Liquid crystal optofluidics

By employing anisotropic fluids and namely liquid crystals, fluid flow becomes an additional degree of freedom in designing optofluidic devices. In this paper, we demonstrate optofluidic liquid crystal devices based on the direct flow of nematic liquid crystals in microfluidic channels. Contrary to previous reports, in the present embodiment we employ the effective phase delay acquired by light travelling through flowing liquid crystal, without analysing the polarisation state of the transmitted light. With this method, we demonstrate the variation in the diffraction pattern of an array of microfluidic channels acting as a grating. We also discuss our recent activities in integrating mechanical oscillators for on-chip peristaltic pumping.

[1]  D. Psaltis,et al.  Silicon oxide deposition for enhanced optical switching in polydimethylsiloxane-liquid crystal hybrids. , 2011, Optics express.

[2]  Demetri Psaltis,et al.  Optofluidic modulator based on peristaltic nematogen microflows , 2011 .

[3]  D. Mcgloin,et al.  Optically written optofluidic ice channels , 2011 .

[4]  Anders Kristensen,et al.  UV patterned nanoporous solid-liquid core waveguides. , 2010, Optics express.

[5]  A. deMello,et al.  Optofluidic platforms based on surface-enhanced Raman scattering. , 2010, The Analyst.

[6]  Youn Sang Kim,et al.  Delicate modification of poly(dimethylsiloxane) ultrathin film by low-energy ion beam treatment for durable intermediate liquid crystal pretilt angles. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[7]  A. Bausch,et al.  Diffusive spreading of time-dependent pressures in elastic microfluidic devices. , 2010, Lab on a chip.

[8]  D. Psaltis,et al.  All-optical switching in an optofluidic polydimethylsiloxane: Liquid crystal grating defined by cast-molding , 2010 .

[9]  D. Psaltis,et al.  Microfluidic assays for DNA manipulation based on a block copolymer immobilization strategy. , 2010, Biomacromolecules.

[10]  Byoungho Lee,et al.  Electrically programmable nematofluidics with a high level of selectivity in a hierarchically branched architecture. , 2010, Chemphyschem : a European journal of chemical physics and physical chemistry.

[11]  A. E. Vasdekis,et al.  Surface optofluidics , 2010, NanoScience + Engineering.

[12]  J. Sambles,et al.  Flow-driven transition and associated velocity profiles in a nematic liquid-crystal cell. , 2009, Physical review. E, Statistical, nonlinear, and soft matter physics.

[13]  Demetri Psaltis,et al.  Optofluidic evanescent dye laser based on a distributed feedback circular grating , 2009 .

[14]  Demetri Psaltis,et al.  Low-order distributed feedback optofluidic dye laser with reduced threshold , 2009 .

[15]  M. Lipson,et al.  Optical manipulation of nanoparticles and biomolecules in sub-wavelength slot waveguides , 2009, Nature.

[16]  Pietro Ferraro,et al.  Liquid micro-lens array activated by selective electrowetting on lithium niobate substrates. , 2008, Optics express.

[17]  A. Kristensen,et al.  Optofluidic tuning of photonic crystal band edge lasers , 2007 .

[18]  Thomas F. Krauss,et al.  Silicon based organic semiconductor laser , 2007 .

[19]  Christelle Monat,et al.  Integrated optofluidics: A new river of light , 2007 .

[20]  S. Shojaei-Zadeh,et al.  Role of surface anchoring and geometric confinement on focal conic textures in smectic-A liquid crystals. , 2006, Langmuir : the ACS journal of surfaces and colloids.

[21]  V. Chigrinov,et al.  Oscillating Poiseuille flow in photo‐aligned liquid crystal cells , 2006 .

[22]  D. Psaltis,et al.  Developing optofluidic technology through the fusion of microfluidics and optics , 2006, Nature.

[23]  Yeshaiahu Fainman,et al.  On-chip microfluidic tuning of an optical microring resonator , 2006 .

[24]  A. M. Jorgensen,et al.  Lab-on-a-chip with integrated optical transducers. , 2006, Lab on a chip.

[25]  Luke P. Lee,et al.  Optofluidic control using photothermal nanoparticles , 2006, Nature materials.

[26]  George M. Whitesides,et al.  Integrated fluorescent light source for optofluidic applications , 2005 .

[27]  Myung Chul Choi,et al.  Ordered patterns of liquid crystal toroidal defects by microchannel confinement. , 2004, Proceedings of the National Academy of Sciences of the United States of America.

[28]  Peter G. LoPresti,et al.  Dynamics of picosecond laser‐induced density, temperature, and flow‐reorientation effects in the mesophases of liquid crystals , 1991 .

[29]  N. V. Madhusudana,et al.  Optical determination of large distortion surface anchoring torques in a nematic liquid crystal , 1984 .