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Proceedings Paper

Polarization storage by two-photon absorption method in a diazobenzene/MMA copolymer
Author(s): Yanlei Hu; Zhoushun Zhang; Shuangyan Lei; Junjun Ding; Min Xu; Wenhao Huang; Qijin Zhang
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Paper Abstract

Optically induced molecular orientation by photoisomerization of chromophores has been intensively researched with views of application in photonics. We report a new polarization-encoded data storage method in a diazobenzene/MMA copolymer. Two-photon absorption (TPA) of 4-{(2-methacryloyloxyethyl)oxy}-4'-(4-nitrophenylazo)azobenzene/MMA copolymer creates a regularly angle variation of molecular orientation via a trans-cis isomerization process and induces birefringence in the sample. This feature is a key for ultrahigh-density optical data storage. The experiment for two-photon recording and reading was carried out by a homemade two-photon scanning microscope developed based on a confocal laser scanning fluoresce microscope. Linearly polarized femtosecond pulsed laser beam with pulse width 80fs, repetition rate 80MHz and wavelength 800nm was used as recording beam. A polarizer and a half-wave plate were used to control the readout beam polarization state. A Ti: sapphire laser at continuous-wave mode was used for readout process. Experimental results of recording and reading data bits with size of 4 microns and interval of 8 microns were presented. An approximatively linearly relationship between excitation power and the readout signal intensity was observed. The great difference between the signals read out by different polarized laser beams provide a multiple-state way to improve storage density.

Paper Details

Date Published: 19 March 2009
PDF: 7 pages
Proc. SPIE 7125, Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage, 71250Y (19 March 2009); doi: 10.1117/12.822238
Show Author Affiliations
Yanlei Hu, Univ. of Science and Technology of China (China)
Zhoushun Zhang, Univ. of Science and Technology of China (China)
Shuangyan Lei, Univ. of Science and Technology of China (China)
Junjun Ding, Univ. of Science and Technology of China (China)
Min Xu, Univ. of Science and Technology of China (China)
Wenhao Huang, Univ. of Science and Technology of China (China)
Qijin Zhang, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 7125:
Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage
Fuxi Gan, Editor(s)

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