Abstract: A detector for detecting visible and NIR electromagnetic radiation is disclosed. The aforesaid detector comprises: (a) a substrate made of conventional temperature grown semi-insulating gallium arsenide (GaAs); (b) an active layer; and (c) means for applying electric fields to the active layer. The active layer is made of low temperature grown semi-insulating GaAs or made of ion implanted conventional temperature grown semi insulating GaAs. Also disclosed an imager based on monolithically integrated array of detectors and read-out integrated circuit (ROIC).

Abstract: Provided is a device and method for detecting the presence of a material in a gaseous medium, including a reaction assembly including at least one detection unit including a matrix adapted for exposure to the gaseous medium, such that at least part of the gaseous medium comes into contact with the matrix; the matrix being configured for capturing a gas-born particle of a material carried by the gaseous medium, and for permitting a liquid or solute reagent to come in contact with the matrix, thereby enabling said liquid reagent to react with said particle to yield an optically altered reaction product.

Abstract: Provided is a device and method for detecting the presence of a material in a gaseous medium, including a reaction assembly including at least one detection unit including a matrix adapted for exposure to the gaseous medium, such that at least part of the gaseous medium comes into contact with the matrix; the matrix being configured for capturing a gas-borne particle of a material carried by the gaseous medium, and for permitting a liquid or solute reagent to come in contact with the matrix, thereby enabling said liquid reagent to react with said particle to yield an optically altered reaction product.