Optical control of light polarization in heliconical cholesteric liquid crystals

We show here that light polarization of a beam propagating through a heliconical cholesteric cell can be controlled by tuning the Bragg resonance of the structure. We demonstrate that this control is achieved by varying either the low-frequency electric field or the intensity of a pump beam impinging on the sample. The study confirms the recently reported phenomenon of optical tuning of the heliconical cholesterics and opens the door for the development of simple and efficient polarization modulators controlled electrically or optically.

Light-matter interaction induces a shadow vortex

By sending a light beam on a homeotropic nematic liquid-crystal cell subjected to a voltage with a photosensitive wall, a stable matter vortex can be induced at the center of the beam. When the applied voltage is decreased, the vortex disappears from the illuminated region; however, the system shows a stationary molecular texture. Based on a forced Ginzburg-Landau amplitude equation, we show that the vortex with a core of exponentially suppressed amplitude always remains in a shadow region below instability threshold and that the observed texture is induced by its phase distribution. This is a different type of vortex phase singularity solution. Numerical simulations and experimental observations show a quite fair agreement.

Light-matter interaction induces a single positive vortex with swirling arms

Homeotropic nematic liquid crystal cells with a photosensitive wall and negative dielectric anisotropy exhibit, under the influence of local illumination, stable vortexes with swirling arms that are trapped at the illuminated area. Close to the Fréedericksz transition an amplitude equation is derived, which allows us to understand the origin of the induced vortex and the competition between the illuminating profile and the elastic anisotropy generating the swirling of the arms.

Harnessing optical vortex lattices in nematic liquid crystals

By creating self-induced vortexlike defects in the nematic liquid crystal layer of a light valve, we demonstrate the realization of programable lattices of optical vortices with arbitrary distribution in space. On each lattice site, every matter vortex acts as a photonic spin-to-orbital momentum coupler and an array of circularly polarized input beams is converted into an output array of vortex beams with topological charges consistent with the matter lattice. The vortex arrangements are explained on the basis of light-induced matter defects of both signs and consistent topological rules.

Vortex induction via anisotropy stabilized light-matter interaction

By sending circularly polarized light beams onto a homeotropic nematic liquid crystal cell with a photosensitive wall, we are able to locally induce spontaneous matter vortices that remain, each, stable and trapped at the chosen location. We discuss the dual light-matter nature of the created vortices and demonstrate the ability of the system to create optical vortices with opposite topological charges that, consistent with angular momentum conservation, both derive from the same defect created in the liquid crystal texture. Theoretically, we identify a self-stabilizing mechanism for the matter vortex, which is provided by the concurrency of light-induced gradients and anisotropy of the elastic constants that characterize the deformation of the liquid crystal medium.

[Single diverticulum of perforated cecum. Report of 5 cases]

Cecal diverticulitis is a relatively rare disease, which closely mimics the picture of acute appendicitis. At times it is difficult to differentiate from carcinoma. Five cases of cecal diverticulitis are reported, with a discussion of some salient features of this condition. Although two cases were treated with a right hemicolectomy, a plea for conservatism in the treatment of this disease is made.

Effects of phenothiazines on acid secretion in the toad gastric mucosa

The effect of phenothiazine antipsychotic drugs on acid secretion was investigated in the isolated toad gastric mucosa. The acid secretory responses induced by maximal doses of histamine, carbachol and theophylline were all inhibited in a similar fashion by chlorpromazine. The ID50 was between 300 and 600 microM. Histamine-stimulated H+ secretion was also inhibited by trifluoperazine. Soluble cyclic AMP-dependent protein kinase activity was not significantly affected by 300 microM chlorpromazine. Microsomal (H+ + K+)-ATPase activity was significantly reduced by chlorpromazine. The results indicate that phenothiazines can inhibit acid secretion in the toad gastric mucosa and that inhibition of the gastric (H+ + K+)-ATPase may be involved in the mechanism of action.