogeneous sphere with an index of refraction of 1.473, the glycerine value.

Fig. 3
Fig. 3

Upper trace: record of intensity of light scattered 90.5° from a glycerine-coated glass microsphere. Lower trace: Mie theory results for scattering 90.5° from a layered sphere with a core radius of 4223 nm, a core index of 1.510, and a layer index of 1.473 versus the particle radius.

Fig. 4
Fig. 4

Thickness of the glycerine layer for the particle in Fig. 3 versus time.

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