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1Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France; 2PRIME Verre, 1350 Albert Einstein Avenue, Montpellier, France
Through the efforts to fuse planar optics and microfluidics in order to produce dye lasers, biosensors, trapping and cell sorting device, we can notice the rising interest in optofluidics since early and mid 2000's. However mass production of these devices heavily relies on fast, and easy patterning of the constituent material. PDMS , being one of these materials, gained an added value because of its elasticity, hydrophobicity and permeability to gaz. Nonetheless, these specifications are not convenient for all types of applications. In addition, the growing capability to use Hybrid Organic-Inorganic materials for the fabrication of integrated optics components and microfluidic channels makes this class of materials an ideal candidate for this integration. This work aims to implement, on the same chip, an optical and a microfluidic layer using Sol-Gel processing of Organic-Inorganic materials. The interest in this vertical integration arises from the need to manipulate the fluid in the microchannels using evanescent field optical pressure.
ID: 145 / OF Posters: 2 Optofluidics
Optical Transport of Fluorescent Diamond Particles inside a Tapered Capillary
Optical forces provide an efficient way to sort particles and biological materials according to their optical properties. However, both enhanced optical forces and a large interaction volume are needed in order to optically sort a large number of nanoparticles. We investigate the use of a tapered glass capillary as an optofluidic platform for optical manipulation and optical sorting applications. Tapered capillaries with micrometre and sub-micrometre sizes are fabricated. After filling the tapered capillary with a colloidal solution of red fluorescent diamond particles, a green laser light is coupled into the capillary. The tapered capillary acts both as a microfluidic channel and as an optical waveguide, making it possible for the light to interact with the particles inside the sample solution. Using an incident laser power of few tens of milliwatts, we achieve optical transportation of the brightest particles inside the tapered part of the capillary. Particle velocities as high as few tens of micrometres per second are measured.
ID: 170 / OF Posters: 3 Optofluidics
Focusing of an Aerosolized Beam of Virus Particles with an Optical Funnel
Salah Seman Awel, Daniel Horke, Richard A. Kirian, Nils Roth, Andrei V.Rode, Jochen Küpper, Henry H. N. Chapman
X-ray free-electron lasers have enabled the possibility of “single particle imaging”, in which the morphology of aerosolized particles may be uncovered through lensless diffractive imaging using intense femtosecond x-ray pulses that “freeze” atomic motion. Diffraction patterns are produced from a stream of particles such as atmospheric aerosol particulates or viruses that are intercepted by x-ray pulses focused to a sub-micrometer spot. In order to enable single-particle imaging, it is necessary to generate high-density particle beams to achieve sufficient diffraction data rates. Here we experimentally demonstrate the feasibility of increasing the density of an aerosolized beam of 300 nm virus particles via the light-induced forces. To achieve this, an optical “funnel” was constructed by re-imaging a first-order quasi Bessel beam, which we used to transversely compress the stream of viruses. We have observed up to a 4-fold increase in the density of particles in the beam.