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We present a quantitative study of the distortion from a three-term diamond-like structure fabricated in SU8 polymer by four-beam holographic lithography. In the study of the refraction effect, theory suggests that the lattice in SU8 should be elongated in the  direction but have no distortion in the (111) plane, and each triangular-like hole array in the (111) plane would rotate by ~30º away from that in air. Our experiments agree with the prediction on the periodicity in the (111) plane and the rotation due to refraction effect, however, we find that the film shrinkage during lithographic process has nearly compensated the predicted elongation in the  direction. In study of photonic bandgap (PBG) properties of silicon photonic crystals templated by the SU8 structure, we find that the distortion has decreased quality of PBG.
holography, instrumentation, measurement, and metrology, refraction, physical optics, interference, materials, photonic crystals
Date Posted: 15 January 2008
This document has been peer reviewed.