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Proceedings Paper

Mechanically tunable photonic crystal lens
Author(s): Y. Cui; V. A. Tamma; J.-B. Lee; W. Park
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Paper Abstract

We designed, fabricated and characterized MEMS-enabled mechanically-tunable photonic crystal lens comprised of 2D photonic crystal and symmetrical electro-thermal actuators. The 2D photonic crystal was made of a honeycomb-lattice of 340 nm thick, 260 nm diameter high-index silicon rods embedded in low-index 10 μm thick SU-8 cladding. Silicon input waveguide and deflection block were also fabricated for light in-coupling and monitoring of focused spot size, respectively. When actuated, the electro-thermal actuators induced mechanical strain which changed the lattice constant of the photonic crystal and consequently modified the photonic band structure. This in turn modified the focal-length of the photonic crystal lens. The fabricated device was characterized using a tunable laser (1400~1602 nm) and an infrared camera during actuation. At the wavelength of 1450 nm, the lateral light spot size observed at the deflection block gradually decreased 40%, as applied current increased from 0 to 0.7 A, indicating changes in focal length in response to the mechanical stretching.

Paper Details

Date Published: 10 September 2010
PDF: 9 pages
Proc. SPIE 7756, Active Photonic Materials III, 77561A (10 September 2010); doi: 10.1117/12.860627
Show Author Affiliations
Y. Cui, Univ. of Colorado at Boulder (United States)
Univ. of Texas at Dallas (United States)
V. A. Tamma, Univ. of Colorado at Boulder (United States)
J.-B. Lee, Univ. of Texas at Dallas (United States)
W. Park, Univ. of Colorado at Boulder (United States)

Published in SPIE Proceedings Vol. 7756:
Active Photonic Materials III
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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