Abstract:
A system for dispersion compensation in a terahertz system includes an optical fiber configured to transmit an optical pulse, a compensator optically coupled to the optical fiber, the compensator configured to compensate for a dispersion of the optical pulse caused as the optical pulse propagates through the optical fiber, and an optically induced terahertz device optically coupled to the compensator, whereby the optically induced terahertz device is configured to transmit or receive terahertz radiation.
Abstract:
A system for transmitting and receiving electromagnetic radiation includes a beam splitter and a transceiver. The beam splitter is configured to separate an optical pulse into a pump pulse and a probe pulse. The transceiver may include a transmitter switch and a receiver switch. The pump pulse is directed toward the transmitter switch and the probe pulse is directed towards the receiver switch. Electromagnetic radiation is emitted from the transceiver when the pump pulse strikes the transmitter switch. The electromagnetic radiation may be terahertz radiation in either a pulsed or continuous wave form.
Abstract:
A system to detect contraband article, like explosives or chemical weapons in packages, laggage or clothing includes one or more terahertz modules. Each module either generates or receives, or both generates and receives, terahertz radiation. Some of the terahertz radiation is reflected from the article and the remainder of the terahertz radiation is transmitted through the article. A processor analyzes the reflected and transmitted terahertz radiation to characterize the article.
Abstract:
An optical delay line device includes a rotatable wheel and one or more prisms mounted about the circumference of the wheel. The one are more prisms are positioned to retroreflect the optical beam that passes approximately tangent to the wheel to cause a delay or phase shift to the beam as the wheel rotates.
Abstract:
Un sistema para compensar la dispersión en un sistema de terahercios, el sistema comprendiendo: una fibra óptica configurada para transmitir un impulso óptico; un compensador ópticamente acoplado a la fibra óptica, el compensador configurado para compensar una dispersión del impulso óptico causada cuando el impulso óptico se propaga a través de la fibra óptica; un dispositivo de terahercios ópticamente inducido provisto de una antena, el dispositivo de terahercios ópticamente inducido acoplado ópticamente al compensador, por lo que el dispositivo de terahercios está configurado para transmitir o recibir radiación de terahercios a través de la antena; en el que el dispositivo de terahercios ópticamente inducido es un receptor de terahercios, en el que la antena está ópticamente acoplada al compensador para el muestreo del campo eléctrico formado en la antena desde la radiación de terahercios recibida; en el que compensador es una fibra de cristal fotónico, la fibra de cristal fotónico siendo un compensador fijo y el compensador adicionalmente comprende un conversador ajustable conjuntamente con el compensador fijo.
Abstract:
A system for dispersion compensation in a terahertz system includes an optical fiber configured to transmit an optical pulse, a compensator optically coupled to the optical fiber, the compensator configured to compensate for a dispersion of the optical pulse caused as the optical pulse propagates through the optical fiber, and an optically induced terahertz device optically coupled to the compensator, whereby the optically induced terahertz device is configured to transmit or receive terahertz radiation.
Abstract:
A system for dispersion compensation in a terahertz system includes an optical fiber configured to transmit an optical pulse, a compensator optically coupled to the optical fiber, the compensator configured to compensate for a dispersion of the optical pulse caused as the optical pulse propagates through the optical fiber, and an optically induced terahertz device optically coupled to the compensator, whereby the optically induced terahertz device is configured to transmit or receive terahertz radiation.
Abstract:
A system for varying a delay of an optical beam has a rotatable wheel and a set of one or more prisms mounted about a circumference of the rotatable wheel. The set of one or more prisms are positioned to retroreflect the optical beam that passes approximately tangent to the rotatable wheel to cause a delay or phase shift to the beam as the rotatable wheel rotates.
Abstract:
A system for transmitting and receiving electromagnetic radiation includes a beam splitter and a transceiver. The beam splitter is configured to separate an optical pulse into a pump pulse and a probe pulse. The transceiver may include a transmitter switch and a receiver switch. The pump pulse is directed toward the transmitter switch and the probe pulse is directed towards the receiver switch. Electromagnetic radiation is emitted from the transceiver when the pump pulse strikes the transmitter switch. The electromagnetic radiation may be terahertz radiation in either a pulsed or continuous wave form.
Abstract:
Estructura semiconductora fotodetectora que comprende: contactos metálicos (18); un substrato de GaAs o InP (14); una capa epitaxial (12) con crecimiento a baja temperatura no estequiométrica y rica en arsénico de Inx Ga1-x As cuyo crecimiento se ha efectuado sobre el substrato (14), siendo x superior aproximadamente a 0,1 y menor aproximadamente de 0,53; y una capa semiconductora epitaxial con intersticio de banda más amplia con crecimiento en forma de capa de recubrimiento (16) por encima de la capa epitaxial (12) de Inx Ga1-x As, en la que la capa de recubrimiento epitaxial de intersticio de banda más amplia (16) es colocada entre los contactos metálicos (18) y la capa epitaxial (12) de Inx Ga1-x As; en la que la capa de recubrimiento epitaxial de intersticio de banda más amplio (16) tiene un grosor en un rango comprendido aproximadamente entre 5 y 100 nm, en la que la estructura es modelada hasta el substrato excepto en una pequeña plataforma restante en la que se deposita sobre la superficie de la estructura del semiconductor, una película dieléctrica (20) eléctricamente aislante excepto en una zona, que define una ventana centrada sobre la superficie superior de la plataforma, y en la que los contactos metálicos (18) son depositados sobre la película dieléctrica (20) y teniendo un intersticio entre ellos que está posicionado de manera tal que el intersticio y partes de cada electrodo se encuentran en la ventana de la película dieléctrica (20) y hacen contacto con la superficie de la estructura semiconductora superior de la plataforma.