| 摘要 |
<p>A controllable polarizer for terahertz radiation, the polarizer comprising a polariser plate 21, the polarizer plate comprising a plurality of nanowires or nanotubes disposed on a substrate that is generally transparent to terahertz (thz) radiation, and a control element 22, the control element including a light source 30 such as a laser diode and a controller 24, the control element is operable to illuminate 25 the polarizer plate 21 to selectively photoexcite the nanowires. Photoexcited nanowires block incident terahertz radiation 27 that has an axis of polarisation parallel to the long axis of the nanowires A. Due to the rapid switching capability of the laser diode this arrangement can be used in the field of communication</p> |
