A passively polarized holographic lithography system is proposed for fabricating highly uniform 2d crossed-arraystructures with periodic tunability and high throughput. The dielectric-film-based polarization modulati...
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A passively polarized holographic lithography system is proposed for fabricating highly uniform 2d crossed-arraystructures with periodic tunability and high throughput. The dielectric-film-based polarization modulation scheme is applied to an orthogonal two-axis Lloyd's mirror interferometer to guide the polarization modulation at the interfaces of the mirrors and simplify the exposure-system configuration for large-area fabrication. The proposed polarization-modulation system can fabricate stable large-area (30 mm x 30 mm) arraystructures with a wide period range from 742 to 1500 nm. Moreover, the established polarization-modulation model could be expanded with multiple dielectric films for attaining higher periodic tunability.
We examined a method to refine a technique to prepare close-packed monolayers of cylindrical zeolite L crystals tethered on a substrate through covalent linkages, which was developed recently for popular use. We attem...
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We examined a method to refine a technique to prepare close-packed monolayers of cylindrical zeolite L crystals tethered on a substrate through covalent linkages, which was developed recently for popular use. We attempted to fabricate both vertical and horizontal-unidirectional alignments of the zeolite particles. The vertical alignment for centimeter scale large areas was achieved on a flat glass substrate by using flat-based zeolite crystals with an aspect ratio (length divided by width) of 1.1 while the crystals with an aspect ratio of 1.7 failed to align vertically. Thus the parameters important for successful alignment were determined. On the other hand, the unidirectional alignment in the horizontal packing structures was achieved by employing pregrooved substrates. We found that the relationship between the sizes of zeolite crystals and grooves is a crucial factor for the preparation of a close-packed structure. In this respect, our present preparation requires further improvements because it resulted in structures with many void spaces. Furthermore, we prepared the zeolite films loaded with unidirectionally aligneddyes to achieve optical functionalities. (C) 2008 Elsevier Inc. All rights reserved.
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