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Proceedings Paper

Tilted logpile photonic crystals using the LIGA technique
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Paper Abstract

The LIGA microfabrication technique offers a unique method for fabricating 3-dimensional photonic lattices based on the Iowa State "logpile" structure. These structures represent the [111] orientation of the [100] logpile structures previously demonstrated by Sandia National Laboratories. The novelty to this approach is the single step process that does not require any alignment. The mask and substrate are fixed to one another and exposed twice from different angles using a synchrotron light source. The first exposure patterns the resist at an angle of 45 degrees normal to the substrate with a rotation of 8 degrees. The second exposure requires a 180 degree rotation about the normal of the mask and substrate. The resulting pattern is a vertically oriented logpile pattern that is rotated slightly off axis. The exposed PMMA is developed in a single step to produce an inverse lattice structure. This mold is filled with electroplated gold and stripped away to create a usable gold photonic crystal. Tilted logpiles demonstrate band characteristics very similar to those observed from [100] logpiles. Reflectivity tests show a band edge around 5 μm and compare well with numerical simulations.

Paper Details

Date Published: 5 September 2006
PDF: 7 pages
Proc. SPIE 6289, Novel Optical Systems Design and Optimization IX, 62890A (5 September 2006); doi: 10.1117/12.681214
Show Author Affiliations
J. D. Williams, Sandia National Labs. (United States)
C. Arrington, Sandia National Labs. (United States)
W. C. Sweatt, Sandia National Labs. (United States)
D. W. Peters, Sandia National Labs. (United States)
I. El-Kady, Sandia National Labs. (United States)
A. R. Ellis, Sandia National Labs. (United States)
J. Verley, Sandia National Labs. (United States)
F. B. McCormick, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 6289:
Novel Optical Systems Design and Optimization IX
José M. Sasian; Mary G. Turner, Editor(s)

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