Flexible polarization‐dependent absorbers based on patterned carbon nanotubes films

Danlée, Yann; Bailly, Christian; Huynen, Isabelle

doi:10.1002/mop.30496

Cited by 7 publications

(7 citation statements)

References 20 publications

(34 reference statements)

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“…Furthermore, it is imperative to develop a new type of polarizing film applicable to flexible and stretched substrates. A wire‐grid‐type polarizing (WGP) film based on a conductive nanowire developed through a bottom‐up method can be a good alternative to solve the issue of the conventional method . A WGP has a structure in which fine parallel metal wires are arranged in a plane.…”

supporting

confidence: 92%

Flexible and Thermally Stable Optical Polarizers Based on Highly Aligned Carbon Nanotube Sheets for the Visible Spectral Range

Jung

Noh

Suh

et al. 2018

Adv Materials Technologies

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Development of new types of optical components applicable to flexible and stretched substrates is essential for designing innovative display platforms for wearable and outdoor applications. Here, a novel polarizer based on highly aligned macroscopic carbon nanotube (CNT) sheets with flexibility, thermal stability, high polarization efficiency, and high transmittance is introduced. Since the conductive multiwalled CNTs are essentially held together by van der Waals forces, wire‐grid‐type polarizers of well‐aligned conductive CNTs in one direction can be developed without complex and difficult manufacturing processes. The CNT sheet exhibits uniform polarization efficiency in the visible light region and maintains its polarization characteristics without physical deformation even at temperatures greater than 100 °C. Moreover, the transmission according to the angle formed by two CNT sheets follows the Malus law, similar to a typical polarizer. Finally, the applicability of the CNT sheet polarizer on a commercial liquid crystal displays monitor is demonstrated.

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supporting

confidence: 92%

Flexible and Thermally Stable Optical Polarizers Based on Highly Aligned Carbon Nanotube Sheets for the Visible Spectral Range

Jung

Noh

Suh

et al. 2018

Adv Materials Technologies

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“…Using highly absorbent materials [18], including highly lossy materials [27], integrating different resonant units either in the horizontal or vertical direction [28], utilizing lumped circuits [29], use of magnetic substrates [14], anti-reflection coating [30], based on water [31], resistive films [32], use of transparent spacers such as indium tin oxide (ITO) [33][34][35][36][37], FSSs [38][39][40], polymeric nanocomposites [41][42][43][44][45][46], etc. are some of the techniques to overcome this challenge.…”

Section: Bandwidth-thicknessmentioning

confidence: 99%

“…They have strong mechanical properties, with a tensile strength of 50-500 GPa and an elastic modulus value of 1 TPa. CNTs can be prepared to realize strong semiconducting properties and high charge mobility and current-carrying ability [44]. CNTs are non-magnetic, thus, the absorption process originates from polarization, ohmic losses, or multiple scattering.…”

Section: Single-layered Absorbersmentioning

confidence: 99%

Broadband millimeter-wave absorbers: a review

Choudhary

Pal

Sarkhel

2022

Int. J. Microw. Wireless Technol.

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This paper reports an exhaustive review of recent research progress in the development of millimeter-wave absorbers. With the advancement in technologies, microwave absorbers have shown their evolution in several applications such as defense, security identification, stealth technology, and several more. The importance of these absorbers is increasing due to electromagnetic interference (EMI) effects. Primarily, an abundant amount of absorbers has been developed in lower frequency bands and with the increasing demand for 5G technology, the usage of millimeter-wave bands has gained attention. This in turn requires the development of millimeter-wave absorbers to provide EMI shielding in several applications. Out of several materials, polymers have grabbed attention in the mitigation of EMI. An absorber that combines carbonaceous elements with polymers offers large design flexibility and tunability per the filler concentration. This paper focuses on the classification of these absorbers based on geometry as well as that by using polymers with their design challenges, merits, and demerits with their industrial applications. Comparative studies of geometrically based absorbers and polymeric-based absorbers are also shown.

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“…The tunability of the optical, electrical and mechanical properties of Carbon Nanotubes (CNTs) has made it a widely researched material. Several interesting optical properties have been observed in vertically aligned (VA) CNT arrays, such as photonic crystal [1,2], directional emission [3,4], wavelength-selective emission and polarization-dependent reflection [5,6], and high absorptivity [7,8], which can potentially be utilized in many optical applications. VACNTs exhibit high absorbance of light over a spectrum ranging from the visible to infrared (IR) wavelength region, due to inter-band transitions and free-electron absorption, while providing a high impedance matching to air [9].…”

Section: Introductionmentioning

confidence: 99%

Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time

Gheitaghy

Ghaderi

Vollebregt

et al. 2020

Materials Research Bulletin

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In this paper, the growth of optimized vertically aligned multi-walled carbon nanotube (VA-MWCNT) forests by LPCVD method for use in a large-area absorber in infrared detectors is presented. The effect of synthesis temperature (500−700°C) and time (1−10 min) on the optical absorption coefficient in the infrared (2−20 μm) is investigated by FT-IR measurement at various incident angles (15-80°). The structural properties of VA-MWCNT are characterized by SEM, TEM and Raman spectroscopy. Spectral measurements show an increasing absorption with the height of the forest that results at increased synthesis time and temperature. However, the absorption coefficient decreases with increasing synthesize time and temperature, while it is also affected by other properties, such as diameter, density, alignment, and uniformity. Moreover, the reduction in absorption at oblique incident angles demonstrates the relevance of surface properties. Finally, a circular graphite waveguide system is used to model the absorption characteristics of an MWCNT forest.

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Flexible polarization‐dependent absorbers based on patterned carbon nanotubes films

Cited by 7 publications

References 20 publications

Flexible and Thermally Stable Optical Polarizers Based on Highly Aligned Carbon Nanotube Sheets for the Visible Spectral Range

Flexible and Thermally Stable Optical Polarizers Based on Highly Aligned Carbon Nanotube Sheets for the Visible Spectral Range

Broadband millimeter-wave absorbers: a review

Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time

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