Apparatus and method for creating a holographic ultrasound field in an object

An ultrasonic apparatus, being configured for creating a holographic ultrasound field, comprising

• an ultrasound source device being configured for creating an ultrasound wave, and
• a transmission hologram device having a transmission hologram and an outer acoustic emitter surface, said transmission hologram device being coupled with the ultrasound source device and being arranged for transmitting the ultrasound wave through the outer acoustic emitter surface and creating the holographic ultrasound field in a surrounding space, wherein
• the transmission hologram is a structured component which has a holographic surface facing to the outer acoustic emitter surface and a hologram phase structure being determined by a shape of the holographic surface and extending perpendicular relative to a propagation direction of the ultra-sound wave and being capable of an interaction with the wave-front of the ultrasound wave such that the phases and/or amplitudes across the wave-front are specifically changed by the structure of the transmission hologram and the holographic ultrasound field is generated by diffraction and self-interference of the ultrasound wave after the interaction,
• the holographic surface is covered by a sonic coupling layer comprising a flowable embedding material which has an acoustic impedance differing from the acoustic impedance of the transmission hologram,
• a flexible cover sheet covers the embedding material and provides the outer acoustic emitter surface, and
• the outer acoustic emitter surface is a smooth surface, which is capable of transmitting the ultrasound wave without changing the radial phase and/or amplitude distribution of the ultrasound wave.