Diffractive paper lens for terahertz optics

Siemion, Agnieszka; Makowski, Michał; Suszek, Jarosław; Bomba, Jarosław; Czerwiński, Adam; Garet, Frédéric; Coutaz, Jean‐Louis; Sypek, Maciej

doi:10.1364/ol.37.004320

Cited by 55 publications

(34 citation statements)

References 9 publications

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“…102 A slightly more unusual choice of dielectric material is ordinary cartridge paper, which was stacked to the requisite thickness for a binary phase difference with respect to free-space, which is ∼1.3 mm, and then the zones of lower-delay were defined by laser-cutting. This resulted in a binary-phase zone plate, 103 and the use of cartridge paper, in particular, represents a highly inventive, low-cost demonstration of a terahertz beam-shaping device. A reflective terahertz zone plate has also been demonstrated, in the form of a 3D-printed metal zone plate, with a focal length of 50 mm.…”

Section: Wrapped Phasementioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

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Section: Wrapped Phasementioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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“…For suppressing the absorption in the physical lenses, diffraction lenses with low absorptions are proposed. [75][76][77][78] Ahi and Anwar, 79 Ahi et al 80 have proposed a mathematical algorithm to incorporate the THz imaging features into Gaussian beam theory in order to model the THz point spread function and demerge the merged feature through deconvolution. Chernomyrdin et al 81 have achieved promising resolution enhancement by utilizing solid immersion imaging and wide-aperture spherical lens.…”

Section: Introductionmentioning

confidence: 99%

Review of GaN-based devices for terahertz operation

Ahi

2017

Opt. Eng

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Abstract. GaN provides the highest electron saturation velocity, breakdown voltage, operation temperature, and thus the highest combined frequency-power performance among commonly used semiconductors. The industrial need for compact, economical, high-resolution, and high-power terahertz (THz) imaging and spectroscopy systems are promoting the utilization of GaN for implementing the next generation of THz systems. As it is reviewed, the mentioned characteristics of GaN together with its capabilities of providing high two-dimensional election densities and large longitudinal optical phonon of ∼90 meV make it one of the most promising semiconductor materials for the future of the THz emitters, detectors, mixers, and frequency multiplicators. GaNbased devices have shown capabilities of operation in the upper THz frequency band of 5 to 12 THz with relatively high photon densities in room temperature. As a result, THz imaging and spectroscopy systems with high resolution and deep depth of penetration can be realized through utilizing GaN-based devices. A comprehensive review of the history and the state of the art of GaN-based electronic devices, including plasma heterostructure field-effect transistors, negative differential resistances, hetero-dimensional Schottky diodes, impact avalanche transit times, quantum-cascade lasers, high electron mobility transistors, Gunn diodes, and tera field-effect transistors together with their impact on the future of THz imaging and spectroscopy systems is provided.

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“…Due to our broad experience in designing THz optical elements (broad band double side lenses [18], high-order kinoforms [19], diffractive paper lenses [20], hyperbolical lenses [3], lens-like structures with different focal curves [21,22], different materials can be listed as possible solutions of manufacturing described fan-out elements: paper [20], high-density polyamide-HDPE [18], polyamide 12 -PA12 [3], metal [23] etc. Moreover, depending on used material various manufacturing techniques must be used, like 3D printing [24], milling, laser cutting, etc.…”

Section: Introductionmentioning

confidence: 99%

THz Beam Shaper Realizing Fan-Out Patterns

Liebert

Rachon

Siemion

et al. 2017

J Infrared Milli Terahz Waves

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Fan-out elements create an array of beams radiating at particular angles along the propagation axis. Therefore, they are able to form a matrix of equidistant spots in the far-field diffraction region. In this work, we report on the first fan-out structures designed for the THz range of radiation. Two types of light-dividing fan-out structures are demonstrated: (i) the 3×1 matrix fan-out structure based on the optimized binary phase grating and (ii) the 3×3 fan-out structure designed on the basis of the well-known Dammann grating. The structures were generated numerically and manufactured using the 3D printing technique with polyamide PA12. To obtain equal powers and symmetry of diffracted beams, the computer-aided optimization algorithm was used. Diffractive optical elements designed for 140 and 282 GHz were evaluated experimentally at both these frequencies using illumination with the wavefront coming from the point-like source. Described fan-out elements formed uniform intensity and equidistant energy distribution in agreement with the numerical simulations.

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Diffractive paper lens for terahertz optics

Cited by 55 publications

References 9 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

Review of GaN-based devices for terahertz operation

THz Beam Shaper Realizing Fan-Out Patterns

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