To construct an electronically controllable phase array system in the millimeter-wave region, one needs switches, phase shifters, and modulators which are operable at speeds of ~ 1 nsec and with a time precision of several picoseconds. The only technique possessing this speed capability uses an optically injected electron-hole plasma in a semiconductor waveguide to control the phase shift and attenuation of the millimeter waves. In our early experiments, ultrafast millimeter-wave switching without jitter has been demonstrated with a response time of 40 psec.1 The modulation of millimeter-wave signals at 94 GHz with a repetition rate of ≥200 MHz has also been reported. To design optically controllable millimeter-wave components, it is necessary to understand in detail the behavior of the electron-hole plasma in a semiconductor. For this purpose, we will report on the newly developed techniques which can follow the dynamic evolution of the electron-hole plasma in the semiconductor with excellent time resolution.

© 1984 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription