High order kinoforms as a broadband achromatic diffractive optics for terahertz beams

Suszek, Jarosław; Siemion, Agnieszka; Blocki, Narcyz; Makowski, Michał; Czerwiński, Adam; Bomba, Jarosław; Kowalczyk, Adam; Ducin, Izabela; Kakarenko, Karol; Pałka, Norbert; Zagrajek, Przemysław; Kowalski, Marcin; Czerwińska, Elżbieta; Jastrzębski, Cezariusz; Switkowski, Krzysztof; Coutaz, Jean‐Louis; Kołodziejczyk, Andrzej; Sypek, Maciej

doi:10.1364/oe.22.003137

Cited by 23 publications

(15 citation statements)

References 27 publications

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“…8b) to focus the radiation into Fourier plane instead of Fraunhofer diffraction region. This lens was HDPE lens that was previously designed and was a high order kinoform [19] having the focal length equal to 300 mm and the diameter equal to 300 mm. Thus, the Fourier plane was located at a distance of 300 mm behind the converging lens (where the scanning plane was).…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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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Section: Resultsmentioning

confidence: 99%

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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“…The precision of currently available additive manufacturing allows 3-D printing of diffractive [13,14] and sub- wavelength structures for longer wavelengths of the THz range [15,16]. We were able to imprint pyramid-like structures directly on top of the slab in order to form the variable distribution of the effective refractive index.…”

Section: Design and Fabrication Of Thz Anti-reflection Coatingsmentioning

confidence: 99%

3-D Printed Anti-Reflection Structures for the Terahertz Region

Bomba

Suszek

Makowski

et al. 2017

J Infrared Milli Terahz Waves

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Terahertz radiation has a growing number of applications in material characterization, where spectral fingerprinting and diffractive effects are the carriers of information. On the other hand, electromagnetic waves in the range of millimeters exhibit strong unwanted specular reflections, resulting in uncontrolled interferences. This problem is especially disturbing in the goniometric time-domain spectroscopy (TDS) configuration, where angular distribution of the field modified by the sample is altered by unwanted reflections. For this reason, low-cost anti-reflection layers are desired. Here, we present a simple way of designing and manufacturing one-sided and two-sided anti-reflection polyamide layers for the THz range. The structures were fabricated using 3-D printers based on selective laser sintering. We demonstrate experimentally in the goniometric time-domain spectroscopy the significant reduction of wavelength-dependent oscillations in Fabry-Perot configuration in the range between 0.1 and 0.3 THz. We also examine the influence of the anti-reflection layers on the distribution of THz energy in reflected, transmitted, and diffracted fields. MotivationTerahertz radiation has been the subject of growing attention because of its unique properties: non-ionizing nature, good transmission through many non-metallic media, and the possibilities of spectral fingerprinting of various materials, including hazardous ones. THz beams are used in numerous areas, including medicine, telecommunication, and security systems. In most of

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“…For diffractive elements, various structures complicated in shape are available (they can be easily manufactured with different 3D printing techniques, laser cutting, or even with milling but only for axially symmetrical structures). Such elements strongly depend on the design wavelength, but this drawback can be suppressed by clever designing [5].…”

Section: Introductionmentioning

confidence: 99%

Paper on Designing Costless THz Paper Optics

Siemion

Kostrowiecki-Lopata

Pindur

et al. 2016

Advances in Materials Science and Engineering

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Designing diffractive optical elements is crucial for efficient development of THz techniques. Here, we consider paper structures and we analyze their advantages and disadvantages in fast prototyping. The discussion about using material parameters like refractive index and absorption coefficient in designing diffractive optical elements is shown. We analyze the influence of phase step mismatch, of attenuation of real structure, and of nonuniform illumination on the efficiency of the structure. All these features result in worsening of the diffraction efficiency but they do not seem to have such significant influence as shadow effect introduced by fast varying zones. Diffractive elements can be designed with very good accordance with experimental results which makes them ideal for possible applications. Paper optics scan be used more for fast prototyping; nevertheless its performance can be increased by placing it inside water protecting foil.

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High order kinoforms as a broadband achromatic diffractive optics for terahertz beams

Cited by 23 publications

References 27 publications

THz Beam Shaper Realizing Fan-Out Patterns

THz Beam Shaper Realizing Fan-Out Patterns

3-D Printed Anti-Reflection Structures for the Terahertz Region

Paper on Designing Costless THz Paper Optics

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