Mesogenic versus non-mesogenic azo dye confined in a soft-matter template for realization of optically switchable diffraction gratings

We report on fabrication and characterization of two different kinds of optically controlled diffraction gratings realized in soft composite materials. The periodic microstructures have been obtained by combining a photolithographic technique and a chemical etching process. The samples have been infiltrated with two classes of photosensitive materials, and then characterized. The first material is a common azo-dye dissolved in a liquid crystal (LC), while the second one is an azobenzene LC (azo-LC). The response and relaxation times, lifetimes and spectral absorption range of the LC mixtures confined in the microstructures were measured. Detailed comparison of investigated characteristics reveals a better overall performance of the azo-LC based sample.

[1]  A. De Luca,et al.  In situ optical control and stabilization of the curing process of holographic gratings with a nematic film-polymer-slice sequence structure. , 2006, Applied optics.

[2]  Giuseppe Strangi,et al.  Universal soft matter template for photonic applications , 2011 .

[3]  Nelson V. Tabiryan,et al.  Wide Temperature Range Azobenzene Nematic and Smectic LC Materials , 2006 .

[4]  All-optical switching of holographic gratings made of polymer-liquid-crystal-polymer slices containing azo-compounds , 2008 .

[5]  R. Caputo,et al.  Characterization of the diffraction efficiency of new holographic gratings with a nematic film-polymer-slice sequence structure , 2004 .

[6]  Guangbin Dong.  Recent advances in the total synthesis of agelastatins , 2010 .

[7]  Haiping Yu,et al.  Optically switchable liquid crystal photonic structures. , 2004, Journal of the American Chemical Society.

[8]  Iam-Choon Khoo,et al.  Supra Optical Nonlinearities (SON) of Methyl Red- and Azobenzene Liquid Crystal - Doped Nematic Liquid Crystals , 2001 .

[9]  Tomiki Ikeda,et al.  Optical Switching and Image Storage by Means of Azobenzene Liquid-Crystal Films , 1995, Science.

[10]  T K Gaylord,et al.  Thin and thick gratings: terminology clarification. , 1981, Applied optics.

[11]  Richard A. Vaia,et al.  Relationship between the Photomechanical Response and the Thermomechanical Properties of Azobenzene Liquid Crystalline Polymer Networks , 2010 .

[12]  Masanao Sato,et al.  A photoresponsive liquid crystal based on (1-cyclohexenyl)phenyldiazene as a close analogue of azobenzene. , 2009, Chemical communications.

[13]  R. Klajn.  Immobilized azobenzenes for the construction of photoresponsive materials , 2010 .

[14]  H. Kogelnik.  Coupled wave theory for thick hologram gratings , 1969 .

[15]  W. Urbach,et al.  On the application of forced Rayleigh light scattering to mass diffusion measurements , 1985 .

[16]  Kevin G. Yager,et al.  Novel photo-switching using azobenzene functional materials , 2006 .

[17]  Cesare Umeton,et al.  Composite Holographic Gratings Containing Light‐Responsive Liquid Crystals for Visible Bichromatic Switching , 2010, Advanced materials.

[18]  I. Khoo.  Nonlinear optics of liquid crystalline materials , 2009 .

[19]  Landa Hoke,et al.  Azobenzene liquid crystalline materials for efficient optical switching with pulsed and/or continuous wave laser beams. , 2010, Optics express.

[20]  S. Serak,et al.  Systematic Study of Absorption Spectra of Donor–Acceptor Azobenzene Mesogenic Structures , 2008 .

[21]  Luogen Deng,et al.  Nonlinear optical limiting of the azo dye methyl-red doped nematic liquid crystalline films , 2003 .