USA As Represented by Secretary of the Navy

Molecular Biosystems, Inc.

Diane M Szaflarski

Stephen Douglas Russell

Randy L Shimabukuro

Wadad B Dubbelday

Kenneth J Widder

Paul R De La Houssaye

Leslie D Anderson

Janeth M Bartlett

A light emitting photonic structure has a transparent substrate, such as sapphire, supporting a layer of group IV semiconductor material, such as silicon, having at least one porous region from which light is emitted as a response to an electrical or optical stimulus. Optionally, the group IV semiconductor material may be germanium, carbon, tin, silicon-germanium, silicon carbide, single crystal structures, polycrystalline structures, or amorphous structures and the transparent substrate may be glass, quartz, fused silica, diamond, ruby, yttria alumina garnet, yttria stabilized zirconium, magnesium fluoride or magnesium oxide. When the stimulus is electrical, the response is electroluminescence or cathodoluminescence and when the stimulus is optical, the response is photoluminescence. The method includes providing a transparent substrate, forming a layer of a group IV semiconductor material on the transparent substrate, and fabricating at least one region in the layer of the group IV semiconductor material from which light is emitted as a response to a electro- or photo-stimulus. The fabricating of the region is by a photochemical etch by an etching solution and a means to catalyze an etching reaction and may further include an illuminating of the region with light or an other suitable wavelength to provide for a photo-initiated photo-chemical stain etch of the region.

Photonic silicon on a transparent substrate

This invention describes a method of controlling light emission from porous silicon and porous silicon devices using ion implantation. The emitted light intensity can be either selectively increased or decreased by suitable processing of the silicon prior to the fabrication of the porous layer. Amorphizing the silicon prior to the fabrication of the porous layer quenches the light emission. Ion implantation with doses below the amorphization level enhances the intensity of the emitted light of the subsequently fabricated porous layer.

Method of controlling photoemission from porous silicon using ion

A method for enhanced ultrasonic imaging of the tissues defining the gastrointestinal tract and the upper abdominal organs wherein the gastrointestinal tract is filled with a chemically defined essentially sonolucent ultrasound contrast agent that is stable under gastric conditions and has a gastric emptying time of at least about twenty minutes, thus causing the lumen of the upper gastrointestinal tract to appear dark relative to the positive image of the gastrointestinal tract walls and upper abdominal organs.

Method of ultrasonic imaging of the gastrointestinal tract and upper

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San Diego, CA, United States of America

Diane M Szaflarski