3D-printed diffractive elements induced accelerating terahertz Airy beam

Liu, Changming; Niu, Liting; Wang, Kejia; Liu, Jinsong

doi:10.1364/oe.24.029342

Cited by 41 publications

(21 citation statements)

References 28 publications

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“…7c). Such two structures are able to create [101] airy beam with diffraction-free distance reported to be equal to 100 mm [101]. Moreover, if a part of the diffractive element has been covered by metal foil, a very similar diffractive pattern has been observed, and thus the authors report "healing" property of such distribution (Fig.…”

Section: Advanced Diffractive Optical Elementsmentioning

confidence: 84%

Terahertz Diffractive Optics—Smart Control over Radiation

Siemion

2019

J Infrared Milli Terahz Waves

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Over the last 20 years, thin and lightweight optical elements have become very desirable, especially for the terahertz (THz) range. Reduction of the volume of optical elements alongside an increase in their effective efficiency has begun a new direction of research leading to many practical applications. On top of that, diffractive optical elements can not only focus the incident beam, but also can shape the incoming wavefront into a desirable distribution or can redirect the energy. Starting from theoretical calculations of Fourier optics, diffractive elements have been transformed and nowadays form complicated structures that do not resemble a typical Fresnel lens. The precise control over a phase shift introduced by the designed element creates an opportunity to almost freely transform an incident wavefront. Moreover, the vast diversity of computer-generated holograms (also called synthetic) contributes substantially to this topic. Diffractive elements have a great impact on THz optical systems because their manufacturing is very simple in comparison with any other range of radiation (infrared, visible, ultraviolet, etc.). This review paper underlines developments in evolution of diffractive optics and highlights main principles and technological approaches for fabrication of diffraction optics within the terahertz range, thus serving as a guide to design and production considerations.

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Section: Advanced Diffractive Optical Elementsmentioning

confidence: 84%

Terahertz Diffractive Optics—Smart Control over Radiation

Siemion

2019

J Infrared Milli Terahz Waves

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“…Thus, it could be a challenge to demonstrate the radially symmetric Airy beams in the THz domain. With our previous work 24–27 , we believe that the 3D printing technology may offer a suitable way to achieve the goal of efficiently manipulating the THz wave with complex phase patterns.…”

Section: Introductionmentioning

confidence: 98%

Terahertz circular Airy vortex beams

Liu

Niu

et al. 2017

Sci Rep

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Vortex beams have received considerable research interests both in optical and millimeter-wave domain since its potential to be utilized in the wireless communications and novel imaging systems. Many well-known optical beams have been demonstrated to carry orbital angular momentum (OAM), such as Laguerre-Gaussian beams and high-order Bessel beams. Recently, the radially symmetric Airy beams that exhibit an abruptly autofocusing feature are also demonstrated to be capable of carrying OAM in the optical domain. However, due to the lack of efficient devices to manipulate terahertz (THz) beams, it could be a challenge to demonstrate the radially symmetric Airy beams in the THz domain. Here we demonstrate the THz circular Airy vortex beams (CAVBs) with a 0.3-THz continuous wave through 3D printing technology. Assisted by the rapidly 3D-printed phase plates, individual OAM states with topological charge l ranging from l = 0 to l = 3 and a multiplexed OAM state are successfully imposed into the radially symmetric Airy beams. We both numerically and experimentally investigate the propagation dynamics of the generated THz CAVBs, and the simulations agree well with the observations.

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“…On the other hand diffractive THz optical elements have been proposed and tested [7,8]. In spite of their lower light throughput and chromatic aberration, diffractive lenses can have high numerical aperture [9], and permit beam shaping [10,11], working in linear and compact setups. Therefore, in many applications, the performance of diffractive THz lenses is better than that of their refractive homologous.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in many applications, the performance of diffractive THz lenses is better than that of their refractive homologous. Additionally, 3D printing technology has also been used recently to construct special designs of diffractive lenses [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Sieves

Machado

Zagrajek

Monsoriu

et al. 2018

IEEE Trans. THz Sci. Technol.

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Imaging at terahertz (THz) frequencies offers a great potential for applications including: security screening, telecommunications biodetection, and spectroscopy. Some of these applications need specially designed lenses with customized characteristics that are not commercially available. In this work we present the THz sieves as a new kind of THz lenses. We demonstrate that these lenses improve the resolution of conventional zone plates constructed with the same level of detail. Amplitude and phase THz sieves were 3-D printed and tested experimentally. Excellent agreement was obtained between the experimental and calculated results.

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3D-printed diffractive elements induced accelerating terahertz Airy beam

Cited by 41 publications

References 28 publications

Terahertz Diffractive Optics—Smart Control over Radiation

Terahertz Diffractive Optics—Smart Control over Radiation

Terahertz circular Airy vortex beams

Terahertz Sieves

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