Skip to main content

Experimental improvement of birefringence and response time in Liquid Crystals using surface preparation of polyimide at 20GHz

Publication ,  Journal Article
Machado, M; Ebadi, S; Driscoll, T; Smith, D
Published in: IEEE MTT-S International Microwave Symposium Digest
January 1, 2014

This paper presents an experimental study analyzing the effects of surface treated Polyimide (PI) on dielectric anisotropy and response time of Liquid Crystal (LC) in an In-Plane Switching (IPS) cell design. A Co-Planar Waveguide (CPW) transmission line is used as an in-plane interrogation architecture, with a layer of LC enclosed on top of the CPW. By applying different surface preparations of PI, we are able to derive an optimum condition to maximize birefringence and minimize response times at 20GHz. Measured phase change is increased from 28 deg to 72 deg for the same length of the CPW line. At the same time, measurement results show that fall time is decreased from 9.32s down to 4.1s. These improvements will facilitate realization of LC in microwave devices in need of fast and tunable materials. © 2014 IEEE.

Duke Scholars

Published In

IEEE MTT-S International Microwave Symposium Digest

DOI

ISSN

0149-645X

Publication Date

January 1, 2014
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Machado, M., Ebadi, S., Driscoll, T., & Smith, D. (2014). Experimental improvement of birefringence and response time in Liquid Crystals using surface preparation of polyimide at 20GHz. IEEE MTT-S International Microwave Symposium Digest. https://doi.org/10.1109/MWSYM.2014.6848609
Machado, M., S. Ebadi, T. Driscoll, and D. Smith. “Experimental improvement of birefringence and response time in Liquid Crystals using surface preparation of polyimide at 20GHz.” IEEE MTT-S International Microwave Symposium Digest, January 1, 2014. https://doi.org/10.1109/MWSYM.2014.6848609.
Machado M, Ebadi S, Driscoll T, Smith D. Experimental improvement of birefringence and response time in Liquid Crystals using surface preparation of polyimide at 20GHz. IEEE MTT-S International Microwave Symposium Digest. 2014 Jan 1;
Machado, M., et al. “Experimental improvement of birefringence and response time in Liquid Crystals using surface preparation of polyimide at 20GHz.” IEEE MTT-S International Microwave Symposium Digest, Jan. 2014. Scopus, doi:10.1109/MWSYM.2014.6848609.
Machado M, Ebadi S, Driscoll T, Smith D. Experimental improvement of birefringence and response time in Liquid Crystals using surface preparation of polyimide at 20GHz. IEEE MTT-S International Microwave Symposium Digest. 2014 Jan 1;

Published In

IEEE MTT-S International Microwave Symposium Digest

DOI

ISSN

0149-645X

Publication Date

January 1, 2014