Large-area, freestanding single-crystal gold of single nanometer thickness
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.
Keywords
Cite
@article{arxiv.2311.07858,
title = {Large-area, freestanding single-crystal gold of single nanometer thickness},
author = {Chenxinyu Pan and Yuanbiao Tong and Haoliang Qian and Alexey V. Krasavin and Jialin Li and Jiajie Zhu and Yiyun Zhang and Bowen Cui and Zhiyong Li and Chenming Wu and Zhenxin Wang and Lufang Liu and Linjun Li and Xin Guo and Anatoly V. Zayats and Limin Tong and Pan Wang},
journal= {arXiv preprint arXiv:2311.07858},
year = {2024}
}