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High-Efficiency Spatial-Wave Frequency Multiplication Using Strongly Nonlinear Metasurface
Advanced Science ( IF 14.3 ) Pub Date : 2021-07-15 , DOI: 10.1002/advs.202101212 Hai Peng Wang 1, 2 , Yun Bo Li 1 , Shi Yu Wang 1 , Jia Lin Shen 1 , He Li 1 , Shi Jin 2 , Tie Jun Cui 1
Advanced Science ( IF 14.3 ) Pub Date : 2021-07-15 , DOI: 10.1002/advs.202101212 Hai Peng Wang 1, 2 , Yun Bo Li 1 , Shi Yu Wang 1 , Jia Lin Shen 1 , He Li 1 , Shi Jin 2 , Tie Jun Cui 1
Affiliation
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In the past decades, metasurfaces have opened up a promising venue for manipulating lights and electromagnetic (EM) waves. In the field of nonlinearity, second-harmonic generation (SHG) is a research focus due to its diverse applications. There have been many researches for realizing SHG in optical regime using nonlinear characteristics of optical materials, but its efficiency is low. In microwave frequencies, SHGs are basically studied in the guided-wave systems. Here, high-efficiency SHGs of spatial waves are presented in the microwave frequency using nonlinear metasurface loaded with active chips at the subwavelength scale. The nonlinear meta-atom is composed of receiving antenna, transmitting antenna, and active circuit of frequency multiplier, which can realize strongly nonlinear response and link the EM signals from the receiving to transmitting antennas. Correspondingly, to achieve the function of spatial-wave frequency multiplication, the working frequency of the transmitting antenna in the meta-atom should be twice as that of the receiving antenna, and hence the active chip is well matched to obtain the signal transforming with high efficiency. Good performance of the spatial-wave frequency multiplication is demonstrated in the proof-of-concept experiments with the best transform efficiency of 85.11% under normal incidence, validating the proposed method.
中文翻译：
使用强非线性超表面的高效空间波倍频
在过去的几十年里，超表面为操纵光和电磁波开辟了一个有前途的场所。在非线性领域，二次谐波产生（SHG）因其广泛的应用而成为研究热点。利用光学材料的非线性特性在光学范围内实现倍频的研究已有很多，但其效率较低。在微波频率中，二次谐波基本上是在导波系统中研究的。在这里，使用加载有亚波长尺度有源芯片的非线性超表面在微波频率中呈现高效的空间波二次谐波。非线性超原子由接收天线、发射天线和倍频有源电路组成，可以实现强非线性响应，将接收天线的电磁信号链接到发射天线。相应地，要实现空间波倍频的功能，元原子中发射天线的工作频率应为接收天线的工作频率的两倍，因此有源芯片良好匹配，可以获得高频率的信号变换。效率。概念验证实验证明了空间波倍频的良好性能，法向入射下的最佳变换效率为 85.11%，验证了所提出的方法。
更新日期：2021-09-22
中文翻译：
使用强非线性超表面的高效空间波倍频
在过去的几十年里，超表面为操纵光和电磁波开辟了一个有前途的场所。在非线性领域，二次谐波产生（SHG）因其广泛的应用而成为研究热点。利用光学材料的非线性特性在光学范围内实现倍频的研究已有很多，但其效率较低。在微波频率中，二次谐波基本上是在导波系统中研究的。在这里，使用加载有亚波长尺度有源芯片的非线性超表面在微波频率中呈现高效的空间波二次谐波。非线性超原子由接收天线、发射天线和倍频有源电路组成，可以实现强非线性响应，将接收天线的电磁信号链接到发射天线。相应地，要实现空间波倍频的功能，元原子中发射天线的工作频率应为接收天线的工作频率的两倍，因此有源芯片良好匹配，可以获得高频率的信号变换。效率。概念验证实验证明了空间波倍频的良好性能，法向入射下的最佳变换效率为 85.11%，验证了所提出的方法。
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