Nonlinear Plasmonic Metasurface Terahertz Emitters for Compact Terahertz Spectroscopy Systems,ACS Photonics

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Nonlinear Plasmonic Metasurface Terahertz Emitters for Compact Terahertz Spectroscopy Systems
ACS Photonics ( IF 6.5 ) Pub Date : 2020-11-24 , DOI: 10.1021/acsphotonics.0c01012
Mai Tal _{1,

2,

3} , Shay Keren-Zur _{1,

3} , Tal Ellenbogen _{1,

3}

Affiliation

Nonlinear plasmonic metasurfaces provide new and promising means to produce broadband terahertz (THz) radiation, due to their compact size and functionalities beyond those achievable with conventional THz emitters. However, they were driven to date only by amplified laser systems, which are expensive and have a large footprint, thus limiting the range of their potential applications. Here we study for the first time the possibility to drive metasurface emitters by low-energy near-infrared femtosecond pulses. We observe broadband THz emission from 40 nm thick metasurfaces and achieve near-infrared to THz conversion efficiencies as high as those of 2500-fold thicker ZnTe crystals. We characterize the THz emission properties and use the metasurface emitter to perform a spectroscopic measurement of α-lactose monohydrate. These results show that nonlinear plasmonic metasurfaces are suitable for integration as emitters in existing compact THz spectroscopy and imaging systems, enhancing their functionalities, and opening the door for a variety of new applications.

中文翻译：

紧凑型太赫兹光谱系统的非线性等离子超表面太赫兹发射器

非线性等离子超颖表面为产生宽带太赫兹（THz）辐射提供了新的有前途的手段，这是因为它们的紧凑尺寸和功能超出了常规THz发射器所能达到的那些。然而，迄今为止，它们仅由放大的激光系统驱动，该系统昂贵且占地面积大，因此限制了其潜在应用范围。在这里，我们首次研究了通过低能近红外飞秒脉冲驱动超表面发射器的可能性。我们观察到从40 nm厚的超表面发射的宽带THz辐射，并达到了2500倍厚ZnTe晶体的近红外至THz转换效率。我们表征了太赫兹发射特性，并使用超表面发射体对α-乳糖一水合物进行了光谱测量。

更新日期：2020-12-16

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