Terahertz Sieves

Machado, Federico; Zagrajek, Przemysław; Monsoriu, Juan A.; Furlan, Walter D.

doi:10.1109/tthz.2017.2762292

Cited by 8 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, we design, manufacture and experimentally validate a PR-FZP lens, which design is inspired in a phase-reversal zone plate 25 . The PR-FZP, originally developed for electromagnetic waves, has been used as an antenna in the range of microwave and millimeter wave regions 26,27 , and more recently as THz sieves for optical focusing applications 28 . Knowing that we can extend the results obtained for electromagnetic waves to acoustic waves, an acoustic PR-FZP has been designed to increase the energy efficiency compared to conventional FZPs.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Tarrazó-Serrano

Pérez-López

Candelas

et al. 2019

Sci Rep

View full text Add to dashboard Cite

The development of flat acoustic lenses for different applications such as biomedical engineering is a topic of great interest. Flat lenses like Fresnel Zone Plates (FZPs) are capable of focusing energy beams without the need of concave or convex geometries, which are more difficult to manufacture. One of the possible applications of these type of lenses is tumor ablation through High Intensity Focused Ultrasound (HIFU) therapies with real time Magnetic Resonance Imaging (MRI) monitoring. In order to be MRI compatible, the FZP material cannot have electromagnetic interaction. In this work, a Phase-Reversal FZP (PR-FZP) made of Polylactic Acid (PLA) manufactured with a commercial 3D printer is proposed as a better, more efficient and MRI compatible alternative to conventional Soret FZPs. Phase-Reversal lenses, unlike traditional FZPs, take advantage of all the incident energy by adding phase compensation regions instead of pressure blocking regions. The manufactured PR-FZP achieves 21.9 dB of focal gain, which increases the gain compared to a Soret FZP of its same size by a factor of 4.0 dB. Both numerical and experimental results are presented, demonstrating the improved focusing capabilities of these types of lenses.

show abstract

Section: Introductionmentioning

confidence: 99%

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Tarrazó-Serrano

Pérez-López

Candelas

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Not only a typical diffractive design is of interest to researchers. The structure composed of various holes located on every other structure zone, called a THz sieve, can successfully focus the radiation both in amplitude and phase coding [ 75 ]. Moreover, good focusing properties were obtained by using a subwavelength concentric ring structure array.…”

Section: Efficient Focusing Of Thz Radiationmentioning

confidence: 99%

The Magic of Optics—An Overview of Recent Advanced Terahertz Diffractive Optical Elements

Siemion

2020

Sensors

View full text Add to dashboard Cite

Diffractive optical elements are well known for being not only flat but also lightweight, and are characterised by low attenuation. In different spectral ranges, they provide better efficiency than commonly used refractive lenses. An overview of the recently invented terahertz optical structures based on diffraction design is presented. The basic concepts of structure design together with various functioning of such elements are described. The methods for structure optimization are analysed and the new approach of using neural network is shown. The paper illustrates the variety of structures created by diffractive design and highlights optimization methods. Each structure has a particular complex transmittance that corresponds to the designed phase map. This precise control over the incident radiation phase changes is limited to the design wavelength. However, there are many ways to overcome this inconvenience allowing for broadband functioning.

show abstract

“…Due to the evolution of these devices in the mid-1980s, however, terahertz radiation has attracted much more attention. Since this part of the spectrum is between the infrared (IR) and microwave frequency ranges, the development of waveguides [1][2][3][4][5][6], filters [7,8], polarizers [9,10], lenses [11,12], and other optical components benefits from the well-established technologies [13][14][15]. The characteristic of terahertz waves to penetrate most dielectric materials offers the possibility of many applications.…”

Section: Introductionmentioning

confidence: 99%

3D Printed Hollow-Core Terahertz Fibers

Cruz

Cordeiro

Franco

2018

Fibers

View full text Add to dashboard Cite

This paper reviews the subject of 3D printed hollow-core fibers for the propagation of terahertz (THz) waves. Several hollow and microstructured core fibers have been proposed in the literature as candidates for low-loss terahertz guidance. In this review, we focus on 3D printed hollow-core fibers with designs that cannot be easily created by conventional fiber fabrication techniques. We first review the fibers according to their guiding mechanism: photonic bandgap, antiresonant effect, and Bragg effect. We then present the modeling, fabrication, and characterization of a 3D printed Bragg and two antiresonant fibers, highlighting the advantages of using 3D printers as a path to make the fabrication of complex 3D fiber structures fast and cost-effective.

show abstract

Terahertz Sieves

Cited by 8 publications

References 22 publications

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

The Magic of Optics—An Overview of Recent Advanced Terahertz Diffractive Optical Elements

3D Printed Hollow-Core Terahertz Fibers

Contact Info

Product

Resources

About