Thermal camouflage based on the phase-changing material GST

Qu, Yue; Li, Qiang; Cai, Lu; Pan, Meiyan; Ghosh, Pintu; Du, Kaikai; Qiu, Min

doi:10.1038/s41377-018-0038-5

Cited by 326 publications

(191 citation statements)

References 66 publications

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Section: Phase Change Materialsmentioning

confidence: 99%

“…Exploiting the material property of GST at wavelength below 660 nm, i.e., where Re(ε cr‐GST ) < 0 and Re(ε am‐GST ) > 0, Gholipour et al demonstrated a GST nanograting metasurface that exhibits switchable reflection/transmission behavior accompanied with remarkable color changes (Figure c), showing the potential of the proposed metasurface for active solid‐state displays . The nonvolatile phase transition properties of GST films can be applied to realize controllable mid‐infrared thermal emission . It should be noted that contrary to the emissivity tuning of the GST‐hybrid, the modulation addressed in these studies arises from the intrinsic emission change of the GST structures.…”

Section: Phase Change Materialsmentioning

confidence: 99%

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Recent Progress in Active Optical Metasurfaces

Kang

Jenkins

Werner

2019

Advanced Optical Materials

152

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Evolving from metamaterials, optical metasurfaces not only inherit their unprecedented flexibility in tailoring light–matter interaction but also the generally fixed response determined by the metaatoms' geometries—an undesirable property that hinders the development of practical metadevices. Consequently, novel optical metasurfaces that can be tuned in an active manner are intensively studied in recent years. Due to their optically thin structures, optical metasurfaces present unique characteristics in the realization of dynamic tuning. In this review, a detailed summary of the recent advances in active optical metasurfaces is provided including discussions reviewing a variety of active materials and approaches that enable faster, stronger, and more accurate tuning. Beyond facilitating practical metadevices, studies of active metasurfaces have, and will continue to deepen the understandings of the interaction between light and nanostructured photonic architectures and to promote the development of nanofabrication techniques involving high‐complexity.

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Section: Phase Change Materialsmentioning

confidence: 99%

Section: Phase Change Materialsmentioning

confidence: 99%

Recent Progress in Active Optical Metasurfaces

Kang

Jenkins

Werner

2019

Advanced Optical Materials

152

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“…Phase-change memory (PCM) materials work by switching between their amorphous and crystalline phases under an appropriate electrical or laser pulse [1][2][3][4][5] . At the same time, the great contrasts in resistance and refractive index/reflectivity between the two phases ensure the applications of PCM materials in both non-volatile electrical and optical memory [6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Time-dependent density-functional theory molecular-dynamics study on amorphization of Sc-Sb-Te alloy under optical excitation

Wang

Chen

et al. 2020

npj Comput Mater

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Recently, all-optical memory and optical-computation properties of phase-change materials are receiving intensive attention. Because writing/erasing information in these devices is usually achieved by laser pulses, the interaction between the laser and the phase-change materials becomes a key issue for such new applications. In this work, by a time-dependent density-functional theory molecular-dynamics study, the physics underlying the optical excitation induced amorphization of Sc-Sb-Te is revealed, which goes back to superatom-like Sc-centered structural motifs. These motifs are found to be still robust under the excitation. A selected occupation of the Sc d-t 2g orbitals (as a result of optical excitation) leads to a significant change of Sc-centered bond angles. In addition, the especially weak Sb-Te bonds next to the Sc motifs are further diminished by excitations. Therefore, the Sc-centered motifs can promote breaking, switching, and reforming of the surrounding Sb-Te network and, therefore, facilitate the amorphization of Sc-Sb-Te. The study shows the unique role of Sc-centered motifs in optically induced phase transition, and displays potential applications of Sc-Sb-Te alloys in optical memory/computation. npj Computational Materials (2020) 6:31 ; https://doi.

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“…So far, strategies for breaking the 50% absorption limit in the visible and infrared region are mainly based on metal‐dielectric schemes. These strategies include metal–insulator–metal plasmonic absorbers, dielectric‐on‐metal absorbers, film stacks‐based Fabry‐Perot cavity absorbers, etc. However, for these designs with the aid of metals, a significant portion of absorption takes place in metals, where heat instead of photocarriers is generated.…”

Section: Introductionmentioning

confidence: 99%

Near‐Infrared Super‐Absorbing All‐Dielectric Metasurface Based on Single‐Layer Germanium Nanostructures

Tian

Luo

et al. 2018

Laser & Photonics Reviews

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Strong near‐infrared absorption in ultrathin semiconductor layers is essential for increasing the speed and efficiency of photocarrier extraction in optoelectronic devices. However, the absorption of a free‐standing ultrathin film can never exceed 50% in principle. In this article, an all‐dielectric germanium metasurface absorber in the near‐infrared region (800–1600 nm) is proposed theoretically and experimentally. Near‐unity absorption can be achieved in such a subwavelength‐thin (≈0.13 λ0) layer of nanostructures based on the destructive interference between simultaneously excited electric and magnetic dipoles inside each element in the backward direction in combination with the destructive interference between the scattered field and the incident field in the forward direction. Its response is both polarization‐independent and angle‐insensitive, with over 80% absorption at an incident angle up to 28°. This ultrathin and flexible design paves the way for realizing next generation optoelectronic devices aimed for high‐speed photon detection and energy harvesting.

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Thermal camouflage based on the phase-changing material GST

Cited by 326 publications

References 66 publications

Recent Progress in Active Optical Metasurfaces

Recent Progress in Active Optical Metasurfaces

Time-dependent density-functional theory molecular-dynamics study on amorphization of Sc-Sb-Te alloy under optical excitation

Near‐Infrared Super‐Absorbing All‐Dielectric Metasurface Based on Single‐Layer Germanium Nanostructures

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