Flexible plasmonic modulators induced by the thermomechanical effect
Flexible plasmonic modulators induced by the thermomechanical effect
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由热机械效应引起的柔性等离子体调制器
DOI：
10.1039/c9nr04068d
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发表时间：
2019
期刊：
影响因子：
6.7
通讯作者：
Jin Chongjun
中科院分区：
文献类型：
--
作者：
Zou Qiushun;Liu Wenjie;Shen Yang;Jin Chongjun
可重构等离子体柔性器件是在可拉伸基底上由人造等离子体纳米结构组成的柔性器件，在电磁波的可调谐、开关和调制等动态功能方面具有广阔的前景。在这里，我们从理论上提出并实验证明了一种简单高效的柔性等离子体调制器，该调制器基于聚二甲基硅氧烷（PDMS）衬底上的金纳米结构阵列。由于电流引起的局部焦耳热，PDMS衬底的局部膨胀使相邻金线之间的间隙距离变宽，从而导致等离子体共振的光谱位移。实验结果表明，在总功耗仅为10.5 mW的情况下，等离子体共振的蓝移达到39 nm，调制器的调制深度高达30.5%。如此低的功耗可归因于小的有源面积和优秀的热隔离PDMS。基于时域有限差分法和有限元法的电磁和热力学联合模拟证实并理解了光学和热力学响应。这种操纵光的新机制为有源光学元件和集成电路提供了新的机会。
Reconfigurable plasmon-based flexible devices, composed of artificial plasmonic nanostructures on stretchable substrates, show great promise for dynamic functionalities such as tunability, switching and modulation of electromagnetic waves. Here, we theoretically proposed and experimentally demonstrated a simple and efficient flexible plasmonic modulator based on an array of gold nanostructures on a poly(dimethylsiloxane) (PDMS) substrate. Arising from the current-induced local Joule heat, the local expansion of the PDMS substrate widens the gap distances between the neighboring gold wires, which results in a spectral shift of the plasmon resonance. The experimental results show that the plasmon resonance has a blue-shift of 39 nm under a total power consumption of only 10.5 mW, which results in a high modulation depth of up to 30.5% for the modulator. Such a low power consumption can be ascribed to the small active area and excellent thermal isolation of the PDMS. The optical and thermomechanical responses were confirmed and understood by the electromagnetic and thermomechanical co-simulations based on the finite-difference time-domain and finite-element methods. This novel mechanism to manipulate light provides new opportunities for active optical components and integrated circuits.