Ito Syoji, Yamauchi Hiroaki, Tamura Mamoru, Hidaka Shimpei, Hattori Hironori, Hamada Taichi, Nishida Keisuke, Tokonami Shiho, Itoh Tamitake, Miyasaka Hiroshi, Iida Takuya
1] Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan [2] Center for Quantum Materials Science under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan [3] PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
Sci Rep. 2013 Oct 25;3:3047. doi: 10.1038/srep03047.
A highly efficient natural light-harvesting antenna has a ring-like structure consisting of dye molecules whose absorption band changes through selective evolutionary processes driven by external stimuli, i.e., sunlight depending on its territory and thermal fluctuations. Inspired by this fact, here, we experimentally and theoretically demonstrate the selective assembling of ring-like arrangements of many silver nanorods with particular shapes and orientations onto a substrate by the light-induced force of doughnut beams with different colours (wavelengths) and polarizations in conjunction with thermal fluctuations at room temperature. Furthermore, the majority of nanorods are electromagnetically coupled to form a prominent red-shifted collective mode of localized surface plasmons resonant with the wavelength of the irradiated light, where a spectral broadening also appears for the efficient broadband optical response. The discovered principle is a promising route for "bio-inspired selective optical assembly" of various nanomaterials that can be used in the wide field of nanotechnology.
一种高效的自然光捕获天线具有环状结构，该结构由染料分子组成，其吸收带通过由外部刺激（即取决于其所处区域的阳光和热波动）驱动的选择性进化过程而发生变化。受这一事实启发，在此，我们通过不同颜色（波长）和偏振的甜甜圈光束的光诱导力，结合室温下的热波动，在实验和理论上证明了许多具有特定形状和取向的银纳米棒在基板上选择性组装成环状排列。此外，大多数纳米棒通过电磁耦合形成与照射光波长共振的局域表面等离子体激元的显著红移集体模式，在此还出现了光谱展宽以实现高效的宽带光学响应。所发现的原理是各种纳米材料“受生物启发进行选择性光学组装”的一条有前景的途径，这些纳米材料可用于纳米技术的广泛领域。
