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arXiv 2008.13332physics.optics
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基于相变材料的非线性中红外超表面

Nonlinear Mid-infrared Metasurface based on a Phase-Change Material

Fuyong Yue, Riccardo Piccoli, Mikhail Y. Shalaginov, Tian Gu, Kathleen Richardson, Roberto Morandotti, Juejun Hu, Luca Razzari

摘要:

中波红外(MWIR)光谱区域(3-5 μm)对于成像、传感、光谱学、外科手术和光通信中的各种应用都很重要。高效的三次谐波产生(THG),将光从MWIR范围转换为近红外,这是一个具有成熟光学检测和操纵技术的区域,为减轻当前MWIR系统的普遍公认的限制提供了机会。在这项工作中,我们提出的可能性,提高THG中的MWIR通过超表面设计。具体而言,我们证明了30倍的增强,在高度非线性相变材料Ge 2Sb 2Se 4 Te 1(GSST),通过图案化阵列的亚波长圆柱体支持磁偶极共振。前所未有的宽带透明度,大折射率,和显着高的非线性响应,加上独特的相变特性,使基于GSST的超颖表面的可重构和超紧凑的非线性器件在MWIR中工作的一个有吸引力的解决方案。

英文摘要:

The mid-wave infrared (MWIR) spectral region (3-5 μm) is important to a vast variety of applications in imaging, sensing, spectroscopy, surgery, and optical communications. Efficient third-harmonic generation (THG), converting light from the MWIR range into the near-infrared, a region with mature optical detection and manipulation technologies, offers the opportunity to mitigate a commonly recognized limitation of current MWIR systems. In this work, we present the possibility of boosting THG in the MWIR through a metasurface design. Specifically, we demonstrate a 30-fold enhancement in a highly nonlinear phase change material Ge2Sb2Se4Te1 (GSST), by patterning arrays of subwavelength cylinders supporting a magnetic dipolar resonance. The unprecedented broadband transparency, large refractive index, and remarkably high nonlinear response, together with unique phase-change properties, make GSST-based metasurfaces an appealing solution for reconfigurable and ultra-compact nonlinear devices operating in the MWIR.

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