Paper Title:
Self-Assembled Optical Gratings with Banana-Shaped Liquid Crystals
  Abstract

We demonstrated that a homologous series of banana-shaped liquid crystals, 1,3-phenylene bis(4-alkyloxybenzylideneamine), could assemble themselves into various kinds of groove-free diffraction gratings when their isotropic melts were slowly cooled into mesophases between two pieces of glass substrates. The groove-free diffraction gratings included one-dimensional parallel gratings, two-dimensional crossed gratings, two-dimensional fan-shaped gratings and two-dimensional circular gratings. Characterization by means of polarized optical microscopy showed that a pattern of periodic modulation of the refractive index was developed in the thin films formed by the banana-shaped compound. Our laser light diffraction experiments confirmed that these groove-free gratings could effectively diffract the incident red light from a helium-neon laser. On the basis of the diffraction equations derived for the self-assembled groove-free optical gratings, the diffraction patterns were simulated for the parallel gratings, orthogonally crossed gratings, fan-shaped gratings and circular gratings, respectively, and good agreement was achieved. The mechanisms on the self-assembly of the banana-shaped molecules were discussed in terms of intermolecular interactions. Our work provides an alternative method for manufacturing diffraction gratings by harnessing the self-assembly of banana-shaped molecules.

  Info
Periodical
Key Engineering Materials (Volumes 428-429)
Edited by
Yuan Ming Huang
Pages
12-23
DOI
10.4028/www.scientific.net/KEM.428-429.12
Citation
Y. M. Huang, "Self-Assembled Optical Gratings with Banana-Shaped Liquid Crystals", Key Engineering Materials, Vols. 428-429, pp. 12-23, 2010
Online since
January 2010
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Price
$32.00
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