Radial gradient refractive index from crystallized chalcogenide glass for infrared applications

Hingant, T.; Lavanant, Enora; Proux, Raphaël; Rozé, Mathieu; Cheviré, François; Guimond, Yann; Franks, John; Calvez, Laurent; Zhang, Xianghua

doi:10.1117/12.2558009

Cited by 2 publications

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“…We pressed a GRIN sample into a spherical lens and built a thermal-imaging set-up to observe the imaging of the GRIN lens [ 2 ] ( Figure 8 a). The set-up consisted mainly of a hot plate that illuminated a grid (glowing in the longwave infrared region).…”

Section: Resultsmentioning

confidence: 99%

“…The self-focusing GRIN lens, which can refract the light transmitted in the axial direction and gradually reduce the distribution of the refractive index along the radial direction, has been proposed for IR optics to reduce the weight and provide an additional degree of optical freedom for the design. An optical device known as a GRIN lens has refractive indices that continuously vary in the axial [ 1 ], radial [ 2 ], and spherical [ 3 ] dimensions. The refractive index of a GRIN lens is not a fixed constant [ 4 ], which is the main difference from conventional optics.…”

Section: Introductionmentioning

confidence: 99%

“…The GRIN lens has been observed in the eyes of humans and fish for optics in the visible spectrum. Element diffusion [ 8 ], ion exchange [ 9 ], electrospray printing [ 10 ], laser-induced vitrification [ 11 ], and controlled nanocrystal formation [ 2 ] have been used to fabricate small GRIN lenses for the infrared region. Infrared GRIN lenses have made significant progress in recent years.…”

Section: Introductionmentioning

confidence: 99%

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High Refractive Index GRIN Lens for IR Optics

et al. 2023

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Infrared gradient refractive index (GRIN) material lenses have attracted much attention due to their continuously varying refractive index as a function of spatial coordinates in the medium. Herein, a glass accumulation thermal diffusion method was used to fabricate a high refractive index GRIN lens. Six Ge17.2As17.2SexTe(65−x) (x = 10.5–16) glasses with good thermal stability and high refractive index (n@10 μm > 3.1) were selected for thermal diffusion. The refractive index span (∆n) of 0.12 was achieved in this GRIN lens. After thermal diffusion, the lens still had good transmittance (45%) in the range of 8–12 μm. Thermal imaging confirmed that this lens can be molded into the designed shape. The refractive index profile was indirectly characterized by the structure and composition changes. The structure and composition variation became linear with the increase in temperature from 260 °C to 270 °C for 12 h, indicating that the refractive index changed linearly along the axis. The GRIN lens with a high refractive index could find applications in infrared optical systems and infrared lenses for thermal imaging.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Refractive Index GRIN Lens for IR Optics

et al. 2023

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“…[157,159] The stimuli often cause gradient vitrification [157,158,124] (Figure 5e) or gradient cross-linking density [99,276,277] (Figure 8e). This method can be used to prepare both compositional (e.g., cross-linking) and micro-structural (e.g., devitrification) FGMs in either radial [278] or linear [158,124] direction. However, it may not support complex gradient designs that can otherwise be produced via AM.…”

Section: Overview Of Fabrication Techniques For Manmade Fgmsmentioning

confidence: 99%

Soft Functionally Gradient Materials and Structures – Natural and Manmade: A Review

Pragya

Ghosh

2023

Advanced Materials

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Functionally gradient materials (FGM) have gradual variations in their properties along one or more dimensions due to local compositional or structural distinctions by design. Traditionally, hard materials (e.g., metals, ceramics) have been used to design and fabricate FGMs; however, there has been increasing interest in polymer‐based soft and compliant FGMs mainly because of their potential application in the human environment. Soft FGMs are not only ideally suitable to manage interfacial problems in dissimilar materials used in many emerging devices and systems for human interaction, such as soft robotics and electronic textiles and beyond. Soft systems are ubiquitous in our everyday lives; they are resilient and can easily deform, absorb energy and adapt to changing environments. Here, we discuss the basic design and functional principles of biological FGMs and their manmade counterparts using representative examples. The remarkable multifunctional properties of natural FGMs resulting from their sophisticated hierarchical structures, built from a relatively limited choice of materials, offer a rich source of new design paradigms and manufacturing strategies for manmade materials and systems for emerging technological needs. Finally, we highlight the challenges and potential pathways to leverage soft materials' facile processability and unique properties to wards functional FGMs.This article is protected by copyright. All rights reserved

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Radial gradient refractive index from crystallized chalcogenide glass for infrared applications

Cited by 2 publications

References 0 publications

High Refractive Index GRIN Lens for IR Optics

High Refractive Index GRIN Lens for IR Optics

Soft Functionally Gradient Materials and Structures – Natural and Manmade: A Review

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