Alignment of smectic mesogens over engineered surfaces
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Alignment of smectic mesogens over engineered surfaces
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| Creator |
Chandran, Achu
Joshi, Tilak Khanna, P. K. Mehta, Dalip S. Haranath, D. Biradar, Ashok M. |
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| Subject |
Applied Physics/Condensed Matter
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| Description |
The alignment of smectic C* liquid crystals (LCs) has been manipulated over and near different surfaces such as bare glass, indium tin oxide (ITO) coated glass, patterned glass, and near spacers. The LC sample cell is made of one ITO coated glass plate and other having striped ITO with a Mylar spacer maintaining a finite cell gap between them. Laser scribing is used to make striped ITO, while the scribed area results in the formation of the patterned glass surface. The geometry of the cell is such that overlapped ITO lie in the middle and spacers are placed in the two extreme corners of the cell. The alignment of LC is found to be homeotropic over the ITO coated glass, while it is planar near the spacer. Interestingly, a transition from homeotropic to planar is observed while moving away from the middle towards either corner of the cell. The origin of both types of alignment in the same cell has been explained by considering the difference in the surface energy of different surfaces. This work renders new advancement towards the manipulation of LC alignment using different surfaces and interfaces for advanced electro-optical and photonic devices based on LCs.
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| Publisher |
American Institute of Physics
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| Date |
2017-07-07
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/2599/1/Alignment%20of%20smectic%20mesogens%20over%20engineered%20surfaces.pdf
Chandran, Achu and Joshi, Tilak and Khanna, P. K. and Mehta, Dalip S. and Haranath, D. and Biradar, Ashok M. (2017) Alignment of smectic mesogens over engineered surfaces. Journal of Applied Physics , 112 (014101). 014101-1-014101-6. ISSN 0021-8979 |
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| Relation |
http://npl.csircentral.net/2599/
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