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Applied Optics

Applied Optics


  • Vol. 42, Iss. 29 — Oct. 10, 2003
  • pp: 5918–5927

Photoinduced anisotropy in a family of amorphous azobenzene polyesters for optical storage

Lian L. Nedelchev, Avtar S. Matharu, Søren Hvilsted, and P. S. Ramanujam  »View Author Affiliations

Applied Optics, Vol. 42, Issue 29, pp. 5918-5927 (2003)

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We investigate parameters associated with optical data storage in a variety of amorphous side-chain azobenzene-containing polyesters denoted as E1aX. The polyesters possess a common cyano-substituted azobenzene chromophore as a side chain, but differ in their main-chain polyester composition. Seventeen different polymers from the E1aX family divided into four classes, depending on the type of the main-chain substituent (one-, two-, and three-ring aromatic or alicyclic) have been thoroughly investigated. Various parameters characterizing the photoinduced birefringence in these materials, such as the response time, thermal and light stability, and long-term stability under ambient light at room temperature have been measured. Each of these parameters is quantitatively represented and therefore it is possible to make a clear comparison between the properties of the polymers. The results indicate that the long-term stability at ambient temperature is closely related to the thermal stability of the photoinduced birefringence. A strong correlation has also been found between the response time and the stability of the induced anisotropy toward illumination with unpolarized white light. One of the classes of E1aX polymers characterized by two-ring aromatic substituent in the main chain is a good candidate for optical data storage media. A recording energy of approximately 2 J/cm2 is sufficient to induce high refractive-index modulations of Δn = 0.13 in these materials, which is retained even at elevated temperatures (>130 °C). Long-term stability of greater than one year for the induced anisotropy has also been achieved.

© 2003 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(160.4890) Materials : Organic materials
(160.5470) Materials : Polymers
(210.4810) Optical data storage : Optical storage-recording materials
(260.1440) Physical optics : Birefringence
(260.5130) Physical optics : Photochemistry

Original Manuscript: January 17, 2003
Revised Manuscript: June 25, 2003
Published: October 10, 2003

Lian L. Nedelchev, Avtar S. Matharu, Søren Hvilsted, and P. S. Ramanujam, "Photoinduced anisotropy in a family of amorphous azobenzene polyesters for optical storage," Appl. Opt. 42, 5918-5927 (2003)

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  1. T. Todorov, L. Nikolova, N. Tomova, “Polarization holography 1.: A new high efficiency organic material with reversible photoinduced birefringence,” Appl. Opt. 23, 4309–4312 (1984). [CrossRef] [PubMed]
  2. M. Eich, J. H. Wendorff, “Erasable holograms in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 467–471 (1987). [CrossRef]
  3. S. Hvilsted, F. Andruzzi, C. Kulinna, H. W. Siesler, P. S. Ramanujam, “Novel side-chain liquid crystalline polyester architecture for reversible optical storage,” Macromolecules 28, 2172–2183 (1995). [CrossRef]
  4. L. Nedelchev, L. Nikolova, A. Matharu, P. S. Ramanujam, “Photoinduced macroscopic chiral structures in a series of azobenzene copolyesters,” Appl. Phys. B 75, 671–676 (2002). [CrossRef]
  5. A. Hassner, L. Krepski, V. Alexanian, “Aminopyridines as acylation catalysts for tertiary alcohols,” Tetrahedron 34, 2069–2076 (1978). [CrossRef]
  6. A. Kerekes, E. Lörincz, P. S. Ramanujam, S. Hvilsted, “Light scattering of thin azobenzene side-chain polyester layers,” Opt. Commun. 206, 57–65 (2002). [CrossRef]
  7. P. Rochon, E. Batalla, A. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995). [CrossRef]
  8. D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995). [CrossRef]
  9. P. S. Ramanujam, N. C. R. Holme, S. Hvilsted, “Atomic force and optical near-field microscopic investigations of polarization holographic gratings in a liquid crystalline azobenzene side-chain polyester,” Appl. Phys. Lett. 68, 1329–1331 (1996). [CrossRef]
  10. H. Ono, N. Kowatari, N. Kawatsuki, “Holographic grating generation in thick polymer films containing azo dye molecules,” Opt. Mater. 17, 387–394 (2001). [CrossRef]
  11. W. Joo, C. Oh, Y. Han, “Influence of the backbone on photoinduced birefringence in a poly(malonic ester) containing p-cyanoazobenzene,” J. Phys. Chem. B 106, 5378–5381 (2002). [CrossRef]
  12. M. Hasegawa, T. Ikawa, M. Tsuchimori, O. Watanabe, “Photochemically induced birefringence in polyurethanes containing donor-acceptor azobenzenes as photoresponsive moieties,” J. Appl. Polym. Sci. 86, 17–22 (2002). [CrossRef]
  13. M. S. Ho, A. Natansohn, P. Rochon, “Azo polymers for reversible optical storage: 7. The effect of the size of the photochromic groups,” Macromolecules 28, 6124–6127 (1995). [CrossRef]
  14. N. C. R. Holme, P. S. Ramanujam, S. Hvilsted, “Photoinduced anisotropy measurements in liquid-crystalline azobenzene side-chain polyesters,” Appl. Opt. 35, 4622–4627 (1996). [CrossRef] [PubMed]
  15. Linkam TMS ’93 Reference Manual (Linkam Scientific Instruments Ltd., No. 8 Epsom Donors Metro Centre, Waterfield, Tadworth, Surrey 5T20 5HT, UK), p. 6.
  16. R. H. Romer, Energy: An Introduction to Physics (W. H. Freeman, San Francisco, Calif., 1976) pp. 520, 578–579 (1976).
  17. J. Darnell, M. Jefferson, eds., New Renewable Resources: A Guide to the Future;…(World Energy Council, Kogan Page Ltd., London, 1994), p. 65.
  18. E. Lörincz, G. Szarvas, P. Koppa, F. Ujhelyi, G. Erdei, A. Sütö, P. Várhegyi, Sz. Sajti, Á. Kerekes, T. Ujvári, P. S. Ramanujam, “Polarization holographic data storage using azobenzene polyester as storage material,” in Organic Photonic Materials and Dences V, J. G. Grote, T. Kaino, eds., Proc. SPIE4991 (to be published).

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