Integrated terahertz generator-manipulator using epsilon-near-zero-hybrid nonlinear metasurfaces

Abstract
In terahertz (THz) technologies, generation and manipulation of THz waves are two key processes usually implemented by different device modules. Integrating THz generation and manipulation into a single compact device will advance the applications of THz technologies in various fields. Here, we demonstrate a hybrid nonlinear plasmonic metasurface incorporating an epsilon-near-zero (ENZ) indium tin oxide (ITO) layer, for seamlessly combining efficient generation and manipulation of THz waves across a wide frequency band. The coupling between the plasmonic resonance of the metasurface and the ENZ mode of the ITO thin film enhances the THz conversion efficiency by more than four orders of magnitude. Meanwhile, such a hybrid device is capable of shaping the polarization and wavefront of the emitted THz beam via the engineered nonlinear Pancharatnam-Berry (PB) phases of the plasmonic meta-atoms. The presented hybrid nonlinear metasurface opens a new avenue towards miniaturized integrated THz devices and systems with advanced functionalities.

Citation
Lu, Y., Feng, X., Wang, Q., Zhang, X., Fang, M., Sha, W. E. I., … Zhang, W. (2021). Integrated Terahertz Generator-Manipulators Using Epsilon-near-Zero-Hybrid Nonlinear Metasurfaces. Nano Letters. doi:10.1021/acs.nanolett.1c02372

Acknowledgements
This work is supported by the National Key Research and Development Program of China (Grant No. 2017YFA0701004); the National Natural Science Foundation of China (Grant Nos. 61735012, 62025504, 62075158, 11974259, 61875150, 61935015, 62005193, 61901001, U20A20164, 61971001, 61975177 and 62135008); the Tianjin Municipal Fund for Distinguished Young Scholars (18JCJQJC45600); the UK's Engineering and Physical Sciences Research Council (Grant Nos. EP/M009122/1 and EP/T02643X/1); H2020 ERC Consolidator Grant (648783). The authors acknowledge the High-performance Computing Platform of Anhui University for providing computing resources.

Publisher
American Chemical Society (ACS)

Journal
Nano Letters

DOI
10.1021/acs.nanolett.1c02372

Relations
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  • [Dataset]
    Lu, Y., Feng, X., Wang, Q., Zhang, X., Fang, M., Sha, W. E. I., Huang, Z., Xu, Q., Niu, L., Chen, X., Ouyang, C., Yang, Y., Zhang, X., Plum, E., Zhang, S., Han, J., & Zhang, W. (2021). Dataset for Integrated terahertz generator-manipulators using epsilon-near-zero-hybrid nonlinear metasurfaces [Data set]. University of Southampton. https://doi.org/10.5258/SOTON/D1948. DOI: 10.5258/soton/d1948 Handle: 10754/686883

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