Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13766
Title: Photosensitivity and grating development in trans-4-stilbenemethanol-doped poly(methyl methacrylate) materials
Authors: Yu, J
Tao, X 
Tam, H 
Yang, D
Demokan, MS
Keywords: Grating
Lorentz-Lorenz equation
Photosensitivity
PMMA
Trans-4-Stilbenemethanol
Issue Date: 2006
Publisher: North-Holland
Source: Optics communications, 2006, v. 265, no. 1, p. 132-139 How to cite?
Journal: Optics communications 
Abstract: This paper reports the photosensitivity of poly(methyl methacrylate) (PMMA) and its copolymer doped with trans-4-stilbenemethanol. UV irradiation of the doped-PMMA at 325 nm induced the trans- to cis-isomerization of the dopant. This process was confirmed by 1H NMR spectra of trans-4-stilbenemethanol in CDCL3 solvent before and after irradiation. The isomerization can be initiated by the irradiation with an intensity of 0.62 mW/cm2. Photo-induced refractive index change of -0.0024 was obtained when a PMMA copolymer film doped with 5.1 wt% dopant was exposed to 325 nm light. Lorentz-Lorenz equation was used to estimate the refractive index of a trans-4-stilbenemethanol-PMMA composite and a trans-4-stilbenemethanol-PMMA copolymer composite from the mole refraction and van der Waals volume of each component. A slight elevation of molecular packing coefficient (K) for PMMA and its copolymer containing the dopant implies a denser aggregation as compared to the polymer without the dopant. Long period gratings were created in doped-PMMA films and doped-PMMA copolymer fibers using amplitude mask technique. Gratings were confirmed by microscopic observation and diffraction patterns.
URI: http://hdl.handle.net/10397/13766
ISSN: 0030-4018
EISSN: 1873-0310
DOI: 10.1016/j.optcom.2006.03.029
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