$spiral diffraction glasses review$

$spiral diffraction glasses review$

Spiral Diffraction Glasses Review

The concept of Bessel beams has been around since Durnin's initial proposal in 1987, and since then, they have been extensively studied in both optics and acoustics. These unique beams possess remarkable properties, including self-healing, beam widths close to the diffraction limit, and excellent depth-of-field.

Bessel functions are exact solutions of the Helmholtz equation, making them ideal for generating diffraction-free beams. In this sense, first-order Bessel beams exhibit a clear phase dislocation along their axis, accompanied by a vortex with single topological charge. Moreover, high-order Bessel beams have been generated using various methods.

To produce these beams, researchers have employed both phase-only holograms and fraxicons, which have shown promising results in generating Bessel beams across a wide range of frequencies. The proposed acoustic holograms have also been compared to 3D-printed fraxicons, demonstrating the effectiveness of both lenses in producing uniform field distributions.

$spiral diffraction glasses review$

$spiral diffraction glasses review$

One of the significant advantages of using Bessel beams is their flat-intensity distribution along their axis, which is not achievable with traditional passive methods. However, these methods often present a common drawback: the axial distribution of the field is not constant, deviating from the ideal characteristics of Bessel beams.

In this study, we experimentally, numerically, and theoretically report acoustic truncated Bessel beams with flat-intensity distributions along their axis in the ultrasound regime using phase-only holograms. Our results demonstrate the generation of zero-th and high-order Bessel beams with broad depth-of-field, showcasing the potential of these beams for various applications, including ultrasonic imaging, biomedical ultrasound, and particle manipulation.

Overall, spiral diffraction glasses have opened up new possibilities for researchers to explore the properties of Bessel beams and their potential applications. This review highlights the significance of this technology and its promising future in various fields.

$spiral diffraction glasses review$

Spiral diffraction glasses review