Abstract
Zone plate lenses are used in many areas of physics where planar geometry is advantageous in comparison with conventional curved lenses. There are several types of zone plate lenses, such as the well-known Fresnel zone plates (FZPs) or the more recent fractal and Fibonacci zone plates. The selection of the lens material plays a very important role in beam modulation control. This work presents a comparison between FZPs made from different materials in the ultrasonic range in order to use them as magnetic resonance imaging (MRI) compatible materials. Three different MRI compatible polymers are considered: Acrylonitrile butadiene styrene (ABS), polymethyl methacrylate (PMMA) and polylactic acid (PLA). Numerical simulations based on finite elements method (FEM) and experimental results are shown. The focusing capabilities of brass lenses and polymer zone plate lenses are compared.
Highlights
The development of modulating and focusing energy systems has been a field of study of great interest for scientist and engineers
Non-metallic materials can be used for the construction of acoustic lenses
It has been possible to verify that the higher the impedance contrast of the materials, the higher the intensity gain levels
Summary
The development of modulating and focusing energy systems has been a field of study of great interest for scientist and engineers. The lens is a devices that is able to perform this energy modulation. Lenses allow beam forming, control propagation and focusing the energy that impinges on them. These effects are produced by refractive and diffractive phenomena. Transmission efficiency is one of the most important aspects, when low impedance contrast is presented between the lens and the host medium. Due to the wide versatility of the lenses, they have been used in different areas
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