Journal
SENSORS
Volume 18, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/s18082604
Keywords
zone plates; focusing; lenses; binary sequences
Funding
- Spanish MINECO [TEC2015-70939-R]
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The design of zone plates is an important topic in many areas of physics, such as optics, X-rays, microwaves or ultrasonics. In this paper, a zone plate design method, which provides high flexibility in the shaping of the focusing profile, is analyzed. This flexibility is achieved through the use of binary sequences that produce zone plates with different properties and applications. It is shown that this binary-sequence method works properly at low wavelengths, but requires a modification term to work accurately in high wavelength domains. This additional term extends this powerful design method to any wavelength. Simulation results show acoustic focusing profiles for Fresnel, Fibonacci and Cantor zone plates operating at a wavelength of 1.5 mm without any distortion.
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