All-optical switching in an optofluidic polydimethylsiloxane: Liquid crystal grating defined by cast-molding

De Sio, Luciano; Cuennet, Julien G.; Vasdekis, Andreas E.; Psaltis, Demetri
March 2010
Applied Physics Letters;3/29/2010, Vol. 96 Issue 13, p131112
Academic Journal
We report an optofluidic photoswitchable grating, based on a polydimethylsiloxane periodic structure on a glass substrate, separated by a thin liquid crystal film. The polydimethylsiloxane microstructure was realized via high resolution replica molding and was employed to both confine and align a photosensitive nematic liquid crystal. In the absence of any surface treatment, the liquid crystal exhibited homeotropic alignment. By inducing planar alignment on the glass substrate, a hybrid orientation of the liquid crystal was achieved, inducing polarization sensitive transmission. The photosensitivity of the liquid crystal enabled the all-optical control of the grating transmission and 20% diffraction efficiency was measured.


Related Articles

  • Surface ordering near the smectic-A–smectic-C transition in thin, free-standing, liquid-crystal films. Dolganov, V. K.; Demikhov, E. I.; Fouret, R.; Gors, C. // Journal of Experimental & Theoretical Physics;Mar97, Vol. 84 Issue 3, p522 

    Optical reflectivity measurements have been conducted near the smectic-A-smectic-C phase transition in free-standing films with thickness between two and eleven molecular layers. The temperature dependence of the reflectivity in thin film differs significantly from that in thick films. The...

  • Improved steady-state photocarrier grating in nanocrystalline thin films after surface-roughness reduction by mechanical polishing. Bru¨ggemann, R. // Applied Physics Letters;7/27/1998, Vol. 73 Issue 4 

    We detect elastic optical scattering resulting from the surface roughness of nanocrystalline silicon by a poor optical grating in the steady-state photocarrier grating experiment. The small variation of the experimental sampling function reduces the reliability of the ambipolar diffusion length...

  • Synchronized optical and electrical characterization of discotic liquid crystals thin films. Calò, Annalisa; Stoliar, Pablo; Cavallini, Massimiliano; Geerts, Yves H.; Biscarini, Fabio // Review of Scientific Instruments;Mar2010, Vol. 81 Issue 3, p033907 

    We describe a setup suitable for simultaneously measuring optical and electrical properties of a liquid crystal mesophase upon temperature variation, and the difference in the order parameters between the bulk and the interface with the substrate. It integrates high-resolution polarized light...

  • The Light Polarization Control of Self-organized Surface Relief Gratings in an Azo-polymer. KANDJANI, S. AHMADI; BARILLE, R.; DABOS-SEIGNON, S.; NUNZI, J.-M.; ORTYL, E.; KUCHARSKI, S. // Nonlinear Optics, Quantum Optics: Concepts in Modern Optics;2015, Vol. 46 Issue 2-4, p217 

    Self-induced diffraction grating storage in an azo-polymer film is investigated. From the in situ monitoring of self-backward and probe beam diffractions and atomic force microscopy images, the achievement of multistate storage of a single beam polarization and its relaxations are studied. The...

  • Spectroscopic ellipsometry study of liquid crystal and polymeric thin films in visible and near infrared. Tkachenko, V.; Marino, A.; Vita, F.; D'Amore, F.; De Stefano, L.; Malinconico, M.; Rippa, M.; Abbate, G. // European Physical Journal E -- Soft Matter;Jun2004, Vol. 14 Issue 2, p185 

    In this work, we propose spectroscopic ellipsometry as a suitable method for measuring optical properties in soft materials, polymers and liquid crystals, specially selected for use in photonics applications. We show the results of our measurements on some multilayered samples, in the range from...

  • Changes in adsorption and optical properties of liquid crystal langmuir films at structural phase transition. Zaitsev, V.; Levshin, N.; Khlybov, S.; Yudin, S. // Crystallography Reports;Dec2012, Vol. 57 Issue 7, p934 

    The adsorption isotherms of water molecules, absorption spectra, and spectra of diffuse scattering and polarization of reflected light are studied for ultrathin Langmuir films prepared based on liquid crystals. A structural phase transition near 70°C is detected. Some specific features of the...

  • Sensitivity characteristics in nanosized coated long period gratings. Cusano, Andrea; Iadicicco, Agostino; Pilla, Pierluigi; Cutolo, Antonello; Giordano, Michele; Campopiano, Stefania // Applied Physics Letters;11/13/2006, Vol. 89 Issue 20, p201116 

    This work presents an experimental analysis of the sensitivity characteristics to the surrounding refractive index (SRI) in long period gratings coated with polymeric overlay with high refractive index and thickness values ranging in hundreds of nanometers. The presence of the coating induces...

  • Lifetime Measurement of Polarization Gratings in Polymer Thin Films by Spectral Analysis of the Distributed Feedback Laser Emission. GINDRE, DENIS; NUNZI, JEAN-MICHEL; VESPÉRINI, ADRIEN // Nonlinear Optics, Quantum Optics: Concepts in Modern Optics;2015, Vol. 46 Issue 2-4, p207 

    We study the dynamics of the emission spectrum of a distributed Feedback Dye Laser in Rhodamine 6G doped polymer films. The optical feedback is provided by Bragg gratings formed in the film by interference patterns created by the pump beams. In this experiment the sample is pumped by two beams...

  • Light trapping in thin-film silicon solar cells with integrated diffraction grating. Dewan, Rahul; Knipp, Dietmar // Journal of Applied Physics;Oct2009, Vol. 106 Issue 7, p074901-1 

    The optics of microcrystalline silicon thin-film solar cells with integrated light trapping structures was investigated. Periodic grating couplers were integrated in microcrystalline silicon thin-film solar cells and the influence of the grating dimensions on the short circuit current and the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics