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Phase change materials (PCM) for the reconfiguration of terahertz devices

Abstract : Multifunctional devices are crucial for the development of new connected devices integrating new applications in all aspects of daily life(augmented reality, virtual reality, self-driving cars, smart cities, etc). However, their expansion is still requiring efficient agility functions operating in the terahertz domain. Chalcogenide phase change materials with broadband responses, non-volatile and reversible transitions between insulating (amorphous)and conducting (crystalline) phases were successfully investigated as agile elements in photonics or electronics applications. In this manuscript, we proposed to use germanium telluride (GeTe) PCM as an agile element for the realization of optically reconfigurable terahertz devices. For that, we demonstrated optical control of specific states of the GeTe and characterized its terahertz properties. The excellent contrast of the material’s terahertz properties in the two dissimilar states was used to realize hybrid metamaterial based on split-ring-resonator metallic structures integrating GeTe patterns which can achieve optical-induced modulation of incident terahertz waves. We also demonstrated the feasibility of all dielectric GeTe-based terahertz devices presenting broadband response and high modulations of the terahertz response. Thus, this highly functional approach based on non-volatile optically controlled multi-operational terahertz devices integrating PCMs opensa new path for devices developments in the terahertz domain like field-programmable metasurfaces, all-dielectric coding metamaterials with multifunctional capabilities for terahertz field manipulation.
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https://tel.archives-ouvertes.fr/tel-03577668
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Submitted on : Wednesday, February 16, 2022 - 5:51:19 PM
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  • HAL Id : tel-03577668, version 1

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Maxime Pinaud. Phase change materials (PCM) for the reconfiguration of terahertz devices. Electronics. Université de Limoges, 2021. English. ⟨NNT : 2021LIMO0078⟩. ⟨tel-03577668⟩

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