Photosensitivity and grating development in trans-4-stilbenemethanol-doped poly(methyl methacrylate) materials

JianMing Yu, Xiaoming Tao, Hwa Yaw Tam, DongXiao Yang, M. Suleyman Demokan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

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 by1H NMR spectra of trans-4-stilbenemethanol in CDCL3solvent 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.
Original languageEnglish
Pages (from-to)132-139
Number of pages8
JournalOptics Communications
Volume265
Issue number1
DOIs
Publication statusPublished - 1 Sep 2006

Keywords

  • Grating
  • Lorentz-Lorenz equation
  • Photosensitivity
  • PMMA
  • trans-4-Stilbenemethanol

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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