Research Papers

Electric-field enhancement and modulation of permanent grating diffraction in dye and carbon nanotube-doped liquid crystal

[+] Author Affiliations
Mikail E. Abbasov, Gene O. Carlisle

Physics, West Texas A&M University, 2403 Russell Long Blvd., Canyon, Texas 79016

J. Nanophoton. 2(1), 023510 (November 7, 2008). doi:10.1117/1.3037329
History: Received August 16, 2008; Revised October 31, 2008; Accepted November 3, 2008; November 7, 2008; Online November 07, 2008
Text Size: A A A

Abstract

Permanent gratings were written, without the aid of external fields, in planar nematic liquid crystal cells doped with only Methyl Red (MR) as well as cells doped with both Methyl Red and single-wall carbon nanotubes (CNTs). Grating formation based on trans-cis photoisomerism of MR followed by surface adsorption of the cis-isomer was attempted. The diffraction efficiency was easily enhanced and modulated by application of ac fields covering wide ranges of frequency and voltage; thus, allowing for tuning the diffracted signals. Cells doped with MR and CNTs had a maximum relative diffraction efficiency of 67% while cells doped only with MR exhibited a maximum of 28%. The maximum diffraction efficiency appears to be associated with the Fre´edericksz threshold voltage. The permanent gratings are robust and have remained stable for over two years.

© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Mikail E. Abbasov and Gene O. Carlisle
"Electric-field enhancement and modulation of permanent grating diffraction in dye and carbon nanotube-doped liquid crystal", J. Nanophoton. 2(1), 023510 (November 7, 2008). ; http://dx.doi.org/10.1117/1.3037329


Figures

Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.