Characterization of Micro-Powders for the Fabrication of Compression Molded THz Lenses

Scherger, Benedikt; Wietzke, Steffen; Scheller, Maik; Vieweg, N.; Wichmann, Matthias; Koch, Martin; Wiesauer, Karin

doi:10.1007/s10762-011-9806-5

Cited by 22 publications

(6 citation statements)

References 40 publications

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“… 10–12 Exact values of each material’s optical properties vary depending on the manufacturer. 13 While these polymer materials have relatively similar refractive indices, each produces a slightly different profile. In particular, the higher refractive index of HDPE results in a thinner lens design.…”

Section: Lens Designmentioning

confidence: 99%

Design and characterization of telecentric f-θ scanning lenses for broadband terahertz frequency systems

et al. 2020

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Telecentric beam scanning using f- θ lenses offers nearly uniform spot size, linear beam displacement, and normal incidence angle over a planar surface. These unique properties allow for the minimization of imaging distortion over a wide field-of-view. In this article, we present a numerical method for designing custom f- θ lenses in the THz regime. We fabricated three lenses made from different commonly used polymer materials in the THz optics. We demonstrated their optical performance metrics compared to a conventional plano-convex lens over the broadband 0.3 THz–1 THz range. We find that the f- θ lens designed using the optical properties of high-density polyethylene achieved superior performance by maintaining a constant phase over a wide field of view of about 34°. We demonstrate this isophase property by measuring a constant time of arrival of the THz time-domain pulses over a reference mirror with a standard deviation of ∼19 fs, in excellent agreement with simulation predictions. This work will pave the way for the design and implementation of highly precise and fast telecentric imaging systems in the THz frequencies.

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Section: Lens Designmentioning

confidence: 99%

Design and characterization of telecentric f-θ scanning lenses for broadband terahertz frequency systems

et al. 2020

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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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“…The polymer samples made of polyethylene micro powder [2] are fabricated by compression molding. To induce a variation in the density of the samples, they are produced with different pressures lasting on them during the process of compression molding.…”

Section: Sample Preparation and Measurementsmentioning

confidence: 99%

Density effects on dielectric properties of polymers and ceramics in the THz regime

Gente

Scherger

Koch

2012

2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves

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Characterization of Micro-Powders for the Fabrication of Compression Molded THz Lenses

Cited by 22 publications

References 40 publications

Design and characterization of telecentric f-θ scanning lenses for broadband terahertz frequency systems

Design and characterization of telecentric f-θ scanning lenses for broadband terahertz frequency systems

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

Density effects on dielectric properties of polymers and ceramics in the THz regime

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