Conference proceeding
Application of liquid crystal polymer films for photolithographic fabrication of 3D structures
PRACTICAL HOLOGRAPHY XXII: MATERIALS AND APPLICATIONS, v 6912(1), pp 691202-691208
01 Jan 2008
Abstract
In this paper, we demonstrate a silicon etching application of a holographically formed polymer dispersed liquid crystal (H-PDLC) photomask. H-PDLC is a periodically nanostructured material consisting of stratified layers of polymer and liquid crystal. Due to the natural random alignment of the liquid crystal axes with respect to the polymer layers, an index of refraction mismatch exists and a reflection occurs. Application of bias across the film aligns the liquid crystals and eliminates the index mismatch causing the film to become transparent. H-PDLC films have been shown to sufficiently attenuate the UV exposure dose in the photolithographic process when in the unbiased state, and can be electrically controlled to modulate the amount of UV transmission when electric field is applied. We show etch depth profiles of patterns masked on a silicon substrate using the H-PDLC photomask device compared with etch profiles of similar structures patterned with more conventional ink jet printed photomasks and chrome on quartz glass photomasks. We investigate reactive ion etching technique and potassium hydroxide wet etch technique.
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Details
- Title
- Application of liquid crystal polymer films for photolithographic fabrication of 3D structures
- Creators
- Anna E. Fox - Drexel UniversityAdam K. Fontecchio - Drexel University
- Contributors
- H I Bjelkhagen (Editor)R K Kostuk (Editor)
- Publication Details
- PRACTICAL HOLOGRAPHY XXII: MATERIALS AND APPLICATIONS, v 6912(1), pp 691202-691208
- Series
- Proceedings of SPIE
- Publisher
- Spie-Int Soc Optical Engineering
- Number of pages
- 8
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Electrical and Computer Engineering
- Web of Science ID
- WOS:000254649500001
- Scopus ID
- 2-s2.0-40749135797
- Other Identifier
- 991020531827104721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Engineering, Electrical & Electronic
- Imaging Science & Photographic Technology
- Optics