Aspheric lenses for terahertz imaging

Lo, Yat Hei; Leonhardt, R.

doi:10.1364/oe.16.015991

Cited by 118 publications

(47 citation statements)

References 6 publications

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“…For each of the fabricated lenses, the focal length was measured to be 35 ± 2 mm. This is consistent with the calculated focal lengths, taking into account the cone angle and radial distance from the optical axis [2]. However, the absorption in these relatively thick optical elements has prevented more thorough optical characterization.…”

Section: Lensessupporting

confidence: 88%

“…7. They are symmetric, ellipticalaspheric, and planar-hyperbolic [2]. For each of the fabricated lenses, the focal length was measured to be 35 ± 2 mm.…”

Section: Lensesmentioning

confidence: 99%

“…Typical terahertz optical elements include lenses and diffraction gratings [1]. Conventionally, optical elements have been made by subtractive methods, such as machining lenses on a lathe [2], or cutting grooves in a A. D. Squires · E. Constable · R. A. Lewis Institute for Superconducting and Electronic Materials and School of Physics University of Wollongong, Wollongong, NSW 2522, Australia Tel. : +61-2-4221-3518 Fax: +61-2-4221-5944 E-mail: ads786@uowmail.edu.au substrate to form a diffraction grating [3,4].…”

Section: Introductionmentioning

confidence: 99%

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3D Printed Terahertz Diffraction Gratings And Lenses

Squires

Constable

Lewis

2014

J Infrared Milli Terahz Waves

112

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Abstract3D printing opens up an inexpensive, rapid, and versatile path to the fabrication of optical elements suited to the terahertz regime. The transmission of the plastics used in 3D printers, while generally decreasing with frequency, is usable over the range 0.1-2 THz. We have designed, fabricated, and tested regular and blazed gratings and aspherical lenses for operation at terahertz frequencies. We find that the measured performance matches our theoretical predictions. Abstract 3D printing opens up an inexpensive, rapid, and versatile path to the fabrication of optical elements suited to the terahertz regime. The transmission of the plastics used in 3D printers, while generally decreasing with frequency, is usable over the range 0.1-2 THz. We have designed, fabricated, and tested regular and blazed gratings and aspherical lenses for operation at terahertz frequencies. We find that the measured performance matches our theoretical predictions. Disciplines Engineering | Science and Technology Studies

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Section: Lensessupporting

confidence: 88%

“…7. They are symmetric, ellipticalaspheric, and planar-hyperbolic [2]. For each of the fabricated lenses, the focal length was measured to be 35 ± 2 mm.…”

Section: Lensesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

3D Printed Terahertz Diffraction Gratings And Lenses

Squires

Constable

Lewis

2014

J Infrared Milli Terahz Waves

112

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show abstract

“…Typical THz optics consist of diffraction gratings, lenses [3], waveguides/ dielectric fibers [4] and prisms [5]. Conventionally, optical elements have been made by subtractive methods, such as machining lenses on a lathe [6], or cutting grooves in a substrate to form a diffraction grating [7,8].…”

Section: Introductionmentioning

confidence: 99%

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

Squires

Lewis

2018

J Infrared Milli Terahz Waves

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Recent years have seen an influx of applications utilizing 3D printed devices in the terahertz regime. The simplest, and perhaps most versatile, modality allowing this is Fused Deposition Modelling. In this work, a holistic analysis of the terahertz optical, mechanical and printing properties of 17 common and exotic 3D printer filaments used in Fused Deposition Modelling is performed. High impact polystyrene is found to be the best filament, with a useable frequency range of 0.1-1.3 THz, while remaining easily printed. Nylon, polylactic acid and polyvinyl alcohol give the least desirable terahertz response, satisfactory only below 0.5 THz. Interestingly, most modified filaments aimed at increasing mechanical properties and ease of printing do so without compromising the useable terahertz optical window. Abstract Recent years have seen an influx of applications utilizing 3D printed devices in the terahertz regime. The simplest, and perhaps most versatile, modality allowing this is Fused Deposition Modelling. In this work, a holistic analysis of the terahertz optical, mechanical and printing properties of 17 common and exotic 3D printer filaments used in Fused Deposition Modelling is performed. High impact polystyrene is found to be the best filament, with a useable frequency range of 0.1-1.3 THz, while remaining easily printed. Nylon, polylactic acid and polyvinyl alcohol give the least desirable terahertz response, satisfactory only below 0.5 THz. Interestingly, most modified filaments aimed at increasing mechanical properties and ease of printing do so without compromising the useable terahertz optical window.

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“…In this context, this paper shows a substantial evolution to the previously published work [6], where a terahertz beam-splitter fabricated from a thin conductive layer-thinner than a skin-depth-was demonstrated with predefined splitting ratios and nearly frequency-independent behaviour over a wide bandwidth. The use of conductive polymers can significantly add capability to this application, and more generally to the development of many terahertz optical devices, which include beam-splitters [7][8][9][10], lenses [11][12][13][14], polarizers [15,16] and waveguides [17][18][19][20]. A current publication has also demonstrated polarizers for the THz range fabricated using conductive polymers [21].…”

Section: Introductionmentioning

confidence: 98%