Transport in Heterostructures and Device in Microwave and Millimeter Wave Regimes

摘要

All modern high-fields (several hundred kilovolt/cm). The relevant time constantsinvolved in, the carrier transport are typically in the subpicosecond domain. Under the URI contract, with techniques based on ultrashort laser pulses, we have studied the dynamics of carriers in the 100-1000 GHz regime in bulk, low-temperature grown, and quantum-size semiconductors. In addition, because of the relevance of high-speed electronics, we have studied the carrier dynamics in high Tc superconductors in the same frequency regime. During the course of the URI a number of technological innovations have been demonstrated and have found their way to the commercial world. The URI is at the origin of two spin-off companies, Medox Research and Picotronix, now selling products first demonstrated in our laboratories. Also a license is being granted to a laser company to develop a laser amplifier product demonstrated during the course of the URI last year. It is important to note that the URI has helped to originate a large grant from NSF that was awarded to our group to pursue and expand our activity in the ultrafast science and technology domain.