Design of Binary-Sequence Zone Plates in High Wavelength Domains

Area of Science:

• Physics
• Acoustics
• Optics

Background:

• Zone plate design is critical in optics, X-rays, microwaves, and ultrasonics.
• Existing methods offer limited flexibility in shaping focusing profiles.

Purpose of the Study:

• To analyze a flexible zone plate design method using binary sequences.
• To extend the applicability of this method to high wavelength domains.

Main Methods:

• Utilizing binary sequences to generate zone plates with tailored properties.
• Introducing a modification term to adapt the design for high wavelengths.
• Simulating acoustic focusing profiles for various zone plate types.

Main Results:

• The binary sequence method provides high flexibility in focusing profile shaping.
• The method is accurate at low wavelengths and, with modification, at high wavelengths.
• Simulations demonstrated distortion-free acoustic focusing for Fresnel, Fibonacci, and Cantor zone plates at 1.5 mm wavelength.

Conclusions:

• The binary sequence design method is a powerful tool for creating zone plates with specific focusing characteristics.
• The modification term ensures the method's accuracy across a broad spectrum of wavelengths.
• This generalized approach enhances the utility of zone plates in diverse scientific and technological fields.