Selection of absorptive materials for non-reflective wire grid polarizers

Kim, Ji Hoon; Cho, Young Tae; Jung, Yeon Gil

doi:10.1007/s12541-016-0110-0

Cited by 13 publications

(6 citation statements)

References 12 publications

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“…Therefore, electromagnetic radiation occurs in waves traveling both in front of and behind the TE wave because of the generated current. Radiation caused by the rear wave appears as the reflected wavelength; the front wave is removed by the incident wavelength, 17 , 18 as displayed in Fig. 1.…”

Section: Design and Simulationmentioning

confidence: 99%

Design of an Au–Pt–Ti wire-grid polarizer based on midinfrared pixelated micropolarizer arrays

Shaohu

Zhao

et al. 2023

Opt. Eng.

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Polarization information is widely used in complex applications such as industrial detection, biomedicine, earth remote sensing, modern military, and aerospace. However, traditional polarization devices cannot adequately satisfy the requirements of increasingly complex environments. A subwavelength grating consisting of three types of materials, namely, aurum, platinum, and titanium, was designed to improve the performance of the polarimetric components of a midwavelength infrared polarization imaging system. The morphological structure parameters of the designed grating were optimized by analyzing the effects on the polarization performance through the rigorous coupled wave theory. The proposed Au-Pt-Ti composite grating could address the problem of grating peeling off from the substrate because of high temperature during preparation. The composite grating has some advantages such as high mechanical stability, lower oxidation, and great polarization properties. The diffraction can be reduced and the extinction ratio (ER) can be effectively enhanced in a midwave infrared (MWIR) focal plane array through appropriate reduction in the termination edge spacing and the addition of a gold frame between polarizer pixels. The grating with a period of 0.8 μm was designed for application in the MWIR band. The fill factor was 0.5 and the depths of Au-Pt-Ti in the grating region were 0.44 μm. Each pixel was separated by a 3.2-μm wide gold frame. Modeling results revealed that the ER of grating was higher than 28.68 and 32.77 above the incident wavelengths of 3.89 and 4.57 μm, respectively. Additionally, excellent polarization capability was observed over a wide MWIR spectrum. Furthermore, the current manufacturing process level may generate polarizers with the aforementioned structural specifications.

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Section: Design and Simulationmentioning

confidence: 99%

Design of an Au–Pt–Ti wire-grid polarizer based on midinfrared pixelated micropolarizer arrays

Shaohu

Zhao

et al. 2023

Opt. Eng.

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“…In this study, we propose an approach to reduce the reflectivity of WGPs to realise a highly durable polariser sheet with low reflectivity. Although various approaches have been researched and developed to reduce the reflectivity of WGPs, many of these methods involve laminating a light-absorbing material onto a wire-grid structure 15 – 17 , or using low-reflectivity metal on a wire-grid structure 18 , 19 . A moth-eye structure has been demonstrated as a method of suppressing the reflectance of a material surface 20 – 22 .…”

Section: Introductionmentioning

confidence: 99%

Low-reflective wire-grid polariser sheet in the visible region fabricated by a nanoprinting process

Hokari

Takakuwa²,

Kato

et al. 2021

Sci Rep

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For the construction of next-generation optical products and systems, the evolution of polariser sheets is a necessary requirement. To this end, a low-reflective wire-grid polariser (WGP) sheet for the visible light region is demonstrated, the nanowires of which consist of a sintered body of silver nanoparticle ink. The nanowires are formed by a nanoprinting process using a thermal nanoimprint method and ink filling. This process makes it easier to achieve multiple wafer-scale productions without using sophisticated equipment compared to conventional WGP nanofabrication techniques, which typically employ lithography and elaborate etching processes. The optical characteristics are controlled by the shape of the printed nanowires. A WGP sheet with a luminous degree of polarisation of 99.0%, a total luminous transmittance of 13.6%, and a luminous reflectance of 3.6% is produced. Its low reflectance is achieved through the uneven surface derived from the sintered body of the nanoparticle ink, and the shape of the bottom of the nanowire is derived from the tip shape of the mould structure. Furthermore, the printed WGP sheet has the durability required for the manufacturing of curved products, including sunglasses. The optical structures made of nanoparticle ink using this nanoprinting process have the potential to significantly contribute to the development of fine-structured optical elements with unprecedented functionality.

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“…In particular, nanofibers are widely used in stretchable and transparent electrodes 9 , wearable sensors 10,11 , interconnections 12,13 , and nanooptics applications 14 . Among the various methods of fabricating nanoscale structures, such as sol-gel methods, self-assembly, lithography, and replication 15,16,17,18,19,20 , direct replication using a template is currently considered a promising method because it is simple, cost-effective, and applicable to various curable materials 21,22,23,24,25,26 .…”

Section: Introductionmentioning

confidence: 99%

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Jeong¹,

Kim²,

Fang³

et al. 2018

JoVE

Self Cite

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Multiscale surface structures have attracted increasing interest owing to several potential applications in surface devices. However, an existing challenge in the field is the fabrication of hybrid micro-nano structures using a facile, cost-effective, and high-throughput method. To overcome these challenges, this paper proposes a protocol to fabricate multiscale structures using only an imprint process with an anodic aluminum oxide (AAO) filter and an evaporative self-aggregation process of nanofibers. Unlike previous attempts that have aimed to straighten nanofibers, we demonstrate a unique fabrication method for multiscale aggregated nanofibers with high aspect ratios. Furthermore, the surface morphology and wettability of these structures on various liquids were investigated to facilitate their use in multifunctional surfaces.

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Selection of absorptive materials for non-reflective wire grid polarizers

Cited by 13 publications

References 12 publications

Design of an Au–Pt–Ti wire-grid polarizer based on midinfrared pixelated micropolarizer arrays

Design of an Au–Pt–Ti wire-grid polarizer based on midinfrared pixelated micropolarizer arrays

Low-reflective wire-grid polariser sheet in the visible region fabricated by a nanoprinting process

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

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