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Optically induced mask-controlled time-variable periodic microwave structures

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3 Author(s)
Platte, Walter ; Univ. of the Fed. Armed Forces Hamburg, Germany ; Ruppik, S. ; Guetschow, M.

Based on the distributed Bragg reflection performance of stationary light-induced periodic microwave structures, this paper presents different kinds of modified arrangements for the generation of time-variable plasma gratings. Initial experimental investigations concentrate on the alteration of the grating period as a function of time. It is realized by a photographic film slot-array mask of linearly graded slot width transversely moved across an light-emitting-diode-excited photosensitive coplanar waveguide. The characterization of such a mask-tuned filter configuration requires special measuring procedures, which are illustrated and discussed in detail. The principle of operation demonstrated at X-band frequencies offers the potential of being extended to the submillimeter-wave and low-terahertz ranges

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:48 ,  Issue: 5 )