Open AccessDemonstration of complex refractive index of graphene waveguide by microfiber-based Mach–Zehnder interferometer
Author(s) -
Baicheng Yao,
Yu Wu,
Zegao Wang,
Cheng Yang,
Yunjiang Rao,
Yuan Gong,
Yuanfu Chen,
Yanrong Li
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.029818
Subject(s) - interferometry , optics , mach–zehnder interferometer , graphene , microfiber , refractive index , wavelength , photonics , materials science , optoelectronics , phase (matter) , waveguide , physics , nanotechnology , quantum mechanics , composite material
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.