SURFACE ACOUSTIC WAVE BASED PHOTOSENSITIVE FILTER Russian patent published in 2012 - IPC H01P1/205 

FIELD: physics.

SUBSTANCE: in the photosensitive filter, the working surface of a plate (1) is coated with a dielectric coating (2) which is not transparent to optical radiation and having rectangular windows which are transparent for optical radiation, lying in an acoustic channel, wherein one of said windows and parts of the irradiated plate (1) form fingers of the input converter (3), and the other windows serve as process windows for depositing film-type interdigitated-finger electrodes of the output converter (4). The spacing of the windows of the input converter (3) is equal to the spacing of the fingers of the interdigitated-finger electrodes of the output converter (4).

EFFECT: low level of acoustic losses in the substrate during operation of the filter and high Q factor of the filter.

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