当前位置: X-MOL 学术Adv. Opt. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Active Thermal Control of 5 nm Gap Terahertz Antennas
Advanced Optical Materials ( IF 9 ) Pub Date : 2018-12-09 , DOI: 10.1002/adom.201800856
Hyeong Seok Yun 1 , Jeeyoon Jeong 1 , Dasom Kim 1 , Dai‐Sik Kim 1
Affiliation  

Metallic nanostructures are combined with various active materials for electrical, optical, and thermal modulations of their optical properties. In particular, for the thermal modulation, deformation of metallic nanostructures at high temperatures limits the applications to relatively low temperatures, where thermal expansion of metals is negligible. Here, a unique regime is reported where terahertz (THz) waves transmitting through 5 nm wide slot antennas can be significantly modulated via controlled thermal expansion of metals without active materials. The normalized amplitude is modulated by 20% and the resonant frequency by 22% at an elevated temperature of 150 °C, indicating a decrease in the gap width by 50%. The extreme width‐to‐length ratio of the THz slot antennas compensates the small thermal expansion coefficient of metals, enabling the gap width to be considerably changed. COMSOL simulation and coupled‐mode method (CMM) calculation quantitatively support the experimental data. This works suggests a new possibility of thermally active metallic nanostructures.

中文翻译:

5 nm间隙太赫兹天线的有源热控制

金属纳米结构与各种活性材料结合在一起,可对其光学特性进行电,光和热调制。特别地,对于热调制,金属纳米结构在高温下的变形将应用限制在相对较低的温度下,在该温度下金属的热膨胀可忽略不计。在这里,据报道有一个独特的机制,其中通过5 nm宽缝隙天线传输的太赫兹(THz)波可以通过无活性材料的金属的受控热膨胀而得到显着调制。在150°C的高温下,归一化幅度被调制20%,谐振频率被调制22%,这表明间隙宽度减小了50%。太赫兹缝隙天线的极高的长宽比弥补了金属小的热膨胀系数,使缝隙宽度大幅度改变。COMSOL仿真和耦合模式方法(CMM)计算定量地支持了实验数据。这项工作提出了一种热活性金属纳米结构的新可能性。
更新日期:2018-12-09
down
wechat
bug