Mechanism of optical modulation using ferroelectric liquid crystals
| Autor: | K G Balakrishnan, P Ramakrishnan |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Materials science
Field (physics) business.industry Condensed Matter Physics Ferroelectricity Atomic and Molecular Physics and Optics Optical axis Optics Mechanics of Materials Liquid crystal Modulation Electric field Signal Processing Electrode General Materials Science Electrical and Electronic Engineering business Civil and Structural Engineering Voltage |
| Zdroj: | Smart Materials and Structures. 1:168-171 |
| ISSN: | 1361-665X 0964-1726 |
| DOI: | 10.1088/0964-1726/1/2/011 |
| Popis: | The electro-optic response is investigated for an FLC having a moderate value of spontaneous polarization (Ps=20-30 nC cm-2) and a small helical pitch (Po=0.3-0.5 microns) with a cell thickness of 15 microns. Initially when no electric field is applied the average optical axis of the helical structure coincides with the helical axis. A DC voltage applied across the electrodes switches the optical axis by an angle depending on the magnitude and direction of the field. An alternating voltage applied to the specimen in conjunction to this DC voltage produces oscillations of the optical axis about this mean position. Hence the light transmission through the FLC varies linearly with the applied voltage. This electro-optic modulation is studied for signals of frequencies from 300 Hz to 5 kHz. With suitable modifications to compensate for the decrease in response at high frequencies, the FLC gives fairly uniform response over this frequency range. |
| Databáze: | OpenAIRE |
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