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...

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Bibliographic Details
Published in:Optics express 2008-09, Vol.16 (19), p.15123-15129
Main Authors: Cooke, D G, Jepsen, P Uhd
Format: Article
Language:English
Subjects:
Computer Simulation
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Infrared Rays
Microwaves
Models, Theoretical
Optics and Photonics - instrumentation
Semiconductors
Telecommunications - instrumentation
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.16.015123