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Optics Letters

Optics Letters


  • Vol. 28, Iss. 11 — Jun. 1, 2003
  • pp: 932–934

Current-controlled curvature of coated micromirrors

Wei Liu and Joseph J. Talghader  »View Author Affiliations

Optics Letters, Vol. 28, Issue 11, pp. 932-934 (2003)

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Precise control of micromirror curvature is critical in many optical microsystems. Micromirrors with current-controlled curvature are demonstrated. The working principle is that resistive heating changes the temperature of the micromirrors and thermal expansion induces a controlled curvature whose magnitude is determined by coating design. For example, for wide focal-length tuning, the radius of curvature of a gold-coated mirror was tuned from 2.5 to 8.2 mm over a current-induced temperature range from 22° to 72 °C. For fine focal-length tuning, the radius of curvature of a dielectric-coated (SiO2 /Y2O3λ/4pairs) mirror was tuned from -0.68 to -0.64mm over a current-induced temperature range from 22 to 84 °C. These results should be readily extendable to mirror flattening or real-time adaptive shape control.

© 2003 Optical Society of America

OCIS Codes
(220.2560) Optical design and fabrication : Propagating methods
(310.0310) Thin films : Thin films

Wei Liu and Joseph J. Talghader, "Current-controlled curvature of coated micromirrors," Opt. Lett. 28, 932-934 (2003)

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