Abstract: A layered structure used for detecting incident light includes a substrate having a surface with a high Miller index crystal orientation and a superlattice structure formed over the substrate at the surface. The superlattice structure is aligned to the high Miller index crystal orientation and exhibits a red-shifted long wave infrared response range based on the crystal orientation as compared to a superlattice structure formed over a substrate at a surface with a (100) crystal orientation.

Abstract: An optoelectronic device includes an Sb-based metamorphic photodetector grown over a silicon substrate via a buffer layer. The device includes a layered structure. The layered structure can include a silicon substrate, a buffer layer formed over the Si substrate, and an infrared photodetector formed over the buffer layer. In some embodiments, the buffer layer includes a composite buffer layer having sublayers. For example, the composite buffer layer includes a Ge-based sublayer formed over the substrate, a III-As sublayer grown over the Ge-based sublayer, and a III-Sb sublayer formed over the III-As sublayer.

Abstract: A layered structure used for detecting incident light includes a substrate having a surface with a high Miller index crystal orientation and a superlattice structure formed over the substrate at the surface. The superlattice structure is aligned to the high Miller index crystal orientation and exhibits a red-shifted long wave infrared response range based on the crystal orientation as compared to a superlattice structure formed over a substrate at a surface with a (100) crystal orientation.

Abstract: An optoelectronic device includes an Sb-based metamorphic photodetector grown over a silicon substrate via a buffer layer. The device includes a layered structure. The layered structure can include a silicon substrate, a buffer layer formed over the Si substrate, and an infrared photodetector formed over the buffer layer. In some embodiments, the buffer layer includes a composite buffer layer having sublayers. For example, the composite buffer layer includes a Ge-based sublayer formed over the substrate, a III-As sublayer grown over the Ge-based sublayer, and a III-Sb sublayer formed over the III-As sublayer.

Abstract: An animal management system includes a beacon, a radio animal tag configured to monitor the proximity of the animal tag to the beacon, and a reader configured to read information from the animal tag.

Abstract: An RFID system provides a transponder having a power store that can be recharged when located within an electro-magnetic field generated by a transceiver unit. The power store can be a battery and/or a capacitor. In certain embodiments, the transponder can communicate over at least two different frequencies so that the real time performance of the transponder can be improved without losing backwards compatibility. The system provides an ear tag for use on livestock with superior durability and overall performance in the field.

Abstract: An animal management system includes a beacon, a radio animal tag configured to monitor the proximity of the animal tag to the beacon, and a reader configured to read information from the animal tag.

Abstract: An animal management system includes a beacon, a radio animal tag configured to monitor the proximity of the animal tag to the beacon, and a reader configured to read information from the animal tag.

Abstract: An RFID system provides a transponder having a power store that can be recharged when located within an electromagnetic field generated by a transceiver unit. The power store can be a battery and/or a capacitor. In certain embodiments, the transponder can communicate over at least two different frequencies so that the real time performance of the transponder can be improved without losing backwards compatibility. The system provides an ear tag for use on livestock with superior durability and overall performance in the field.

Abstract: An animal management system includes a beacon, a radio animal tag configured to monitor the proximity of the animal tag to the beacon, and a reader configured to read information from the animal tag.

Abstract: The invention is directed to an improved RFID system. The system provides a tag having a power management unit that selectively powers a transmission unit to transmit at least a first signal having a first frequency. The tag can be configured to transmit a second signal having a second frequency as well. The power management unit selectively powers the transmission unit based on the level of power stored in the tag, a duty cycle associated with the tag, or a combination of the two.