Jump to main content
Jump to site search

Issue 10, 2013
Previous Article Next Article

Azo doped polymer thin films for active and passive optical power limiting applications

Author affiliations

Abstract

Two novel optical power limiters, 2-[ethyl-(4-phenylazo-phenyl)-amino]-ethanol (E4PA) and 2-[ethyl-(4-trifluoromethyl-phenylazo-phenyl)-amino]-ethanol (E4TPA) were synthesized using a diazotization reaction. The purified azo material was made into thin films in a poly(methyl methacrylate) matrix using a gravity settling technique. The electronic nonlinearities of these films were investigated using an open aperture Z-scan technique in the fs excitation regime, resulting in nonlinear absorption due to a two-photon absorption (2PA) process. The 2PA coefficient for these films is of the order 10−12 m W−1 and the limiting threshold values are 1.1 J cm−2 each. A non-degenerate pump probe set-up was employed with CW lasers to study the nonlinear behaviour arising from photo-induced anisotropy and excited-state absorption. The present study shows that these azo thin films are potential candidates for active and passive optical power limiting applications.

Graphical abstract: Azo doped polymer thin films for active and passive optical power limiting applications

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Feb 2013, accepted on 13 May 2013 and first published on 14 May 2013


Article type: Paper
DOI: 10.1039/C3PP50065A
Photochem. Photobiol. Sci., 2013,12, 1780-1786

  •   Request permissions

    Azo doped polymer thin films for active and passive optical power limiting applications

    B. Rajashekar, S. Limbu, K. Aditya, G. Nageswara Rao and S. Siva Sankara Sai, Photochem. Photobiol. Sci., 2013, 12, 1780
    DOI: 10.1039/C3PP50065A

Search articles by author

Spotlight

Advertisements