1. Large-area, freestanding single-crystal gold of single nanometer thickness
- Author
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Pan, Chenxinyu, Tong, Yuanbiao, Qian, Haoliang, Krasavin, Alexey V., Li, Jialin, Zhu, Jiajie, Zhang, Yiyun, Cui, Bowen, Li, Zhiyong, Wu, Chenming, Wang, Zhenxin, Liu, Lufang, Li, Linjun, Guo, Xin, Zayats, Anatoly V., Tong, Limin, and Wang, Pan
- Subjects
Physics - Optics - Abstract
Two-dimensional single-crystal metals are highly sought after for next-generation technologies. Here, we report large-area (>10^4 {\mu}m2), single-crystal two-dimensional gold with thicknesses down to a single-nanometer level, employing an atomic-level-precision chemical etching approach. The ultrathin thickness and single-crystal quality endow two-dimensional gold with unique properties including significantly quantum-confinement-augmented optical nonlinearity, low sheet resistance, high transparency and excellent mechanical flexibility. By patterning the two-dimensional gold into nanoribbon arrays, extremely-confined near-infrared plasmonic resonances are further demonstrated with quality factors up to 5. The freestanding nature of two-dimensional gold allows its straightforward manipulation and transfer-printing for integration with other structures. The developed two-dimensional gold provides an emerging platform for fundamental studies in various disciplines and opens up new opportunities for applications in high-performance ultrathin optoelectronic, photonic and quantum devices.
- Published
- 2023
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