title: Demonstration of complex refractive index of graphene waveguide by microfiber-based Mach-Zehnder interferometer.
abstract: 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.
authors: Baicheng
authors: B
authors: Yao
authors: Yu
authors: Y
authors: Wu
authors: Zegao
authors: Z
authors: Wang
authors: Yang
authors: Y
authors: Cheng
authors: Yunjiang
authors: Y
authors: Rao
authors: Yuan
authors: Y
authors: Gong
authors: Yuanfu
authors: Y
authors: Chen
authors: Yanrong
authors: Y
authors: Li
mesh_terms: D019544:Equipment Failure Analysis / Q000295:instrumentation*; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods; D006108:Graphite / Q000737:chemistry*; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods; D008422:Materials Testing / Q000295:instrumentation*; D008904:Miniaturization; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods
chemical_list: D006108:Graphite