Dong Bin, Wang Peng, Liu Zhi-Bo, Chen Xu-Dong, Jiang Wen-Shuai, Xin Wei, Xing Fei, Tian Jian-Guo
Nanotechnology. 2014 Nov 14;25(45):455707. doi: 10.1088/0957-4484/25/45/455707. Epub 2014 Oct 24.
We have developed a method to tune polarization-dependent optical absorption of large-scale chemical vapor deposition (CVD) graphene under total internal reflection (TIR) by strain engineering. Through control of the strain direction, the optical absorption of graphene for transverse magnetic or transverse electric waves can be separately tuned. Strain-induced modulation of the optical absorption has been theoretically expected when light is normally incident through graphene. Under TIR, however, we experimentally observed a significant increase in the strain-induced tunability of optical absorption for CVD graphene, with the modulation efficiency of optical absorption in monolayer graphene increasing by a factor of three times that for normal incidence. We conclude that the strain sensitivity of optical absorption of graphene under TIR offers significant potential for application in many areas such as ultra-thin optical devices and strain sensors.
我们已经开发出一种方法，通过应变工程在全内反射（TIR）条件下调节大规模化学气相沉积（CVD）石墨烯的偏振相关光吸收。通过控制应变方向，可以分别调节石墨烯对横向磁波或横向电波的光吸收。当光垂直入射穿过石墨烯时，理论上预期会出现应变诱导的光吸收调制。然而，在全内反射条件下，我们通过实验观察到CVD石墨烯的应变诱导光吸收可调性显著增加，单层石墨烯中光吸收的调制效率比垂直入射时提高了两倍。我们得出结论，全内反射条件下石墨烯光吸收的应变敏感性在超薄光学器件和应变传感器等许多领域具有巨大的应用潜力。
