Terahertz plastic compound lenses

Wichmann, Matthias; Mondol, Abdullah Saif; Kocic, Nikola; Lippert, Sina; Probst, T.; Schwerdtfeger, Michael; Schumann, Steffen; Hochrein, Thomas; Heidemeyer, Peter; Bastian, Martin; Bastian, G.; Koch, Martin

doi:10.1364/ao.52.004186

Cited by 26 publications

(9 citation statements)

References 30 publications

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“…Polymer terahertz lenses are also detailed in the literature, having been fabricated with techniques including compression molding and machining. [80][81][82] These devices operate over a broad bandwidth due to the non-dispersive nature of the polymers employed. Focal lengths from 7 to 60 mm were demonstrated, and the thickness of these devices was up to 15 mm, which is quite large compared to a terahertz wavelength.…”

Section: A Traditional Implementationmentioning

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: A Traditional Implementationmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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“…This can be realized by novel technical approaches and production techniques for terahertz system components and therefore for the overall system. Examples are the use of inexpensive polymer compounds instead of silicon for beam splitters or lenses [62,63] as well as low-cost telecom and fiber components for optical terahertz systems, which operate at 1.5 μm laser wavelengths [55]. Novel concepts for excitation of photoconductive antennas by low cost multimode laser diodes can significantly reduce the costs in quasi time-domain terahertz spectrometers as well [64][65][66].…”

Section: Price Trendmentioning

confidence: 99%

Markets, Availability, Notice, and Technical Performance of Terahertz Systems: Historic Development, Present, and Trends

Hochrein

2014

J Infrared Milli Terahz Waves

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Although a lot of work has already been done under the older terms "far infrared" or "sub-millimeter waves", the term "terahertz" stands for a novel technique offering many potential applications. The latter term also represents a new generation of systems with the opportunity for coherent, time-resolved detection. In addition to the well-known technical opportunities, an historical examination of Internet usage, as well as the number of publications and patent applications, confirms ongoing interest in this technique. These activities' annual growth rate is between 9 % and 21 %. The geographical distribution shows the center of terahertz activities. A shift from the scientific to more application-oriented research can be observed. We present a survey among worldwide terahertz suppliers with special focus on the European region and the use of terahertz systems in the field of measurement and analytical applications. This reveals the current state of terahertz systems' commercial and geographical availability as well as their costs, target markets, and technical performance. Component cost distribution using the example of an optical pulsed time-domain terahertz system gives an impression of the prevailing cost structure. The predication regarding prospective market development, decreasing system costs and higher availability shows a convenient situation for potential users and interested customers. The causes are primarily increased competition and larger quantities in the future.

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“…Profiles or pipes, for example, can be improved by reinforcing materials in the outer layer or equipped with a high concentration of UV and longterm stabilizers at the surface exposed to the weather. Furthermore, the production of waveguides or optics by adjustable refractive indices, for example for microwave or terahertz applications [8,9], profiles with color gradients for individual designs, graded resistance with conductive core and increasingly insulating outer layer or profiles with antimicrobial equipped surfaces for handrails are conceivable as well. Thus, the challenging manufacturing process of plastic profiles with adjustable radial gradation obtained by means of an extrusion tool will be scientifically investigated.…”

Section: Introductionmentioning

confidence: 99%

New extrusion process for manufacturing radial functionally graded polymer materials

Hoffmann

Rudloff

Lang

et al. 2016

AIP Conference Proceedings

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Abstract. Usually additives, fillers and reinforcing materials are homogeneously distributed in plastic profiles when they have undergone conventional extrusion processes. However, in many applications it would be advantageous to place these substances in sufficient quantities where required by the subsequent application of the profile. This is where functionally graded materials start from since they have no homogeneous composition or distribution of fillers along one dimension. These materials have different compositions along the part's cross-section based on its application. Nowadays functionally graded materials are already used in various material combinations, e.g. metal and ceramic, for special applications such as aerospace, nuclear energy and chemistry. The production of functionally graded materials on a purely polymeric basis is only possible under laboratory conditions or with discontinuous processes so far. For this reason, the SKZ is currently developing an innovative continuous extrusion process for radial functionally graded polymer materials. The produced round profiles of two polymers display a smooth radial transition between the two components over the part's cross-section and a homogeneous composition in the extrusion direction. This can be achieved by using a rotating mask in the melt flow, which forms a spiral layer structure and a subsequent concentric mixing by a rotating cluster in the flow channel.

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Terahertz plastic compound lenses

Cited by 26 publications

References 30 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

Markets, Availability, Notice, and Technical Performance of Terahertz Systems: Historic Development, Present, and Trends

New extrusion process for manufacturing radial functionally graded polymer materials

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