Nguyen Hai-Thai, Yen Zhi-Long, Su Yen-Hsun, Hsieh Ya-Ping, Hofmann Mario
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan.
Department of Physics, National Taiwan University, Taipei, 10617, Taiwan.
Small. 2022 Sep;18(37):e2202199. doi: 10.1002/smll.202202199. Epub 2022 Jul 22.
Optical rectennas extend the electromagnetic wave rectification process into the visible regime and provide a route toward high-performance photodetection and energy harvesting. Here, the promise of 2D materials toward on-chip optical rectennas is demonstrated. A self-aligned patterning process yields lateral MIM structures where a nanometer-sized air gap separates a 2D material contact from a metal electrode. This device can be scalably produced in large arrays using established microfabrication techniques. Different from previous approaches, the performance of the 2D rectenna can be adjusted through electrostatic gating. Optimization of the band alignment leads to strong rectification at wavelengths around 500 nm and clear polarization control. Comparison of wavelength-dependent rectenna performance with a photon-assisted tunneling model reveals a tenfold increase in photon-electron coupling over nanotube-based rectennas. The results highlight the potential of 2D material-based rectennas for future quantum computing applications.
光学整流天线将电磁波整流过程扩展到可见光范围，并为高性能光电探测和能量收集提供了一条途径。在此，展示了二维材料用于片上光学整流天线的前景。一种自对准图案化工艺产生横向金属-绝缘体-金属（MIM）结构，其中纳米级气隙将二维材料接触层与金属电极隔开。该器件可以使用成熟的微加工技术以可扩展的方式大规模生产。与以前的方法不同，二维整流天线的性能可以通过静电门控进行调节。能带对准的优化导致在波长约500纳米处有强整流作用，并实现清晰的偏振控制。将波长相关的整流天线性能与光子辅助隧穿模型进行比较，结果表明与基于纳米管的整流天线相比，光子-电子耦合增加了十倍。这些结果突出了基于二维材料的整流天线在未来量子计算应用中的潜力。
