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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 15 — Jul. 26, 2004
  • pp: 3428–3435

Cooperative microlenses

L.E. Helseth and T.M. Fischer  »View Author Affiliations

Optics Express, Vol. 12, Issue 15, pp. 3428-3435 (2004)

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We demonstrate that microspheres above a substrate act as microscopic lenses. Their Brownian motion causes the focal point to change abruptly, thereby creating characteristic intensity fluctuations which depend on the interaction between the spheres. To this end, superparamagnetic spheres in a magnetic field assemble into long pearl chains, where the intensity fluctuations depend on the stiffness of the chain. Upon assembling the superparamagnetic beads into a two-dimensional colloidal crystal, the fluctuations are restricted in two dimensions, and temporal network structures develop.

© 2004 Optical Society of America

OCIS Codes
(080.3630) Geometric optics : Lenses
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Research Papers

Original Manuscript: July 1, 2004
Revised Manuscript: July 13, 2004
Published: July 26, 2004

L. Helseth and T. Fischer, "Cooperative microlenses," Opt. Express 12, 3428-3435 (2004)

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