A metasurface-based reflective acoustic holographic imaging method and device

Abstract

The invention provides a reflection-type acoustic holographic imaging device and method based on a meta-surface. The device comprises multiple unit structures, each unit structure is a cubic metal structure, and four sidewalls of the cubic metal structure is a first sidewall, a second sidewall, a third sidewall and a fourth sidewall; the first sidewall of each cubic metal structure is laminated with the second sidewall of the cubic metal structure adjacent to the left side thereof, the second sidewall is laminated with the first sidewall of the cubic metal structure adjacent to the right sidethereof, the third sidewall is laminated with the fourth sidewall of the cubic metal structure adjacent to an upper side thereof, and the fourth sidewall is laminated with the third sidewall of the cubic metal structure at a lower side thereof; the imaging device is characterized in that the internal of the cubic metal structure comprises a first cavity and a second cavity. The whole holographic imaging device is formed through the meta-surface, the construction is simple, and the performance is stable, any regulation and control on the reflected wave phase can be realized, and the imaging device has strong practicability.

Description

technical field [0001] The invention relates to the technical field of acoustic materials, in particular to a metasurface-based reflective acoustic holographic imaging device and method. Background technique [0002] Acoustic imaging and focusing have many important applications in modern science and industry, such as disease diagnosis, oil and gas exploration, seismic source visualization, and particle separation in microfluidics. At present, acoustic imaging and focusing are usually achieved by means of concave mirrors, convex mirrors or wedge-shaped structures, but these structures are often bulky and have limited imaging effects, requiring a large space behind the holographic film so that the influence of phantom imaging has a certain distance from the background. The distance creates a three-dimensional effect. Holographic projection has attracted extensive attention because it can completely record 3D information and realize 3D imaging. Traditional holographic projec...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a reflective acoustic holographic imaging device and method based on metasurfaces. This method solves the defects that the holographic imaging device is too large and the imaging effect is limited in the traditional method, and the performance is stable and can be controlled arbitrarily. Phase, with good development and application potential

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