Yao Baicheng, Wu Yu, Wang Zegao, Cheng Yang, Rao Yunjiang, Gong Yuan, Chen Yuanfu, Li Yanrong
Opt Express. 2013 Dec 2;21(24):29818-26. doi: 10.1364/OE.21.029818.
The complex refractive index (CRI) of graphene waveguide (GW) is of great importance for modeling and developing graphene-based photonic or optoelectronic devices. In this paper, the CRI of the GW is investigated theoretically and experimentally, it is found that the CRI of the GW will modulate the intensity and phase of transmitting light. The phase alterations are obtained spectrally by a Microfiber-based Mach-Zehnder interferometer (MMZI), experimental results demonstrate that the CRIs of the GW vary from 2.91-i13.92 to 3.81-i14.64 for transmitting wavelengths ranging from 1510 to 1590 nm. This method cannot only be used to determine the CRI of the GW optically and provide one of the fundamental parameters for designing graphene-based optic devices for communication and sensing applications, but also is adoptable in graphene-based transformation optics for determination of the CRI of the GW at other wavelengths.
石墨烯波导（GW）的复折射率（CRI）对于基于石墨烯的光子或光电器件的建模和开发至关重要。本文对GW的CRI进行了理论和实验研究，发现GW的CRI会调制传输光的强度和相位。通过基于微光纤的马赫-曾德尔干涉仪（MMZI）在光谱上获得相位变化，实验结果表明，对于1510至1590nm的传输波长，GW的CRI从2.91 - i13.92变化到3.81 - i14.64。该方法不仅可用于光学确定GW的CRI，并为设计用于通信和传感应用的基于石墨烯的光学器件提供基本参数之一，还可用于基于石墨烯的变换光学中以确定GW在其他波长下的CRI。
