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The purpose of this research was to find a way and to observe the so-called “backward” collinear acousto-optic (AO) interaction in case of bulk optic and acoustic waves. We found that single crystal germanium is so far one of the best materials to observe the backward interaction in the terahertz (THz) range. This type of diffraction takes place when wave vectors of electromagnetic and acoustic waves are collinear while the diffracted and incident electromagnetic waves propagate in opposite directions. A theoretical analysis of the bulk AO interaction is presented. The model takes into account attenuation of acoustic and electromagnetic waves in the medium. Results of our calculations were used to develop a prototype of a tunable collinear AO filter based on germanium

Backward Collinear Acousto-optic Interaction in Germanium Crystal in Terahertz Spectral Range