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Effects of substrate micropatterning on nonlinear optical properties of polar self-assembling films

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2 Author(s)
Li, Leiming ; Departments of Materials Science and Engineering and Chemistry, Medical School, Northwestern University, Evanston, Illinois 60208 ; Stupp, Samuel I.

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Self-assembling triblock molecules were previously shown to form thin films with polar order. These films are also known to contain polar supramolecular aggregates that are layered in head-to-tail fashion. In this work, glass substrates were prepared using a focused-ion-beam system to generate 1 mm×1 mm areas containing periodic arrays of squares with lateral dimensions of 7 and 17 μm. The squares were defined by 3 μm wide and 10 nm deep troughs created by Ga ion beams. Using second-harmonic-generation measurements, the average molecular tilt angle was found to be smaller in patterned films, suggesting that micropatterning enhances overall polarization in these films. © 2001 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:78 ,  Issue: 26 )

Date of Publication:

Jun 2001

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