Ma Zenghong, Chen Zijian, Xu Jian, Li Weiping, Zhang Lian, Wang Lei
Basic Experimental and Training Center, Tianjin Sino-German University of Applied Sciences, Tianjin, 300350, People's Republic of China.
New Energy Department, Tianjin Sino-German University of Applied Sciences, Tianjin, 300350, People's Republic of China.
Sci Rep. 2020 Oct 9;10(1):16870. doi: 10.1038/s41598-020-73834-2.
The high confinement of surface plasmon polaritons in graphene nanostructures at infrared frequencies can enhance the light-matter interactions, which open up intriguing possibilities for the sensing. Strain sensors have attracted much attention due to their unique electromechanical properties. In this paper, a surface plasmon resonance based graphene strain sensor is presented. The considered sensing platform consists of arrays of graphene ribbons placed on a flexible substrate which enables efficient coupling of an electromagnetic field into localized surface plasmons. When the strain stretching is applied to the configuration, the localized surface plasmon resonance frequency sensitively shift. The strain is then detected by measuring the frequency shifts of the localized plasmon resonances. This provides a new optical method for graphene strain sensing. Our results show that the tensile direction is the key parameter for strain sensing. Besides, the sensitivity and the figure of merit were calculated to evaluate the performance of the proposed sensor. The calculated figure of merit can be up to two orders of magnitude, which could be potentially useful from a practical point of view.
在红外频率下，石墨烯纳米结构中表面等离激元极化子的高度限制能够增强光与物质的相互作用，这为传感带来了引人入胜的可能性。应变传感器因其独特的机电特性而备受关注。本文提出了一种基于表面等离激元共振的石墨烯应变传感器。所考虑的传感平台由放置在柔性衬底上的石墨烯带阵列组成，这使得电磁场能够有效地耦合到局域表面等离激元中。当对应变拉伸施加到该结构上时，局域表面等离激元共振频率会灵敏地发生偏移。然后通过测量局域等离激元共振的频率偏移来检测应变。这为石墨烯应变传感提供了一种新的光学方法。我们的结果表明，拉伸方向是应变传感的关键参数。此外，还计算了灵敏度和品质因数来评估所提出传感器的性能。计算得到的品质因数可达两个数量级，从实际角度来看可能具有潜在用途。
