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19 May 2000 Optical nonlinearity and holographic storage in azo side-chain liquid crystal polymer
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Proceedings Volume 3939, Organic Photonic Materials and Devices II; (2000)
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
In this paper, the optical nonlinearity and multiplex holographic storage using azo side-chain polymer are studied by degenerate four-wave mixing and polarized light pump- probe method with a Ne-Ne laser. The He-Ne laser wavelength is located in the tail of absorption peak of sample. This material shows high diffraction efficiency of gratin and information storage capability in the case of weak absorption. The diffraction of grating is up to the order of 10-2. The effect of polarization beams on grating is studied. The diffraction efficiency of grating is least in the case that the polarization of readout beam is orthogonal to that of both writing beams. An angle multiplex holographic storage in the sample is performed and information can be stored for long-term in room temperature. The information readout of multiple holographic storage in the samples can be controlled by the polarization of readout beam. The diffraction deficiency of grating versus temperature of sample is studied. It is demonstrated that the higher temperature under the melt-temperature the sample has, the larger diffraction efficiency and faster relaxation grating has. The grating is completely erased by increasing temperature over the melting-temperature of the sample. Reading the grating with a circular polarized light is not able to erase the grating. When two recording beams are turned off, great parts of the grating remains for a long- term beside few part of the grating degrades. The results show that the azo side-chain polymer is a good information storage material.
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Xinxian Bao, Yanqing Tian, and William M. Tong "Optical nonlinearity and holographic storage in azo side-chain liquid crystal polymer", Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000);

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