论文标题
基于相变材料的非线性中红外跨表面
Nonlinear Mid-infrared Metasurface based on a Phase-Change Material
论文作者
论文摘要
中波红外（MWIR）光谱区域（3-5μM）对于在成像，传感，光谱，手术和光学通信方面的多种应用很重要。有效的第三次谐波生成（THG），将光线从MWIR范围转换为近红外（具有成熟的光学检测和操纵技术的区域），提供了减轻对当前MWIR系统的公认限制的机会。在这项工作中，我们提出了通过元图设计在MWIR中提高THG的可能性。具体而言，我们通过在支持磁性偶极谐振的亚波长圆柱体的阵列中，在高度非线性相变材料GE2SB2SE4TE1（GSST）中展示了30倍的增强。前所未有的宽带透明度，较大的折射率和非常高的非线性响应，以及独特的相变特性，使基于GSST的基于GSST的元信息成为了在MWIR中运行的可重新配置和可重新配置和超紧凑型非线性设备的吸引力的解决方案。
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.
