Biomedical subjects

Carlos I Mendoza

Publications and source records attributed to Carlos I Mendoza.

3 recordsLinked to original sources

PubMed2005

Geometrical analysis of the electro-optical effect in nematic droplets.

Using the boundary-layer approach, we study the radial-axial transition in a nematic sphere in the presence of an external field. We calculate analytically an asymptotic expression for the nematic configuration subject to an external low frequency field. Then, we consider an incident plane wave crossing a nematic droplet immersed in an isotropic matrix under the presence of a low frequency field. We calculate the ray trajectories within the optical limit for various values of the external field and find the ray deviation as a function of the incident position parametrized by the magnitude of the field.

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PubMed2004

Electrically controlled total internal reflection in nematic hybrid cells.

In this work, we show theoretically how the trajectories of an optical beam propagating in a planar-homeotropic hybrid nematic crystal cell can be modified by applying a low frequency electric field perpendicular to the cell. We use a previously developed formalism for describing the propagation of a polarized beam through the cell. We include a low frequency electric energy for the calculation of the equilibrium orientational configurations of the director's field. The presence of the electric field gives rise to trajectories showing a nontrivial dependence of the beam's range and penetration length with the intensity of the applied electric field.

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PubMed2002

Scattering from supramacromolecular structures.

We study theoretically the scattering imprint of a number of branched supramacromolecular architectures, namely, polydisperse stars and dendrimeric, hyperbranched structures. We show that polydispersity and nature of branching highly influence the intermediate wave vector region of the scattering structure factor, thus providing insight into the morphology of different aggregates formed in polymer solutions.

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