  Conventional sonic crystal (SC) devices designed for acoustic imaging can
focus acoustic waves from an input source into only one image but not
multi-images. Furthermore the output position of formed image cannot be
designed at will. In this paper, we propose the hybrid SC imaging devices to
achieve multi-images from one-source-input along with the designable
image-positions. The proposed hybrid devices can image acoustic waves radiated
both from point source and Gaussian beam, which different from conventional SC
imaging devices that only applies to point source. These multi-functional but
still simple and easy-to-fabricate devices are believed to find extensive
applications, particularly in ultrasonic photography and compact acoustic
imaging.
