Optical modulation of terahertz pulses in a parallel plate waveguide.
In this work we present a technique for optically modulating a terahertz pulse inside a parallel plate waveguide. A novel semiconductor filled waveguide is formed by coating both sides of a thin, high resistivity silicon slab with a transparent conducting oxide. While the waveguide is intrinsically lossy due to the low conductivity of the oxides, it permits photoexcitation through the plates, generating free carriers within the silicon that modulates the terahertz pulse transmission. We demonstrate this modulation by observing the Drude response of photoexcited carriers within the silicon in a narrow strip inside the waveguide.
Cooke
D G
DG
Department of Photonics Engineering, DTU Fotonik, Technical University of Denmark, Building 343 Ørsteds Plads, 2800 Kgs Lyngby, Denmark. dcoo@fotonik.dtu.dk
Jepsen
P Uhd
PU
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D008872:Microwaves; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D012666:Semiconductors; D013685:Telecommunications / Q000295:instrumentation*