Surface relief grating formation in liquid-crystalline side-chain azopolymers by femtosecond pulse holography
- Quantum Photonic Science Research Center and Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of)
Surface relief gratings were inscribed in the liquid-crystalline side-chain (LCSC) azopolymers using two-beam interference of near-infrared femtosecond laser pulses. The LCSC azopolymer films were prepared using acrylate-based homo- and copolymers with the azobenzene group in the side chain. The LC properties of the polymers were confirmed by differential scanning calorimetry and optical polarizing microscopy. By adjusting the writing conditions to the optimum fluence, highly efficient gratings were fabricated. This phenomenon is ascribed to a fact that the multiphoton absorption-induced photoisomerization facilitates the parallel ordering of LC mesogenic side groups and the grating formation. Even after the writing beams are removed, the grating relaxation hardly occurs. Such a very slow relaxation might be due to the collective behavior of aligned LC mesogenic side groups in the domain.
- OSTI ID:
- 20713900
- Journal Information:
- Journal of Applied Physics, Vol. 97, Issue 9; Other Information: DOI: 10.1063/1.1879080; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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