Fabrication of terahertz wire-grid polarizers

Partanen, Anni; Väyrynen, J.; Hassinen, S.; Tuovinen, Hemmo; Mutanen, Jarkko; Itkonen, Tommi; Silfsten, P.; Pääkkönen, Pertti; Kuittinen, Markku; Mönkkönen, Kari; Venäläinen, Tapani

doi:10.1364/ao.51.008360

Cited by 24 publications

(13 citation statements)

References 12 publications

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“…Polarizers are essential components in THz imaging, communications, and spectroscopy. Wire-grid polarizers are simpler to realize in the THz than in the visible region [96]. Recently, reconfigurable polarizers in [97] and carbon nanotube fiber polarizers in [98] have been reported.…”

Section: B the Thz Componentsmentioning

confidence: 99%

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Ren

Zahid

Fan

et al. 2019

Trends in Food Science & Technology

119

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Past few years have witness a dramatic change in the field of terahertz (THz) technology. The recent advancements in the technology for generation, manipulation and detection exploiting THz radiation have brought revolution in the field. Many researchers around the world have been inspired by the potential of invaluable new applications of THz sensing for food and water contamination detection. The microbial pollution in water and food is one the crucial issues with regard to the sanitary state for drinking water and daily consumption of food. To address this risk, the detection of microbial contamination is of utmost importance since the consumption of insanitary or unhygienic food can lead to catastrophic illness. This paper presents a first-time review of the open literature focused on the advances in the THz sensing for microbiological contamination of food and water and state-of-theart network architectures, applications, industrial trends and recent developments. Finally, open challenges and future research directions are presented with in the field.

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Section: B the Thz Componentsmentioning

confidence: 99%

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Ren

Zahid

Fan

et al. 2019

Trends in Food Science & Technology

119

View full text Add to dashboard Cite

show abstract

“…Recently, nanomaterials such as carbon nanotubes (CNTs) have been used to fabricate FSPs with higher extinction ratios (∼37 dB for 0.1-2.0 THz), at the cost of larger transmission losses (≥3 dB) and both fragile construction and expensive production processes [13]. In contrast, SBPs are mechanically robust due to the presence of a supporting substrate, and many types are available, including liquid crystal polarizers [14], Brewster angle reflection polarizers [15,16], and supported CNT [17] and wire grid polarizers [18][19][20]. Recently, SBPs based upon dual-layer-etched Si substrates and sinusoidal subwavelength metallic thin films supported by a Tsurupica substrate have been reported [21,22].…”

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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“…Fig. 2(b) shows the extinction ratio of the structures (ER = 10log 10 T ⊥ T [19]), where ⊥ and refer to the TM and TE polarization, respectively. With a single structure, an ER of only 3 dB is achieved (see Fig.…”

Section: Resultsmentioning

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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Fabrication of terahertz wire-grid polarizers

Cited by 24 publications

References 12 publications

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

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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