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>纳米技术专栏>克里斯蒂安·舍恩>电驱动八木宇田天线,用于光

CHRIS SCHOEN
总统
Nanopartz公司

抽象:
For the first time, physicists from the University of W�rzburg have successfully converted electrical signals into photons and radiated them in specific directions using a low-footprint optical antenna that is only 800 nanometers in size. At the heart of this structure is a single CTAB-coated gold nanoparticle from Nanopartz.

2020年9月3日

电动八木天线灯

纳米天线进行数据传输
定向天线将电信号转换到无线电波,并发射它们在特定方向上,从而允许更高的性能和更少的信号的干扰。vwin徳赢官网该方案起源于无线电技术,它存在于它适应光一个大的利益,允许更高的带宽和更小的结构尺寸。毕竟,几乎所有基于互联网的通信利用可见光通信。对于光这样的天线可随后被用于几乎没有损失,并在光速单独的处理器核之间的直接交换数据。然而,为了使天线与光学的光的非常短的波长来操作,它们必须被缩小到纳米尺度。vwin徳赢官网
W�rzburg physicists have now laid the foundation for this technology in a pioneering publication: In the scientific journal "Nature Communications" they showed for the first time how to generate directed infrared light using an electrically driven Yagi-Uda antenna made of gold. The antenna was developed by the nano-optics working group of Professor Bert Hecht, who holds the Chair of Experimental Physics 5 at the University of W�rzburg. The name "Yagi-Uda" is derived from the two Japanese researchers, Hidetsugu Yagi and Shintaro Uda, who invented the antenna in the 1920s.

的八木天线的概念
什么是一个八木天线的光的样子?"Basically, it looks and works the same way as its big brothers for radio waves ," explains Dr. Ren� Kullock, a member of the nano-optics team. "There, an AC voltage is applied to a rod antenna, electrons in the metal start to oscillate and as a result electromagnetic waves are radiated in all directions. For Yagi-Uda antennas additional passive elements - the so-called reflectors and directors - are added and indirectly excited via the driving antenna." says Kullock. "This results in constructive interference in one direction and destructive interference in all other directions." Accordingly, when operated as a receiver such antennas amplify the detection of radiation from a specific direction.

金纳米粒子八木。Creating directional light: The world's first electrically powered Yagi-Uda antenna for light was built at the University of W�rzburg's Department of Physics.


过渡到光学体制
通过这个概念延伸到光体系现在面临两大挑战,研究人员:速度和大小。原则上有没有可用的交流发电机这是速度不够快,振荡光学频率和结构必须非常微小。
Fortunately, the W�rzburg physicists were already able to solve the first problem in a previous work by utilizing quantum tunneling to generate light in a single optical antenna. But in order to fabricate the relatively complex Yagi-Uda design, they had to come up with some new ideas. In the end, they succeeded thanks to a sophisticated production technique: "We bombarded gold with gallium ions which enabled us to cut out the antenna shape with all reflectors and directors as well as the necessary connecting wires from high-purity gold crystals with great precision," explains Bert Hecht.

从Nanopartz球形金纳米粒子起到至关重要的作用
在下一步骤中,物理学家有源元件位于从Nanopartz单个CTAB涂覆的金纳米颗粒。它们施加AC电压以使用介电电泳的作用,并在同一时间监视的天线作为反馈的散射光谱。颗粒被吸入,并且所述天线来生活一旦球形颗粒接触所述有源元件的一个线,同时保持到另一线只有一个纳米的CTAB介导的距离。“这个间隙很窄,使得电子可以穿过它,当使用已知作为量子隧道效应施加的电压,” Kullock解释。此概率过程产生高达光学制度与频率电荷振荡。这些激励然后通过在特定方向上天线发射 - 由于在反射器和导向元件。
然而,还有许多工作需要做新的发明之前准备在实际应用中使用。首先,物理学家必须在接收光信号的对方的工作。其次,他们必须提高效率和稳定性。

资金
这项工作是由VW-基金(批准93437)和德国研究基金会(HE 5618 / 4-1)的资助。

更多信息
Please contact Prof. Dr. Bert Hecht, Department of Physics, University of W�rzburg, Phone +49 931 31-85863,或访问

文章引用
Kullock,R.,奥克斯,M.,格林,P。等。电驱动八木宇田天线,用于光。纳特COMMUN 11,115(2020)。

Nanopartz产品用于该研究
用于该研究的产品是我们的精确球形金纳米粒子的CTAB封端剂。CTAB是提供了球形金强正电荷的胶束。该产品是在发现金纳米粒子,部件号AC11-30-CTAB-DIH-100-1及该产品的性能被发现在金纳米粒子

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