Generation of three equal-intensity foci based on a modified composite zone plate

Xia, Tian; Cheng, Shubo; Tao, Shaohua

doi:10.1016/j.ijleo.2018.01.071

Cited by 21 publications

(11 citation statements)

References 16 publications

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“…Zone plate as another type of planar diffractive lens has found many applications in optics [29], x-ray microscopy [30,31], THz optics [32] and microwaves [33], and it can also be used to focus sound waves [34][35][36][37][38]. To overcome the high chromatic aberration of Fresnel zone plate (FZP), several aperiodic zone plates such as fractal zone plates [39][40][41][42] and Thue-Morse zone plates [43,44] have been proposed, which produce an extended depth of field by the fractal structure of their foci. However, their focal intensity is lower than that of FZPs because part of the energy is distributed among the multiple subsidiary foci [42].…”

Section: Introductionmentioning

confidence: 99%

Achromatic acoustic generalized phase-reversal zone plates

Zou

Wang

2022

New J. Phys.

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We report an achromatic acoustic generalized phase-reversal zone plate by harnessing the response of dipole and monopole, which eliminate the chromatic aberration of conventional zone plates. The focusing properties of the proposed metalens are compared with that of the conventional Soret-type Fresnel zone plate (FZP) in both experiments and simulations. Due to the combination of the phase-reversal characteristic and the tunable transmission phase induced by dipole and monopole, an achromatic high efficient focusing is confirmed by experiment in the frequency range from $3350$ to $3950\rm{Hz}$, with the focal intensity of achromatic metalens being approximately twice that of Soret-type FZP. The proposed achromatic metalens has potential applications in the broad field of acoustics, such as imaging and energy harvesting.

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Section: Introductionmentioning

confidence: 99%

Achromatic acoustic generalized phase-reversal zone plates

Zou

Wang

2022

New J. Phys.

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“…If Fibonacci or M-bonacci binary sequences are employed, the resulting lens achieves a bifocal focusing profile [ 21 , 22 , 23 ], while if fractal Cantor binary sequences are used, multifocal focusing profiles with interesting self-similarity properties are achieved [ 24 , 25 , 26 , 27 ]. Analogously, binary Thue–Morse sequences provide focusing profiles with bifocal fractal properties [ 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications

Fuster

Pérez-López

Belmar

et al. 2021

Sensors

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In this work, we analyze the effect of predistortion techniques on the focusing profile of Fresnel Zone Plates (FZPs) in ultrasound applications. This novel predistortion method is based on either increasing or decreasing the width of some of the FZP Fresnel rings by a certain amount. We investigate how the magnitude of the predistortion, as well as the number and location of the predistorted rings, influences the lens focusing profile. This focusing profile can be affected in different ways depending on the area of the lens where the predistortion is applied. It is shown that when the inner area of the lens, closer to its center, is predistorted, this technique allows the control of the focal depth at the main focus. However, when the predistortion is applied to an area farther from the center of the lens, the acoustic intensity distribution among the main focus and the closest adjacent secondary foci can be tailored at a certain degree. This predistortion technique shows great potential and can be used to control, modify and shape the FZP focusing profile in both industrial and therapeutic applications.

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“…For instance, using a Fibonacci binary mask results in a bifocal profile with two equal-intensity foci [ 19 , 20 , 21 ], while using fractal Cantor sequences provides a focusing profile with interesting self-similarity multifocal properties [ 22 , 23 , 24 , 25 ]. Thue–Morse binary sequences combine both effects and provide focusing profiles with bifocal fractal properties [ 26 , 27 ]. Thus, the use of binary sequences is very appealing in the design of SZPs, because they provide high versatility in the design of the focusing profile, allowing us to tailor it to the required application.…”

Section: Introductionmentioning

confidence: 99%

On the Design of Soret Zone Plates Based on Binary Sequences Using Directional Transducers

Candelas

Pérez-López

Fuster

2021

Sensors

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In this work, we analyze the effect of the distribution of transparent Fresnel regions over the focusing profile of Soret Zone Plates (SZP) based on binary sequences. It is shown that this effect becomes very significant in those fields where directional transducers are employed, such as microwaves or acoustics. A thorough analysis of both the SZP transmission efficiency and the focusing enhancement factor is presented. Moreover, experimental measurements are also carried out for a particular type of binary sequence, the Cantor ternary set, validating the theoretical model and demonstrating that the distribution of transparent Fresnel regions becomes a critical parameter in applications requiring directional emitters.

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Generation of three equal-intensity foci based on a modified composite zone plate

Cited by 21 publications

References 16 publications

Achromatic acoustic generalized phase-reversal zone plates

Achromatic acoustic generalized phase-reversal zone plates

Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications

On the Design of Soret Zone Plates Based on Binary Sequences Using Directional Transducers

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