Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510006, P. R. China.
Centre for Micro-Photonics and Ultrahigh Bandwidth Devices for Optical Systems, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia.
Adv Mater. 2017 Sep;29(35). doi: 10.1002/adma.201701918. Epub 2017 Jul 17.
Data storage with ultrahigh density, ultralow energy, high security, and long lifetime is highly desirable in the 21st century and optical data storage is considered as the most promising way to meet the challenge of storing big data. Plasmonic coupling in regularly arranged metallic nanoparticles has demonstrated its superior properties in various applications due to the generation of hot spots. Here, the discovery of the polarization and spectrum sensitivity of random hot spots generated in a volume gold nanorod assembly is reported. It is demonstrated that the two-photon-induced absorption and two-photon-induced luminescence of the gold nanorods adjacent to such hot spots are enhanced significantly because of plasmonic coupling. The polarization, wavelength, and spatial multiplexing of the hot spots can be realized by using an ultralow energy of only a few picojoule per pulse, which is two orders of magnitude lower than the value in the state-of-the-art technology that utilizes isolated gold nanorods. The ultralow recording energy reduces the cross-talk between different recording channels and makes it possible to realize rewriting function, improving significantly both the quality and capacity of optical data storage. It is anticipated that the demonstrated technology can facilitate the development of multidimensional optical data storage for a greener future.
在 21 世纪，人们非常希望能够实现超高密度、超低能量、高安全性和长寿命的数据存储，而光数据存储被认为是满足大数据存储挑战的最有前途的方法。由于热点的产生，在规则排列的金属纳米粒子中的等离子体耦合已经在各种应用中展示了其优越的性能。在这里，报道了在体积金纳米棒组装体中产生的随机热点的偏振和光谱灵敏度的发现。结果表明，由于等离子体耦合，相邻热点的金纳米棒的双光子吸收和双光子发光显著增强。热点的偏振、波长和空间复用可以通过仅使用每脉冲几个皮焦耳的超低能量来实现，这比利用孤立金纳米棒的最先进技术的能量低两个数量级。超低的记录能量降低了不同记录通道之间的串扰，并使得实现重写功能成为可能，从而显著提高了光数据存储的质量和容量。预计所展示的技术将促进更绿色未来的多维光数据存储的发展。
