Ph. Coquet

Positioning living cells on a high-density electrode array by negative dielectrophoresis

We present in this paper a large-scale microelectrode array, which allows a dielectrophoretic positioning of cells in a matrix form. The electrode structure was chosen to produce regularly spaced field minima, toward which particles are directed and concentrated, under conditions of negative DEP. The need to power thousands of electrodes at the same time guided the choice of a multilayer structure. Cells can also be directed toward small wells formed in silicon, where they remain when the field is removed.

Study of Fabry-Perot Cavities with Metal Mesh Mirrors Using Equivalent Circuit Models. Comparison with Experimental Results in the 60 GHz Band

The equivalent circuit modelling technique is used to study the resonant frequency and Q factor of plane parallel Fabry-Perot cavities with square aperture metal mesh mirrors. Comparison of different models found in literature with experimental data in the 60 GHz band is given for thin and thick cavities. Chens model is shown to give a good agreement with measurements, as long as the cavity is not too selective and for large enough cavity.

Theoretical Reflection Coefficient of Metal Grid Reflectors at a Dielectric Interface

Reflection properties of square apertures metal mesh mirrors are studied theoretically with the Finite-Difference Time-Domain (FDTD) method associated to Floquet Boundary Conditions. The reflector is illuminated by a normally incident plane wave and is located at an interface between two semi infinite low loss dielectric materials. Reflectivity and phase of the reflection coefficient are given in the non diffraction region for a wide range of square apertures, and for the four situations corresponding to an interface between free space and fused quartz.