Dynamical Electro-Optical Characterization of Policryps Gratings

• Authors: G. Abbate , A. Marino , F. Vita
• Languages of publication: EN

Abstracts

EN

We have studied the dynamical response at 633 and 1550 nm of a new polymer-liquid crystal composite, realized in a form of a thick grating. This composite is known as Policryps, an acronym that stands for "Polymer Liquid Crystals Polymer Slides", because it shows a sequence of polymeric sheets alternated by layers containing only liquid crystal. Policryps gratings can be electrically switched between diffracting and non-diffracting states with a good diffraction efficiency in the visible region. After optimization of their performances, including response time, in the near infrared region, they can be conveniently proposed as a key component in photonic devices for telecom applications. Our results show very interesting response times ranging from 1 to 3 ms (switching on) and from 0.1 to 0.4 ms (switching off). Furthermore, switching ON times appear to be ruled by two different physical mechanisms with characteristic times differing by one order of magnitude. A deeper insight of these mechanisms might lead to response times, all in the submillisecond range.

Keywords

EN

42.70.Df; 42.79.Kr

Discipline

• 42.79.Kr: Display devices, liquid-crystal devices(see also 85.60.Pg Display systems)
• 42.70.Df: Liquid crystals(for structure of liquid crystals, see 61.30.-v)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2003
• Volume: 103
• Issue: 2-3
• Pages: 177-186

Dates

published

2003-02/03

received

2002-09-05

Contributors

author

G. Abbate

• INFM UdR of Naples and DSF Università di Napoli Federico II, Napoli, Italy

author

A. Marino

• INFM UdR of Naples and DSF Università di Napoli Federico II, Napoli, Italy

author

F. Vita

• INFM UdR of Naples and DSF Università di Napoli Federico II, Napoli, Italy

References

• 1. L. Eldada, Opt. Eng., 40, 1165, 2001 and references therein
• 2. Liquid Crystals V, Ed. I.C. Khoo, Proc. SPIE, 4463, (2001); the whole volume is dedicated to the subject
• 3. R. Caputo, A.V. Sukhov, C. Umeton, R.F. Ushakov, J. Exp. Theor. Phys., 91, 1190, 2000
• 4. R. Caputo, A.V. Sukhov, N.V. Tabirian, C. Umeton, R.F. Ushakov, Chem. Phys., 271, 323, 2001
• 5. G. Abbate, A. Marino, F. Vita, to be published in Mol. Cryst, Liq. Cryst
• 6. Devices for Routing in Optical Networks Using New Liquid Crystals Materials and Composites; Research Project of National Interest (PRIN 2000) by Italian Ministry of Education and Research
• 7. T.K. Gaylord, M.G. Moharam, Proc. IEEE, 73, 894, 1985
• 8. G. Montemezzani, M. Zgonik, Phys. Rev. E, 55, 1035, 1997
• 9. G. Abbate, G. Del Gais, L. De Stefano, A. Marino, T. Wagner, to be published in Mol. Cryst. Liq. Cryst

Identifiers

DOI

10.12693/APhysPolA.103.177