Advances in Polarizer Technology for Terahertz Frequency Applications

Yan, Fei; Yu, Chunxue; Park, Hong-Kyu; Parrott, Edward P. J.; Pickwell‐MacPherson, Emma

doi:10.1007/s10762-013-0005-4

Cited by 67 publications

(26 citation statements)

References 28 publications

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“…Figure 4 shows the corresponding ER trace in the frequency range between 0.1 and 0.6 THz. The ER reaches up to 20 dB, comparable with results collected in [19]. As expected, it reflects the transmittance behavior in addition to a decay as the wire periodicity becomes of the order of the incoming THz wavelength.…”

Section: Resultssupporting

confidence: 86%

Flexible Sub-THz Metal Wire Grid Polarizer Based on an EGaIn<formula> <tex>$_{24.5}$</tex> </formula> Alloy

Colleoni

Vidal

2016

IEEE Trans. THz Sci. Technol.

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Abstract-A flexible sub-THz polarizer based on an eutectic Gallium-Indium alloy (EGaIn24.5) on a vinyl acetate substrate is fabricated and tested. The EGaIn24.5 alloy shows low melting point, good wettability and high conductivity, resulting in a low cost alternative to conductive inks based on metal nanoparticles. These properties are exploited to draw metal wire grid polarizers by using a technical pen on a bendable sheet of vinyl acetate monomer. Measurements are carried out with a transmission THz-TDS setup in the frequency range from 0.1 to 0.6 THz, showing an Extinction Ratio (ER) up to 20 dB. This approach allows a quick low-tech and cost effective implementation of flexible polarizers in the sub-THz band.Index Terms-terahertz spectroscopy, submillimeter wave polarizer, metal alloy.

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Section: Resultssupporting

confidence: 86%

Flexible Sub-THz Metal Wire Grid Polarizer Based on an EGaIn<formula> <tex>$_{24.5}$</tex> </formula> Alloy

Colleoni

Vidal

2016

IEEE Trans. THz Sci. Technol.

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“…In particular, terahertz linear polarizers and basic polarization selective elements are useful to study (for example) the birefringent properties of materials (such as liquid crystals) and the polarization sensitivity of terahertz sources and detectors [11]. Although a variety of terahertz polarizers have been proposed and developed, the manufacture of a high-performance and robust terahertz polarizer is still challenging [12].Terahertz polarizers can be largely classified into two categories, depending on whether they have mechanical backups: freestanding polarizers (FSPs) and substratebased polarizers (SBPs). The main difference between these two types of polarizers is that FSPs are composed entirely of freestanding grids of metallic wire; in contrast, SBPs are made mechanically rigid through the use of a substrate.…”

mentioning

confidence: 99%

High extinction ratio and low transmission loss thin-film terahertz polarizer with a tunable bilayer metal wire-grid structure

et al. 2014

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A thin-film terahertz polarizer is proposed and realized via a tunable bilayer metal wire-grid structure to achieve high extinction ratios and good transmission. The polarizer is fabricated on top of a thin silica layer by standard micro-fabrication techniques to eliminate the multireflection effects. The tunable alignment of the bilayer aluminum-wire grid structure enables tailoring of the extinction ratio and transmission characteristics. Using terahertz time-domain spectroscopy (THz-TDS), a fabricated polarizer is characterized, with extinction ratios greater than 50 dB and transmission losses below 1 dB reported in the 0.2-1.1 THz frequency range. These characteristics can be improved by further tuning the polarizer parameters such as the pitch, metal film thickness, and lateral displacement.

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“…With a single structure, an ER of only 3 dB is achieved (see Fig. 2(b)) which is far below the required features for a commercial polarizer, that is at least 20 dB [4].…”

Section: Resultsmentioning

confidence: 89%

“…Many efforts are being made in this field to develop THz components that allow the manipulation and control of THz beams. Beam splitters [1], wave plates [2], filters [3] and polarizers [4] are examples of now commercially available THz components. Further work is being carried out to develop robust and durable THz components with better and better performance and, especially, with a lower cost.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the THz response of a simple periodic graphite-based structure

Colleoni¹,

Vidal²

2014

Opt. Express

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Optical Society of America Colleoni, MPM.; Vidal Rodriguez, B. (2014). Analysis of the THz response of a simple periodic graphite-based structure. Optics Express. 22 (24) Abstract: We report the observation of the dichroism effect in simple wire grid structures made of graphite on a paper substrate, i.e. we investigate the feasibility of drawing polarizers for the THz band using conventional graphite-based lead pencils. The displacement of the maximum frequency of the selective absorption phenomenon by varying the wire pitch hints at a polarizing behavior. Measurements of the maximum and minimum of transmission efficiency, extinction ratio and degree of polarization are carried out with a transmission fiber THz-TDS setup. Experimental results show a 9 dB extinction ratio for an inexpensive (<1$) home-made component.

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Advances in Polarizer Technology for Terahertz Frequency Applications

Cited by 67 publications

References 28 publications

Flexible Sub-THz Metal Wire Grid Polarizer Based on an EGaIn<formula> <tex>$_{24.5}$</tex> </formula> Alloy

Flexible Sub-THz Metal Wire Grid Polarizer Based on an EGaIn<formula> <tex>$_{24.5}$</tex> </formula> Alloy

High extinction ratio and low transmission loss thin-film terahertz polarizer with a tunable bilayer metal wire-grid structure

Analysis of the THz response of a simple periodic graphite-based structure

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